Seroprevalence and risk factors for SARS-CoV-2 infection in middle-sized cities of Burkina Faso: a descriptive cross-sectional study

Abstract

AbstractBackgroundSince March 2020, COVID-19 has evolved from a localized outbreak to a global pandemic. We assessed the seroprevalence of COVID-19 in three towns in the Centre Sud region of Burkina Faso.MethodsA population-based cross-sectional survey was conducted in three medium-sized towns in Burkina Faso’s Centre Sud region, from June to July 2021. Subjects aged 16 or over at the time of the survey were considered for this seroprevalence study. The Biosynex COVID-19 BSS rapid test was used to detect immunoglobulin G (IgG) and immunoglobulin M (IgM) against SARS-CoV-2. A standardized questionnaire was also administered to collect additional information.ResultsA total of 2449 eligible participants (age ≥ 16 years) were identified. Serological tests for COVID-19 were performed in 2155 individuals. Finally, 2143 valid tests were retained and analyzed. Out of the entire sample, 246 positive tests were observed, corresponding to a prevalence of 11.48%. Prevalence was 9.35% (58 cases) in Kombissiri, 12.86% (80 cases) in Manga and 11.99% (108 cases) in Pô. By gender, 13.37% of women (164 cases) tested positive, and 8.95% of men (82 cases). Women accounted for 66.67% of all positive test subjects. The results show a significantly higher seroprevalence in women (P = 0.007), people over 55 years old (P = 0.004), overweight or obese people (P =0.026) and those with drinking water sources at home (0.013).ConclusionsThe results of this study show that the COVID-19 virus also circulates in the population of medium-sized towns in Burkina Faso, far more than is officially reported in the country. The study also highlighted the greater vulnerability of women to the epidemic, and the challenge of access to water in the face of diseases such as COVID-19. The preventive measures put in place to fight the pandemic must take these different factors into account.