Surveillance and Seroprevalence: Evaluation of IgG antibodies for SARS-Cov2 by ELISA in the popular neighborhood Villa Azul, Quilmes, province of Buenos Aires, Argentina

Abstract

Objective: To evaluate the prevalence of antibodies against SARS Cov-2 in Barrio Villa Azul, in the Quilmes district, together with other demographic and mobility variables. Methods: Descriptive cross-sectional study carried out through a systematic probabilistic sample. The sample consisted of 311 cases, of which 284 cases consented to the application of the test. A survey was applied to 100% of the cases tested. The information was processed with SPSS 23 software and the analysis considered the weighting of the sample according to the established probabilistic design. Results: 61% were women. The mean age was 40 years, the population structure was similar to that of the universe. The presence of antibodies was 14.8% of the cases, the majority in women and 40 year-old who did not go to work and did not use public transport. Being a health worker did not represent a greater risk for infection. It is observed that of each symptomatic case there would be 1.2 asymptomatic. Conclusions: There was a higher prevalence of people with antibodies than in other studies, although comparing similar territories the prevalence of antibodies was lower and this could be a consequence of a timely territorial approach. The seroprevalence was predominantly in women and this would not indicate greater contagion in this sex since there is uncertainty in the relationship between infection and antibodies. It was observed that the infections could have been within the home or in the community environment since it affected people who did not go out to work.