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BACKGROUND: With the ageing population in China and an increasing number of the elderly developing chronic illnesses, health services for the elderly have become a major concern. They have significant needs for health information (HI) such as online medical consultation, disease prevention, and medical insurance. OBJECTIVE: To explore the influencing factors and their relative significance in proxy online health information (OHI) seeking among the elderly with chronic illnesses so as to provide a reference for enriching theoretical research and optimizing care for the elderly with chronic illness. METHODS: Twenty-three elderly people with chronic illnesses participated in semi-structured in-depth interviews in this study. The interview transcripts were subject to three levels of coding (open, axial, and selective coding) based on grounded theory to determine the factors influencing proxy OHI seeking among the elderly and to understand how the main categories are interconnected. We used the interpretive structural modeling (ISM) process to analyze the hierarchy and associated pathways among the factors influencing proxy OHI seeking. RESULTS: From our analysis, we identified four main categories affecting proxy HI seeking: the health status, emotional needs, electronic HI literacy, and self-efficacy of the elderly. There were six subcategories that could be further subclassified into direct factors, key factors, and root factors, which constituted the hierarchical model of influencing factors. CONCLUSION: We found that proxy HI seeking among the elderly was directly triggered by self-efficacy and emotional needs following changes in their evaluation of health information and emotional needs, which originates from their perceptions of their health, concerns about their health, and information retrieval capability. [ABSTRACT FROM AUTHOR]

To analyze changes of hepatitis A antibody levels and immunization coverage of HAV vaccine among children before and after implementing the Expanded National Immunization Program in five counties of China, and to provide evidence for developing hepatitis A vaccine immunization strategies. 449 children born in 2001, 2005 and 2009 were selected from five counties for an immunization coverage and a sero-prevalence survey of hepatitis A. The chemiluminescence microparticle immunoassays (CMIA) were used to detect hepatitis A IgG antibody and analyzed the factors which influenced the immunization coverage and positive rates. Among 449 subjects of children born in 2001, 2005 and 2009, the immunization coverage were 53.02%, 78.52% and 99.34% (χ2 = 91.285, P < 0.001). The positivity rates of hepatitis A IgG antibody were 61.07%, 81.21%, 95.36% (χ2 = 54.198, P < 0.001), respectively. The immunization coverage and positivity rate significantly increased with the delay of birth year. Children accepting different doses of HA vaccines are significantly different in positive rates of HA antibody, while there are no significant differences of different genders, years of birth, residence types, or types of registered permanent residence in different regions. The positivity rate increased significantly with administration of hepatitis A vaccine and shorter intervals between sample collection and HAV immunization. After the Expanded National Immunization Program was implemented, hepatitis A antibody levels were significantly increased in five counties, which indicates a successful result of EPI. [ABSTRACT FROM AUTHOR]

To identify measles vaccine failures in Tianjin, China using a measles virus IgG avidity assay. The China Information System for Disease Control and Prevention (CISDCP) was used to collect information about measles cases and blood specimens in Tianjin from 2013 to 2015. Measles-specific IgM and IgG antibodies were detected using Enzyme-Linked Immunosorbent Assay (ELISA). Avidity testing for measles IgG was performed using a commercial enzyme immunoassay (EIA). A total of 284 confirmed measles cases were identified. Of this total, 262 (92.25%) were in patients aged ≥ 20 years. High avidity was exhibited in 172 (60.56%) cases, while 80 (28.17%) cases demonstrated low avidity. High avidity was detected in only 21.43% of cases in patients aged < 1 year. The proportion of high avidity increased with age, and was significantly higher in patients aged 30–39 years at 70.07% (χ 2 = 17.27, P = 0.002). Of the 52 measles cases in patients with a history of vaccinations, 41 (78.85%) cases showed high avidity, indicating secondary vaccine failures (SVF). In these vaccinations, there was no significant difference (P > 0.05) in clinical severity between high avidity and low avidity cases. However, regardless of vaccination status, clinical severity was significantly lower in high avidity cases (P < 0.001) than in low avidity cases. The percentages of positive measles IgM results in high avidity and low avidity cases were 66.28% and 91.25%, respectively. Geometric Mean Concentration (GMC) was significantly lower in high avidity cases at 33.73 U/mL, compared to 166.07 U/mL in low avidity cases. Low clinical severity and inconclusive IgM antibody results are more likely in high avidity measles cases. Measles cases were more common in adults. Therefore, a further dose of vaccines should be recommended for 30–39 years in Tianjin. [ABSTRACT FROM AUTHOR]

Background. Poliomyelitis has historically been endemic in China and has been considered an important cause of disability and death.Methods. We reviewed strategies and measures of poliomyelitis control and eradication from 1953 to 2012. Data from notifiable disease and routine immunization reporting systems and acute flaccid paralysis (AFP) surveillance were analyzed.Results. About 20 000 poliomyelitis cases were reported annually in the prevaccine era. During 1965–1977, live, attenuated oral poliomyelitis vaccine (OPV) was administered to children through annual mass campaigns in the winter, and the number of poliomyelitis cases started to decline. A cold chain system was established during 1982, and OPV coverage increased during the early stage of the Expanded Programme on Immunization, from 1978 to 1988. Between 1989 and 1999, routine immunization was strengthened, supplementary immunization activities (SIAs) were conducted, and the AFP surveillance system was established. China reported a last indigenous poliomyelitis case in 1994 and was certified as free of polio in 2000. To maintain its polio-free status, China kept >90% coverage of 3 doses of OPV, conducted SIAs in high-risk areas, and maintained high-quality of AFP surveillance. China succeeded in stopping the outbreak in Xinjiang in 2011.Conclusions. China's polio-free status was achieved and maintained through strengthening routine immunization and implementing SIAs and AFP surveillance. [ABSTRACT FROM PUBLISHER]

Abstract: Human enterovirus 71 (EV71) is a cause of hand, foot and mouth disease (HMFD) in children under 6 years old, and could cause serious neurological complications in some patients. Numerous large outbreaks of EV71 caused HMFD have occurred recently in Asia, especially in China. The cross-reactivity of EV71 with human brain tissue was observed and the cross-reactivity inducing regions were identified in previously study, which suggested that there were two regions in structural proteins of virus should be avoided in the vaccine. Six peptides without cross-reactivity were selected and combined into three vaccine candidates and applied in further evaluation in neonatal mice. The Vac6 comprising the peptides of P70–159, P140–249, P324–443 and P746–876 of the structural proteins could provide effective protection on pups against virus infection, as shown in viral copies detection and histopathology examination. Immunohistochemical staining results indicated that Vac6 had no cross-reactivity with human brain tissues. Our results suggested that Vac6 could have potential clinical value against EV71 epidemics caused mainly by C4 strains in the mainland of China. [Copyright &y& Elsevier]

Abstract: Background: An outbreak of hand, foot, and mouth disease (HFMD) included 1149 people in Linyi City, Shandong Province, China, in 2007: three children died. Objectives: To characterize the pathogens responsible for this outbreak and to analyze their genetic features. Study design: A total of 233 clinical specimens were collected from 105 hospitalized patients, including 11 patients with severe HFMD. Virological investigations (direct RT-PCR, viral isolation and molecular identification) and phylogenetic analysis were performed. Results: Human enterovirus 71 (HEV71) was the main pathogen that caused this outbreak, based on clinical manifestations, epidemiological data, and laboratory results. Phylogenetic analysis indicated that the Shandong HEV71 isolates belonged to 3 lineages in subgenotype C4. Subgenotype C4 could be further divided into two clusters (C4a and C4b), which corresponded to two time periods. Cluster C4a HEV71 has been the predominant virus circulating in mainland China in the past 5 years. Conclusions: The 2007 HFMD outbreak was mainly caused by HEV71 subgenotype C4 with 3 transmission chains. This virus has been continuously circulating in China since 1998. The Shandong strains co-evolved with isolates from other provinces in mainland China and neighboring countries. [Copyright &y& Elsevier]