To date three community seroepidemiological cross-sectional studies have been conducted in the Manhiça district, with a sample size of 1201 subjects randomly selected from the Demographic Surveillance System maintained by the Manhiça Health Research Center. From each participant, blood samples were collected to investigate the presence of anti-SARS-CoV-2 antibodies. Additionally, nasopharyngeal (NP) swabs were collected from a subsample of the 1201 subjects to determine the community prevalence of infection by SARS-CoV-2.
Table 1. Overall seroprevalence and prevalence evolution during the 3 cross-sectional studies conducted in the Manhiça district
cross | period | enrolled | seroprevalence | prevalence |
---|---|---|---|---|
Cross 1 | April-June 2021 | 1201 | 27.6 | 4.0 |
Cross 2 | October-November 2021 | 1201 | 63.6 | 0.7 |
Cross 3 | January-February 2022 | 1201 | 91.2 | 10.1 |
Fig 1. Seroprevalence and prevalence between age groups in cross-sectionals, Manhiça district
The following plot presents the level of seroprevalence rate by each administrative post of the Manhiça district during each of the cross-sectional studies.
Fig 2. Evolution of Seroprevalence in Administrative Post of Manhiça District Between Cross-sectionals.