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Recently it has been demonstrated the clinical effectiveness of tocilizumab (TCZ) associated with systemic steroids for the treatment of severe SARS-CoV-2 pneumonia with rapid progression. The objective of this work was to describe the epidemiological, clinical, laboratory and evolution characteristics of the patients who received this treatment. Between March and June 2021, TCZ was administered in a cohort study of adults with severe SARS-CoV-2 pneumonia, in a private hospital in the City of Buenos Aires; 30 patients were included, 63% men, middle age 55 years. Obesity (33%), arterial hypertension (26%) and diabetes (25%) were the most frequent comorbidities. We found associated infections during hospitalization in half of the cohort, within them, pneumonia associated with mechanical ventilation was the most frequent and methicillin-sensitive Staphylococcus aureus, the most prevalent germ. Patients with secondary infections had a higher requirement for invasive mechanical ventilation (IMV) (100% vs. 19% p < 0.001) and more days of hospitalization (median 23 vs. 15 p = 0.009). Of the entire cohort, seven who died during hospitalization had the highest requirement for IMV (100% vs. 43% p = 0.010) and secondary infections (100% vs. 35%, p = 0.006). In this relatively young cohort of patients with severe or critical SARS-CoV-2 pneumonia, obesity does not appear to be a predisposing factor for superinfection or death. The presence of secondary infections, organ failure and shock are presented as probable factors of worse evolution, as well as the requirement of IMV.

Introduction: there is evidence on the effectiveness and safety of tocilizumab (TZC) used in combination with systemic corticosteroids for severe SARS-CoV-2 pneumonia treatment. The purpose of this study was to describe epidemiological, clinical, and laboratory features as well as clinical outcome of patients receiving this combination therapy compared with those receiving only corticosteroids., Methods: a retrospective cohort study, which included adults with severe SARS-CoV-2 pneumonia, was conducted between March and August 2021. Enrolment included 101 patients, 46 with corticosteroids and 55 with corticosteroids plus tocilizumab., Results: median age was 58 years old and 63.9% were females. High blood pressure was present in 36.1% and obesity in 54.6%. Survival in the cohort was 81.4%, with a median hospital stay of 19.0 days. Secondary infections were present in 47.4% of the cohort. Patients in the TZC group had a lower C reactive protein (CRP) at discharge, lower rate of multiple organ failure, better functional status at discharge and shorter hospital stay. In a bivariate analysis, no differences were found in mortality rate and secondary infections occurrence. When assessing clinical status as per WHO Ordinal Scale there was a significant difference in its variability from worsening to discharge (or 14 days), evidencing a better functional status in patients receiving TCZ., Discussion: we were able to demonstrate its efficacy in reducing inflammatory biomarkers and a trend towards fewer days of hospitalization, with no impact on mortality.

Coinfection of SARS-CoV-2 and dengue virus has not been previously reported. We report a confirmed case with favourable outcome, but whether the occurrence of simultaneous infections may alter the usual clinical course of each infection is still unknown.

Background: Community-associated methicillin-resistant Staphylococcus aureus (CA-MRSA) is now the most common cause of skin and skin structure infections (SSSI) in several world regions. In Argentina prospective, multicenter clinical studies have only been conducted in pediatric populations., Objective: PRIMARY: describe the prevalence, clinical and demographic characteristics of adult patients with community acquired SSSI due to MRSA; secondary: molecular evaluation of CA-MRSA strains. Patients with MRSA were compared to those without MRSA., Materials and Methods: Prospective, observational, multicenter, epidemiologic study, with molecular analysis, conducted at 19 sites in Argentina (18 in Buenos Aires) between March 2010 and October 2011. Patients were included if they were ≥ 14 years, were diagnosed with SSSI, a culture was obtained, and there had no significant healthcare contact identified. A logistic regression model was used to identify factors associated with CA-MRSA. Pulse field types, SCCmec, and PVL status were also determined., Results: A total of 311 patients were included. CA-MRSA was isolated in 70% (218/311) of patients. Clinical variables independently associated with CA-MRSA were: presence of purulent lesion (OR 3.29; 95%CI 1.67, 6.49) and age <50 years (OR 2.39; 95%CI 1.22, 4.70). The vast majority of CA-MRSA strains causing SSSI carried PVL genes (95%) and were SCCmec type IV. The sequence type CA-MRSA ST30 spa t019 was the predominant clone., Conclusions: CA-MRSA is now the most common cause of SSSI in our adult patients without healthcare contact. ST30, SCCmec IV, PVL+, spa t019 is the predominant clone in Buenos Aires, Argentina.

Introduction: Recently, there has been increasing interest in the role of "treatment as prevention" (TasP). Some of the questions regarding TasP strategies arise from the perceived difficulties in achieving and maintaining viral load (VL) suppression over time and the risk of emergence of viral resistance that could compromise future treatment options. This study was conducted to assess these questions in a resource-limited setting., Methodology: We performed a retrospective observational study of HIV-infected patients diagnosed in the pre-HAART era on follow-up at a private center from Buenos Aires, Argentina. Socio-demographic, clinical, and laboratory data were extracted from clinical charts. Analyses were performed to test for potential associations of selected variables with current virologic failure or use of third-line drugs., Results: Of 619 patients on follow-up, 82 (13.2%) were diagnosed in the pre-HAART era. At the time of our study, 79 (96.3%) patients were on HAART, with a median duration of 14 years (IQR 12-15) of therapy, and exposure to mono or dual nucleoside reverse transcriptase inhibitors regimens in 47.8% of cases. Sixty-nine patients (87.3%) had undetectable VL, 37 (46.8%) never presented virologic failure, and 19 (24.1%) experienced only one failure. Thirteen patients (16.5%) were receiving third-line ART regimens, with an average of 2.7-fold more virologic failures than those on first- or second-line regimens (p = 0.007)., Conclusions: Maintaining viral load suppression over time in resource-limited-settings is feasible.

Here we present a survey including 52 drug-naive recently HIV-1-infected subjects from Buenos Aires City and province (79%) and 3 other regions in Argentina (21%). Recent infections were established from previous negative serology (32/52), indeterminate Western blot (12/52), or acute retroviral syndrome after high-risk HIV exposure (8/52) within 9 months before genotyping (median time, 4.2 months). Genotyping was performed from plasma by sequencing both protease and reverse transcriptase. Phylogenetic analysis combined with bootscanning resulted in 21 subtype B sequences and 31 B/F recombinants (RecBF). On protease, minor resistance-related mutations were found in both subtype B and RecBF with low frequencies. The substitution L89M, recently suggested as a resistance-related mutation in some subtype F viruses, was observed in 1 RecBF. On reverse transcriptase, major resistance-related mutations were found in 4 of 52 (7.7%) patients from different health centers: M41L (subtype B) and K103N+/-P225H (1 RecBF and 2 subtype B). The greater than 5% resistance threshold found indicates a need for sentinel resistance surveillances calling for an update in the current resistance testing guidelines in Argentina.