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Copyright of African & Mediterranean Journal of Architecture & Urbanism (AMJAU) is the property of Ecole Nationale d'Architecture and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Raw milk and its derivatives are foodstuffs vulnerable to contamination by microorganisms including pathogenic bacteria and failure to comply with hygiene rules. The objective of this study was to determine the profile of pathogenic bacteria isolated from cow's milk and to evaluate the effectiveness of antibiotics commonly used in veterinary and human medicine against these bacteria in Chad. This was a prospective and analytical study based on bacteriological examination including 180 milk samples collected in 10 districts of N'Djamena, ranging from November 2021 to December 2022. The isolation, identification and testing of sensitivity of isolated bacteria to antibiotics were carried out under standard food bacteriology conditions. Among 180 milk samples which were screened by bacteriological examination, 71 (34.44%) cases were positive. The bacterial strains isolated were: Staphylococcus aureus (38.03%), Streptococcus agalactiae (18.31%), Staphylococcus hyicus (11.27%), Streptococcus uberis (7.04%), Escherichia coliO157H7 (7.04%), Streptococcus pyogenes (5.63%), Aeromonas hydrophila (5.63%), Listeria monocytogenes (4.22%) and Mycobacterium tuberculosis (2.81%). The risk factors most frequently associated with milk contamination were hand milking (100%) followed by unsanitary environment (65%), 35% of milks were sold in reused bottles and 58% of vendors and producers were uneducated. The antibiogram of the 69 isolated bacterial agents showed reduced sensitivities to beta-lactams and aminoglycosides, and varied resistance to cyclins and fluoroquinolones. Streptomycin remains an aminoglycoside most sensitive to all strains of pathogenic bacteria with an average level of 95.7%. Staphylococci (Staphylococcus aureus and Staphylococcus hyicus) developed an average resistance of 80.15% to methycillin, 80.1% to vancomycin and all bacteria showed an average resistance of 85% to metronidazole. Streptococci strains (Streptococcus agalactiae, Streptococcus uberis and Streptococcus pyogenes) were very sensitive (76.3%) to vancomycin. The isolated Listeria monocytogenes strains were 100% sensitive to aminoglycosides and beta-lactams. The two strains of Mycobacterium tuberculosis detected by GeneXpert had a profile of 50% sensitivity and 50% resistance to rifampicin. This study not only made it possible to know the high rate and frequency of pathogenic bacteria in cow's milk as well as the associated risk factors, but also showed a reduction in sensitivity of bacteria to aminopenicillins and aminoglycosides, a strong resistance of Staphylococcus aureus to methicillin and vancomycin and a high sensitivity of streptococci to vancomycin. [ABSTRACT FROM AUTHOR]

Access to safe drinking water, sanitation, and hygiene in Chad's cities, especially N'Djamena, is a persistent and significant challenge. This study aimed to assess current practices in water, sanitation, and hygiene in N'Djamena's third and ninth districts. We surveyed 395 households, conducted water source identification, and analyzed seven water samples at the National Water Laboratory. Temperature, ammonium, total coliforms, and aerobic flora values exceeded World Health Organization (WHO) guidelines. Ammonium and temperature averaged 0.7 mg/L and 30.1–31.93 °C, respectively. Bacterial contamination (>100 MPN/100 mL) exceeded the WHO's 0 MPN/100 mL guidelines, rendering the water unfit for consumption. Survey results indicate that 78.7% use hand pumps, 21.1% have tap water access, and 0.2% rely on rivers for water. Regarding toilets, 92.8% have traditional models, 2.9% have modern facilities, and 4.3% practice open defecation. 95% dispose of untreated wastewater into nature, with only 5% using septic tanks. For solid waste, 72% use illegal dumpsites, 18% rely on public services, and 10% burn waste. Finally, 95.5% of households wash their hands with clean water and soap after using the toilet. It is crucial to treat drinking water and implement proper hygiene and sanitation measures to safeguard the population's health in the studied area. HIGHLIGHTS Identification of gaps for targeted interventions.; Enhancement of public health and quality of life.; Information for more effective WASH policies and programs.; Foundation for mobilizing resources and partnerships.; Strengthening resilience in the face of water-related challenges.;

Abstract Background Group A Rotaviruses (RVA) is one of the most common causes of severe diarrhoea in infants and children under 5 years of age. Unlike many countries in the world where RVA surveillance/control is active, in Chad , there is currently no applied RVA immunization program and surveillance strategy. The present study aims to determine the prevalence and associated risk factors of RVA gastroenteritis among children under five years of age in N’Djamena. Method This study comprised two parts: (1) A cross-sectional study carried in four hospitals in N’Djamena between August and November 2019, to determine infection risk factors and evidence of RVA infection among children aged five and below, consulted or hospitalized for diarrhea. An ELISA based RVA VP6 protein detection was used to determine RVA infection prevalence. Infection results and sociodemographic data were statistically analysed to determine RVA infection risk factors. (2) A retrospective study that consisted of analysing the records of stool examinations of the period from January 2016 to December 2018, to determine the prevalence of infectious gastroenteritis among the target population. Results For the cross-sectional study, RVA infection prevalence was 12.76% (18/141) with males (61.11%) being more affected (sex ratio: 1.57). Children below 12 months were the most affected age group (44.44%) and 44.4% were malnourished. The mean Vesikari score shows that 38.8% of children have a high severity level and 41.1% have a moderate level. For the retrospective study, 2,592 cases of gastroenteritis hospitalization were analysed; 980 out of 2,592 cases (37.81%) of hospitalization due to diarrhoea were due to diarrhoeagenic pathogens including Emtamoeba hystolitica, Gardia lamblia, Trichomonas hominis, Hymenolepis nana, Escherichia coli, Shigella spp, Proteus mirabilis, and Klebsiella oxytoca. Cases of diarrhoea with negative pathogen search were 1,612 cases (62.19%). The diarrhoea peak was observed during the dry seasons, and the age group under 11 months was the most affected was (57.3%). Conclusion This study describes the evidence of RVA infection among diarrhoeic children below five years of age in N’Djamena, thus indicates a serious health burden. Malnourishment younger age was the higher risk factor. Further studies are needed to determine the circulating strains prior to considering introduction of RVA vaccine and setup a routine rotavirus surveillance in Chad.

Access to safe drinking water, sanitation, and hygiene in Chad's cities, especially N'Djamena, is a persistent and significant challenge. This study aimed to assess current practices in water, sanitation, and hygiene in N'Djamena's third and ninth districts. We surveyed 395 households, conducted water source identification, and analyzed seven water samples at the National Water Laboratory. Temperature, ammonium, total coliforms, and aerobic flora values exceeded World Health Organization (WHO) guidelines. Ammonium and temperature averaged 0.7 mg/L and 30.1-31.93 °C, respectively. Bacterial contamination (>100 MPN/100 mL) exceeded the WHO's 0 MPN/100 mL guidelines, rendering the water unfit for consumption. Survey results indicate that 78.7% use hand pumps, 21.1% have tap water access, and 0.2% rely on rivers for water. Regarding toilets, 92.8% have traditional models, 2.9% have modern facilities, and 4.3% practice open defecation. 95% dispose of untreated wastewater into nature, with only 5% using septic tanks. For solid waste, 72% use illegal dumpsites, 18% rely on public services, and 10% burn waste. Finally, 95.5% of households wash their hands with clean water and soap after using the toilet. It is crucial to treat drinking water and implement proper hygiene and sanitation measures to safeguard the population's health in the studied area. [ABSTRACT FROM AUTHOR]

Background: Group A Rotaviruses (RVA) is one of the most common causes of severe diarrhoea in infants and children under 5 years of age. Unlike many countries in the world where RVA surveillance/control is active, in Chad , there is currently no applied RVA immunization program and surveillance strategy. The present study aims to determine the prevalence and associated risk factors of RVA gastroenteritis among children under five years of age in N'Djamena. Method: This study comprised two parts: (1) A cross-sectional study carried in four hospitals in N'Djamena between August and November 2019, to determine infection risk factors and evidence of RVA infection among children aged five and below, consulted or hospitalized for diarrhea. An ELISA based RVA VP6 protein detection was used to determine RVA infection prevalence. Infection results and sociodemographic data were statistically analysed to determine RVA infection risk factors. (2) A retrospective study that consisted of analysing the records of stool examinations of the period from January 2016 to December 2018, to determine the prevalence of infectious gastroenteritis among the target population. Results: For the cross-sectional study, RVA infection prevalence was 12.76% (18/141) with males (61.11%) being more affected (sex ratio: 1.57). Children below 12 months were the most affected age group (44.44%) and 44.4% were malnourished. The mean Vesikari score shows that 38.8% of children have a high severity level and 41.1% have a moderate level. For the retrospective study, 2,592 cases of gastroenteritis hospitalization were analysed; 980 out of 2,592 cases (37.81%) of hospitalization due to diarrhoea were due to diarrhoeagenic pathogens including Emtamoeba hystolitica, Gardia lamblia, Trichomonas hominis, Hymenolepis nana, Escherichia coli, Shigella spp, Proteus mirabilis, and Klebsiella oxytoca. Cases of diarrhoea with negative pathogen search were 1,612 cases (62.19%). The diarrhoea peak was observed during the dry seasons, and the age group under 11 months was the most affected was (57.3%). Conclusion: This study describes the evidence of RVA infection among diarrhoeic children below five years of age in N'Djamena, thus indicates a serious health burden. Malnourishment younger age was the higher risk factor. Further studies are needed to determine the circulating strains prior to considering introduction of RVA vaccine and setup a routine rotavirus surveillance in Chad. [ABSTRACT FROM AUTHOR]

Introduction: Neutralizing antibodies (NAbs) are an important specific defence against viral infections, as these antibodies bind to specific receptor(s) and block the viral entry. NAbs assessments are therefore useful in determining individual or herd immunity to SARS‐CoV‐2. This study aims to deepen the investigation by assessing the positivity rate of neutralizing anti‐spike antibodies to understand the real protection of the studied population against SARS‐CoV‐2. Methods: This study involved 260 plasma samples from a larger cohort of 2,700 asymptomatic volunteer donors, enrolled between August and October 2021 in health facilities of N'Djamena. In this study four different kits and techniques including the pseudotype assay have been used and compared with detect the SARS‐CoV‐2 antibodies. Pseudotyped vesicular stomatitis virus (VSV), was used both the identify and measure the NAbs that to evaluate the performance of two cheaper and easy to use commercial kits, specific for the detection of receptor‐binding domain antibodies (anti‐RBD) against the SARS‐CoV‐2 spike protein. Results: The VSV spike neutralization assay showed that 59.0% (n = 59) samples were positive for NAbs with titers ranging from 1:10 to 1:4800. While 23 out the 41 negative NAbs samples were detected positive using anti‐RBD (Abbott) test. Furthermore, a direct and significant strong correlation was found between NAbs and anti‐RBD, specifically with Abbott kit. Taken together, the Roche and Abbott methods indicated agreement at the high concentrations of antibodies with the VSV‐pseudovirus method. Abbott and Roche indicated a good sensitivity, but the Abbott system test appeared to have better specificity than the Roche test. Conclusion: Our findings indicated a high presence of NAbs against SARS‐CoV‐2 spike protein among asymptomatic individuals in N'Djamena. This could be one of the reasons for the low severity of Covid‐19 observed in this area, given the key role of NAbs in blocking SARS‐CoV‐2 infection. [ABSTRACT FROM AUTHOR]

Climate variability and change are already having a negative impact on the health of tens of millions of Africans through exposure to sub-optimal temperatures and extreme weather conditions as well as increasing the range and transmission of infectious diseases. This study aims to identify climate risks and the vulnerability of health systems as well as individual coping strategies in the city of N'Djaména. To achieve this, we adopted a methodology combining both quantitative and qualitative approaches. Meteorological data on wind, temperature, and rainfall were collected at daily and monthly intervals from the National Meteorological Agency in N'Djaména. Qualitative data were collected via focus group discussions with targets of the city's health system and quantitative data were collected from the population on the basis of oriented questionnaires. The results show that rising temperatures with heat waves, regular flooding, and strong winds are the major climate risks identified. These have numerous impacts and effects on the city's health system due to the following vulnerability factors most recognized by city dwellers: insufficient medical equipment in health facilities (IEME), the fragile nature of people's physiological state in the face of climatic risks (CFEP), and the failure of city sanitation strategies and policies (DSPA). This study proposes a set of recommendations for transformational adaptation of the healthcare sector, which remains vulnerable to climate risks. [ABSTRACT FROM AUTHOR]

Abstract Introduction Neutralizing antibodies (NAbs) are an important specific defence against viral infections, as these antibodies bind to specific receptor(s) and block the viral entry. NAbs assessments are therefore useful in determining individual or herd immunity to SARS‐CoV‐2. This study aims to deepen the investigation by assessing the positivity rate of neutralizing anti‐spike antibodies to understand the real protection of the studied population against SARS‐CoV‐2. Methods This study involved 260 plasma samples from a larger cohort of 2,700 asymptomatic volunteer donors, enrolled between August and October 2021 in health facilities of N'Djamena. In this study four different kits and techniques including the pseudotype assay have been used and compared with detect the SARS‐CoV‐2 antibodies. Pseudotyped vesicular stomatitis virus (VSV), was used both the identify and measure the NAbs that to evaluate the performance of two cheaper and easy to use commercial kits, specific for the detection of receptor‐binding domain antibodies (anti‐RBD) against the SARS‐CoV‐2 spike protein. Results The VSV spike neutralization assay showed that 59.0% (n = 59) samples were positive for NAbs with titers ranging from 1:10 to 1:4800. While 23 out the 41 negative NAbs samples were detected positive using anti‐RBD (Abbott) test. Furthermore, a direct and significant strong correlation was found between NAbs and anti‐RBD, specifically with Abbott kit. Taken together, the Roche and Abbott methods indicated agreement at the high concentrations of antibodies with the VSV‐pseudovirus method. Abbott and Roche indicated a good sensitivity, but the Abbott system test appeared to have better specificity than the Roche test. Conclusion Our findings indicated a high presence of NAbs against SARS‐CoV‐2 spike protein among asymptomatic individuals in N'Djamena. This could be one of the reasons for the low severity of Covid‐19 observed in this area, given the key role of NAbs in blocking SARS‐CoV‐2 infection.

Copyright of Akofena is the property of Universite Felix Houphouet Boigny and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Climate variability and change are already having a negative impact on the health of tens of millions of Africans through exposure to sub-optimal temperatures and extreme weather conditions as well as increasing the range and transmission of infectious diseases. This study aims to identify climate risks and the vulnerability of health systems as well as individual coping strategies in the city of N’Djaména. To achieve this, we adopted a methodology combining both quantitative and qualitative approaches. Meteorological data on wind, temperature, and rainfall were collected at daily and monthly intervals from the National Meteorological Agency in N’Djaména. Qualitative data were collected via focus group discussions with targets of the city’s health system and quantitative data were collected from the population on the basis of oriented questionnaires. The results show that rising temperatures with heat waves, regular flooding, and strong winds are the major climate risks identified. These have numerous impacts and effects on the city’s health system due to the following vulnerability factors most recognized by city dwellers: insufficient medical equipment in health facilities (IEME), the fragile nature of people’s physiological state in the face of climatic risks (CFEP), and the failure of city sanitation strategies and policies (DSPA). This study proposes a set of recommendations for transformational adaptation of the healthcare sector, which remains vulnerable to climate risks.

Background. Since the start of the COVID-19 pandemic, Chad has had 7,417 confirmed cases and 193 deaths, one of the lowest in Africa. Objective. This study assessed SARS-CoV-2 immunity in N’Djamena. Methods. In August-October 2021, eleven N’Djamena hospitals collected outpatient data and samples. IgG antibodies against SARSCoV- 2 nucleocapsid protein were identified using ELISA. “Bambino Gesù” Laboratory, Rome, Italy, performed external quality control with chemiluminescence assay. Results. 25-34-year-old (35.2%) made up the largest age group at 31.9 12.6 years. 56.4% were women, 1.3 women/men. The 7th district had 22.5% and the 1st 22.3%. Housewives and students dominated. Overall seroprevalence was 69.5% (95% CI: 67.7-71.3), females 68.2% (65.8-70.5) and males 71.2% (68.6-73.8). 44-year-old had 73.9% seroprevalence. Under-15s were 57.4% positive. Housewives (70.9%), civil servants (71.5%), and health workers (9.7%) had the highest antibody positivity. N’Djamena’s 9th district had 73.1% optimism and the 3rd district had 52.5%. Seroprevalences were highest at Good Samaritan Hospital (75.4%) and National General Referral Hospital (74.7%). Conclusion. Our findings indicate a high circulation of SARSCoV- 2 in N’Djamena, despite low mortality and morbidity after the first two COVID-19 pandemic waves. This high seroprevalence must be considered in Chad’s vaccine policy.

La révolution numérique offre de nouvelles possibilités de transferts d’argent avec l’intégration d’acteurs longtemps exclus des circuits financiers ordinaires. Pour appréhender les bouleversements que son adoption a provoqué dans les pratiques socioéconomiques au sein de la population tchadienne, une enquête qualitative a été réalisée auprès de quatorze (14) personnes à travers l’observation directe et l’entretien. Les résultats obtenus portent sur les perceptions de la monnaie électronique et les pratiques des transferts d’argent par téléphone mobile à N’Djaména.

In most countries, sex-work is criminalized and frowned upon. This leads to human rights abuses, especially for migrant female sex workers. The burden is heavier on migrant female sex-workers whose gender and foreign citizenship intersect to produce a plethora of adverse health, social, and legal outcomes. This phenomenological study explores the intersectionality of individual factors leading to human rights abuses among migrant Cameroonian female sex workers in N'Djamena, Chad. Ten female sex workers and two key-informants were interviewed, and being a small sample, they gave detailed information about their experiences. The data was later analyzed using thematic analysis. Participants narrated experiences of social exclusion, exposure to diverse abuses, and health risks due to gender, immigrant status, and illegality of sex work. The experiences of female migrant sex workers, within contexts of sex work criminalization, are exacerbated by the intersectionality of these factors. Women endure several vulnerabilities in many African countries, more so when they have to survive on sex work as foreigners in a country where the act is illegal. [ABSTRACT FROM AUTHOR]

Introduction : La tuberculose ganglionnaire représente la localisation extra pulmonaire la plus rencontrée. Elle pose un véritable problème diagnostic, thérapeutique et esthétique malgré l’efficacité actuelle de la chimiothérapie anti bacillaire. L’objectif de notre étude était d’analyser les aspects épidémiologiques, cliniques, thérapeutiques et évolutifs de la tuberculose ganglionnaire afin d’améliorer sa prise en charge. Patients et méthodes : il s’agissait d’une étude descriptive rétrospective sur une période de 2 ans allant d’Avril 2015 à Mars 2017 au CHU-RN portant sur 40 patients. Etaient inclus dans notre étude tous les patients atteints. Les variables étudiées étaient sociodémographiques, cliniques, paracliniques, thérapeutiques et évolutives. Résultats : L’âge moyen était de 32 ans, avec un sexe ratio de 1,1 en faveur des femmes. La localisation cervicale était prédominante avec 67,5% des cas. Il a été noté dans 52,5% des cas une notion de contage tuberculeux. Le diagnostic histologique était noté dans 97% des cas. L’atteinte pulmonaire concomitante était rapportée dans 20% des cas. Une coïnfection rétrovirale HIV était retrouvée dans 30% des cas. Le traitement anti bacillaire était instauré chez tous nos patients. Seuls les cas d’échec thérapeutique (20%) et de rechute (10%) avaient bénéficié de traitement chirurgical. L’évolution était favorable dans 65%. Conclusion : Le diagnostic de la tuberculose ganglionnaire est souvent retenu sur les données anatomopathologiques. La prise en charge nécessite parfois une intervention chirurgicale

Introduction: Peritoneal tuberculosis is not uncommon in Chad. Its diagnosis of certainty is difficult and is based on the analysis of ascites fluid and abdominal ultrasound. Our aim was to contribute to the study of the various clinical, diagnostic and progressive aspects of peritoneal tuberculosis in the internal medicine department of the HGRN. Methodology: This is a retrospective and prospective study spread over 39 months covering the period from January 2014 to March 2017 including all patients hospitalized for peritoneal tuberculosis in the internal medicine department of the HGRN. The diagnosis was made, on a bundle of anamnestic, clinical, ultrasound, cytological and evolutionary arguments. Results: During the study period, 69 patients were included, or 9.77% of all hospital admissions. The average age was 42 years (range 18 to 83 years). The female sex represented 52.2% of the cases. The main reasons for hospitalization were ascites (87% of cases), associated with fever (92.5% of cases). The clinical signs were dominated by abdominal pain, deterioration of general condition and transit disorders. The ascites fluid was citrus yellow, rich in lymphocytes (81.6% of cases) and protein (94.2% of cases). Abdominal ultrasound, performed in all patients, demonstrated ascites with deep, mesenteric lymphadenopathy, portal in 62.3% of cases and compartmentalized in 37.7% of cases. Tuberculosis treatment was started in all patients and the outcome was favorable in 65.2% of cases. We deplored 20.3% mortality; all were patients who were severely immunosuppressed with HIV. Conclusion: Peritoneal involvement in tuberculosis is common in Chad. The diagnosis is not always easy, but the clinic associated with the exudative and lymphocytic characters of the ascites fluid as well as the abdominal ultrasound are elements which can direct towards a peritoneal localization of tuberculosis. The course is generally favorable under early treatment and well conducted. [ABSTRACT FROM AUTHOR]

Copyright of Journal of Al-Frahids Arts is the property of Republic of Iraq Ministry of Higher Education & Scientific Research (MOHESR) and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

The urban groundwater of the Quaternary aquifer of the Lake Chad basin in N'Djamena has been subject to many hydrochemical studies. However, the results are often not presented in a way that enables water quality managers to make an appropriate decisions, which restrict development and poverty reduction efforts. The objective of the present study was to contribute the improved management of the local groundwater resources. A total of 85 groundwater samples were interpreted using hydrochemical techniques associated with integrated numerical indices and multivariate statistical analysis. The hydrochemical results coupled with the relative residence time of water have shown that the chemical composition of these waters is linked to geogenic and anthropogenic factors and to their proximity to the Chari-Logone rivers. These investigations showed that the groundwater quality in N'Djamena is characterized by a high spatial variability. This study also assessed the suitability of groundwater for user needs and identified areas which are more/less favorable for a specific use. The evaluation of water quality and its suitability for human consumption is also a problem of optimizing data acquisition strategy, and this study used the correlation between water quality index (WQI) and electrical conductivity (EC) to orientate future data acquisition strategies. This parametrization can assist the decision makers and water management professionals in evaluating groundwater availability and setting up a robust water quality management plan in areas with similar hydrogeological and climatic conditions. [ABSTRACT FROM AUTHOR]

This study aims to estimate some of the physical properties of drinking water distributed by the Chadian Water Company (STE) to the residents of N'Djamena through its various reservoirs and networks, then comparing the percentages of these standards with the permissible limits according to the specifications of international bodies and organizations concerned with health and environment. These properties are: EC:Electrical Conductivity)µs/cm(,pH, TDS: Total Dissolved Solids(mg/l), T: Temperature )C°, DO :Dissolved Oxygen. Water samples were collected before treatment (directly from the artesian well) and after treatment (from the water distribution network) from three stations of the Chadian Water Company (STE): GD1 (Gendarmerie), GD24 (Centre STE). 2Ch.jumelles (Châteaux Rue 40). The physical properties of these samples were determined in the laboratory of the Chadian Water Company according to the approved standard methods. The results of the analyzes for various properties were compared with the permissible values and limits of the World Health Organization and some health and environmental bodies and institutions. this study Was Conducted from February to March 2021. All the measurements made were repeated three times, then each result was expressed as the mean value plus or minus the standard deviation. The statistical analysis program Recomander (R×643.2.2.5.Lnk) was used to perform the statistical analyzes of the results, and the confidence level for these results was taken at P<0.05. [ABSTRACT FROM AUTHOR]

Around the world, with a significant increase in installed capacity each year, wind power is one of the most profitable forms of renewable energy. In this study, three commercial wind turbines, namely Bonus 300kW/33, Bonus 1MW/54 and Vestas 2MW/80, were selected as large-scale wind power conversion systems (WECS) for the technical evaluation of production electricity for the N'Djamena site in Chad. The economic evaluations of these three WECS for power generation are calculated using the Cost Calculation Technique (PVC). Thus, the results obtained show that the highest capacity factor is 15.29% with Bonus 1MW/54 while the lowest at 11.39% with Bonus 300kW/33. The minimum average cost per kWh is 23 US$ / kWh with the 1 MW/54 Bonus, while the highest cost is 33.8 US$ / kWh with a Bonus of 300 kW / 33.

Background: Dental caries is a global disease that can have disabling effects. In Africa, its prevalence in schools is very variable, due to the great variability of food habits and oral hygiene. This study aimed to assess the prevalence of dental caries, associated factors, and to research oral pathologies associated with that dental decay in one circumscription of the city of N'Djamena., Material and Methods: This was a cross-sectional study conducted in 3 schools in the 7th borough of the city of N'Djamena. A total of 360 pupils aged between 6 and 12 years were recruited between October 2021 and September 2022. Each participant underwent to an oral examination which consisted in looking carefully at the pupil's face (cheeks, lips) to note any deformities or possible facial asymmetry, and to check for any sensation of pain in any part of the face. In another hand, the oral examination aimed to look for any decay on all the teeth and determine the category and class of it. Finally, the personal data (age, sex, class, parents' occupations) of each participant and the results of his oral examination were collected into a database and analyzed., Results: A total of 185 pupils had at least one decayed tooth, giving a prevalence rate of 51.4%. Among them, 45% had at least 2 decayed teeth. The school attended and snacking between meals were significantly associated with the presence of caries (p<0.05). Teeth 36 (lower left first molar) and 46 (lower right first molar) were the most often affected by caries (21% and 22% respectively). The mixt DMF index was 0.6 and the overall frequency of decayed teeth was 51.9%. According to Black's classification, class II caries was the most prevalent (48%), while according to Baume's classification, category II was the most prevalent (54%). The time of brushing, the material and the type of product used significantly influenced the appearance of caries (p<0.05). Participants with dental dyschromia had more tooth decay., Conclusion: Caries was prevalent in the targeted schools and represented a real problem for pupils. Implementing an oral health policy based on preventive dentistry by raising awareness among children and their parents would contribute to the proper education of pupils., (Copyright © 2024 SFMTSI.)

The objectives of this study were to determine some Physical and chemical properties of wastewater in N’Djamena city in Chad and to evaluate their impact on the environment. The Chemical parameters including dissolved oxygen and turbidity, Pb, As, Cd, Ni, and Cr. This study also aims to identify the health risks resulting from increasing concentrations (of these minerals). Samples were collected from four different sites and analyzed according to standard methods. The results showed that the values of most parameters are beyond the World Health Organization recommended for wastewater discharge. Intensive investigations were recommended to cover the analysis of some chemical properties such as: SO4-2, NO2-, Cl- and microbiological parameters, for better assessment the degree of pollution. [ABSTRACT FROM AUTHOR]

The present article examines two clubs for music lovers in N’Djamena, the Guest Star Club and the AJRA collective. Way beyond the strictly cultural and artistic context, these two structures also generate sharing and exchange about other fields of interest concerning life choices related to the passage from adolescence to adulthood.These structures are short-lived and therefore impermanent, all the more so because their members do not seem to consider membership as a permanent feature in their lives. Yet a closer examination of the internal practices in such structures reveals a completely different aspect: they are likely to function along lines similar to the formal rules of other established organisations, which in turn tends to blur or question the limits of their impermanence.Analysis of the social codes within these structures shows they are either at odds or in harmony with life in society and, as such, may be considered as part of the “ways of living together” in an African town currently undergoing considerable change.

Copyright of Cahiers d'Études Africaines is the property of Editions EHESS and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Médecine et Santé Tropicales is the property of John Libbey Eurotext Ltd. and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Introduction: Diabetes mellitus is a real health problem and its complications affect many organs including the kidneys. Early diagnosis of diabetic nephropathy allows to treat patients more effectively and with a multidisciplinary approach, to slow its progression in chronic renal failure. Few studies have been conducted in Africa in this field of study. In Chad, we have no statistics on renal disease related to diabetes. That is why we propose to study diabetic nephropathy with the aim of analyzing the profile of diabetic nephropathy in patients at the National Reference General Hospital of N'Djamena (CHAD). Methods: We conducted a descriptive cross-sectional study at the National Reference General Hospital in N'Djamena from April to September 2012. All patients with diabetes hospitalized or treated in the department of nephrology and endocrinology were included in the study. Results: There were 54 cases of diabetic nephropathy out of a total of 181 patients (29.80%). The patients over the age of 50 years accounted for 87%, masculine gender dominated (67%), diabetes' progression time at the moment of nephropathy discovery was 10.25 years, mean blood pressure was 138 mm Hg, HbA1c was greater than 6.5% in 74.5%, end-stage renal disease (ESRD) was found in 26.90%, proteinuria 2.65 g / 24 h was found in 60.30%. 57.4% of patients had stage III diabetic retinopathy. Conclusion: In Chad, the frequency of diabetic nephropathy is approximately 29.83%. This is a condition that affects men with an average age of 58.7 years. Type 2 diabetes is the most common (90.7% of cases). Poorly controlled risk factors might lead to diabetic nephropathy progression in impaired renal function, namely hypertension (70.8%), in glycemic control (66.7%) and in proteinuria (62.5%). [ABSTRACT FROM AUTHOR]

Objective To estimate the annual human rabies incidence as a baseline prior to mass dog vaccination campaigns in N'Djaména, Chad. Methods Survey of animal bites, involving 50% of all healthcare providers in N'Djaména, from September 2008 to April 2009. Of 86 people exposed to a suspected rabid animal, 50% received post-exposure vaccination and a further 8% had their wound cleaned. We estimated annual incidence of bites from suspected rabid animals of 12.9/100 000 and an incidence of 0.7 human rabies deaths/100 000, resulting in 7 estimated deaths (95% confidence interval 4-10 deaths) per year in N'Djaména. 14% of bite victims sought help from veterinarians. Conclusions Closer cooperation between physicians and veterinarians warrants more effective rabies control. The high proportion (42%) of potentially exposed people without post-exposure vaccination or wound treatment necessitates urgent attention. [ABSTRACT FROM AUTHOR]

In the discussion about policies and strategies for rabies prevention in developing countries, intervention costs arise as a major issue. In a pilot mass vaccination campaign against rabies in N'Djaména, Chad, 3000 dogs were vaccinated. We assessed vaccination coverage and cost, showing the cost per dog vaccinated for the public sector and for society. An extrapolation to city level calculated the approximate cost of vaccinating all 23 600 dogs in N'Djaména. In the pilot mass campaign with 3000 dogs the average cost per dog was 1.69 €. to the public and the full societal cost was 2.45 €. If all 23 600 dogs in N'Djaména were vaccinated, the average cost would fall to 1.16 € to the public and 1.93 € to society. Private sector costs account for 31% of the cost to vaccinate 3000 dogs, and 40% of the cost to vaccinate 23 600 dogs. Mass dog vaccination could be a comparatively cheap and ethical way to both control the disease in animals and prevent human cases and exposure, especially in developing countries. The cost-effectiveness of dog vaccination compared with treating victims of dog bites for prevention of human rabies should be further assessed and documented. [ABSTRACT FROM AUTHOR]

This work describes for the first time the incidence risk of passively reported canine rabies, and quantifies reported human exposure in N’Djame´na (the capital of Chad). To diagnose rabies, we used a direct immunofluorescent-antibody test (IFAT). From January 2001 to March 2002, we were brought 34 rabies cases in dogs and three cases in cats. Canine cases were geographically clustered. The annual incidence risk of canine rabies was 1.4 (95% CI: 1.2, 1.7) per 1000 unvaccinated dogs. Most of the rabid dogs were owned—although free-roaming and not vaccinated against rabies. Most showed increased aggressiveness and attacked people without being provoked. Eighty-one persons were exposed to rabid dogs and four persons to rabid cats (mostly children<15 years old). Most of the exposed persons were neighbours or family members of the animal owner. Most exposures were transdermal bites, but nearly half of all exposed persons did not apply any first wound care or only applied a traditional treatment. In N’Djame´na, humans are often exposed to canine rabies but do not use the full-course post-exposure treatment and wound care is insufficient. Most rabid dogs would be accessible to parenteral vaccination. Pilot vaccination campaigns are needed to determine the success of dog mass vaccination in N’Djame´na as a way to prevent animal and human rabies. [Copyright &y& Elsevier]

Introduction: Traditional treatment of limb trauma by traditional healers is ubiquitous in Sub-Saharan Africa. These practices are the source of many complications. This study aims to clarify the profile of these complications and to identify the factors favoring the consultation of traditional healers., Material and Methods: Descriptive and analytical study over 12 months, from February 1, 2018 to January 31, 2019, covering all the patients who consulted at the surgery department of the CHU Le Bon Samaritain in N'Djamena (CHUBS) for a complication of a fracture or dislocation of a limb treated by a traditional healer. Data collection was carried out using a pre-established questionnaire with an average follow-up of 14 months., Results: Out of 144 patients, 47 (33%) suffered from at least one complication of fracture or dislocation following traditional treatment. Thirty-two were included in the survey. Their mean age was 23 years (range 10-61) and the sex ratio 2.6 in favor of men. The origin was mainly rural: pupils/students and farmers/breeders were the most represented. We identified individuals from all levels of education, mainly primary level. Road accidents were the most frequent (n = 20). The influence of the entourage (n = 14) was the first factor leading to the choice of traditional treatment. The wooden splint, which did not immobilize the proximal fracture joints, associated with the ischemic bandage causing the gangrene, was the first means of restraint (n = 15). The mean time between trauma and the start of traditional treatment was 8.5 hours. The mean time from traditional treatment to onset of complications was 106 days (range 1-302). The most common complications were swelling of the limbs, malunions, gangrene and pseudarthrosis. The initial lesion was a closed fracture in most cases (n = 22) with a predominance of the pelvic limbs (n = 22). Hospital management was surgical (n = 19) or orthopedic (n = 13). Therapeutic progress has been good, fairly good or bad regarding 24, 2 and 6 cases respectively.The solicitation of traditional healers is frequent in traumatology. The influence of social background and ease of access to traditional "doctors" were noted as determining factors in the choice of this kind of treatment. The consequences of this practice have various origin: insufficient immobilization not respecting the standards; intense and untimely massages causing severe pain, secondary displacements and abnormal consolidation. Another study extended to patients who satisfied or not with the result of traditional fracture treatment in addition to those who consulted for complications would be more representative., Conclusion: The complications of traditional treatments for traumatic limb injuries are serious. The training of the traditional healers on basic notions of immobilization and the recognition of signs of seriousness, their collaboration with health structures as well as free care in hospital services would make possible to reduce this phenomenon. The media and social networks should help to reach a large audience., (Copyright © 2022 SFMTSI.)

Introduction: Peritoneal tuberculosis is not uncommon in Chad. Its diagnosis of certainty is difficult and is based on the analysis of ascites fluid and abdominal ultrasound. Our aim was to contribute to the study of the various clinical, diagnostic and progressive aspects of peritoneal tuberculosis in the internal medicine department of the HGRN., Methodology: This is a retrospective and prospective study spread over 39 months covering the period from January 2014 to March 2017 including all patients hospitalized for peritoneal tuberculosis in the internal medicine department of the HGRN. The diagnosis was made, on a bundle of anamnestic, clinical, ultrasound, cytological and evolutionary arguments., Results: During the study period, 69 patients were included, or 9.77% of all hospital admissions. The average age was 42 years (range 18 to 83 years). The female sex represented 52.2% of the cases. The main reasons for hospitalization were ascites (87% of cases), associated with fever (92.5% of cases). The clinical signs were dominated by abdominal pain, deterioration of general condition and transit disorders. The ascites fluid was citrus yellow, rich in lymphocytes (81.6% of cases) and protein (94.2% of cases). Abdominal ultrasound, performed in all patients, demonstrated ascites with deep, mesenteric lymphadenopathy, portal in 62.3% of cases and compartmentalized in 37.7% of cases. Tuberculosis treatment was started in all patients and the outcome was favorable in 65.2% of cases. We deplored 20.3% mortality; all were patients who were severely immunosuppressed with HIV., Conclusion: Peritoneal involvement in tuberculosis is common in Chad. The diagnosis is not always easy, but the clinic associated with the exudative and lymphocytic characters of the ascites fluid as well as the abdominal ultrasound are elements which can direct towards a peritoneal localization of tuberculosis. The course is generally favorable under early treatment and well conducted., (Le comité de rédaction se réserve le droit de renvoyer aux auteurs avant toute soumission à l'avis des lecteurs les manuscrits qui ne seraient pas conformes à ces modalités de présentation. En outre il leur conseille de conserver un exemplaire du manuscrit, des figures et des tableaux.)

Objective: The aim of this study was to assess the commonly accepted potential effects of Artemisinin-based combinaison therapy (ACT) on repolarization and QT., Method: We realized a retrospective study, evaluating epidemiologic, clinical, biological and electrocardiographic data for patients treated for falciparum malaria, between August 31 st and November 3 rd , 2017 in the Pôle de santé unique on the Camp Kosseï of N'Djamena., Results: One hundred and four patients were included (28,6 years old [0 - 75 years], 72% male). All had fever (38,4 °C [36,6 - 41,5 °C]), asthenia, and main symptoms were headache and arthromyalgia (58%). No significant difference was noted after treatment concerning biological data (especially kaliemia: 3.81 versus 3.91 mmol/l, p = 0.154). There was no significant increase of QTc (415.8 versus 421.4 ms, p = 0.89) with the two ACT treatment used and no adverse events., Discussion: Population is essentially composed of Chadian men, often partly immunized, that can modify clinical presentation. French soldiers' medical follow up in military operations decreases contra-indications of ACT., Conclusions: These results are in favor of a good cardiac tolerance of ACT with piperaquine and it should be proposed not to realize systematic ECG for the French soldiers in external operation when treated with ACT., (Copyright © 2021 SFMTSI.)