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Research Article: Serological survey to estimate SARS-CoV-2 infection and antibody seroprevalence at a large public university: A cross-sectional study

Date Published: 2023-08-03

Abstract:
Objective This study investigated the seroprevalence of SARS-CoV-2 antibodies among adults over 18 years. Design Prospective cohort study. Settings A large public university. Participants This study took volunteers over 5?days and recruited 1064 adult participants. Primary outcome measures Seroprevalence of SARS-CoV-2-specific antibodies due to previous exposure to SARS-CoV-2 and/or vaccination. Results The seroprevalence of the antireceptor binding domain (RBD) antibody was 90% by a lateral flow assay and 88% by a semiquantitative chemiluminescent immunoassay. The seroprevalence for antinucleocapsid was 20%. In addition, individuals with previous natural COVID-19 infection plus vaccination had higher anti-RBD antibody levels compared with those who had vaccination only or infection only. Individuals who had a breakthrough infection had the highest anti-RBD antibody levels. Conclusion Accurate estimates of the cumulative incidence of SARS-CoV-2 infection can inform the development of university risk mitigation protocols such as encouraging booster shots, extending mask mandates or reverting to online classes. It could help us to have clear guidance to act at the first sign of the next surge as well, especially since there is a surge of COVID-19 subvariant infections.

Introduction:
The COVID-19 pandemic has been a major challenge worldwide. COVID-19 is caused by a novel betacoronavirus (SARS-CoV-2) and was first reported from Wuhan, China, on 8 December 2019. The WHO declared it a pandemic on 11 March 2020. 1 2 The USA had recorded more than 101?million cases and 1?091?000 deaths by 11 January 2023. Since the end of 2019, communities around the world have had to fight against outbreaks, including physical distancing, staying at home, avoiding groups indoors, wearing masks, frequent testing…

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