SARS-CoV-2 seroprevalence in school children and teachers in Paraguay

Abstract

Background: In Paraguay there has been a gradual and voluntary return to classes in a blended mode. Aim: To estimate the anti-SARS-CoV2 seroprevalence in schoolchildren and teachers.

Methods: Cross-sectional descriptive study, carried out between October 25 and November 5, 2021. Structured surveys were applied to schoolchildren and teachers from five schools, two in Asunción and three in the Central Department. In addition, samples of fingerstick blood for antibody detection by rapid immunochromatographic test were obtained.

Results: A total of 148 teachers and 966 schoolchildren were included, 12.4% of the schoolchildren had received the anti-COVID-19 vaccine, which represents 61.9% of the students qualified for vaccination. Among the teachers, 97.3% received the COVID-19 vaccine, 95.9% had the complete schedule, 34.5% of teachers and 3.9% of schoolchildren reported having had COVID-19. The seroprevalence with no vaccine status discrimination was 37.7% in schoolchildren and 91.9% in teachers. In unvaccinated schoolchildren, seroprevalence was 30.9% and in unvaccinated teachers 25.0%.

Conclusions: The high anti-SARS-CoV-2 seroprevalence reflects an important viral circulation in the community. Almost the entire teaching staff had the complete vaccination schedule, and more than half of the qualified students had received at least a dose. The high seropositivity in vaccinated is highlighted. It is recommended to continue with the preventive non-pharmacological measures and vaccination.