# Detection of IgG antibodies against the receptor binding domain of the spike protein and nucleocapsid of SARS-CoV-2 at university students from Southern Mexico: a cross-sectional study

## TL;DR

This study measured SARS-CoV-2 IgG antibodies in university students in Southern Mexico, finding a 39.9% seroprevalence against both spike and nucleocapsid proteins.

## Contribution

The study provides region-specific seroprevalence data among university students in Southern Mexico, highlighting factors like age and vaccination status.

## Key findings

- 39.9% of students had IgG antibodies against both S and N proteins of SARS-CoV-2.
- Seroprevalence was highest in Costa Grande, Acapulco, and Centro work centers.
- Seroprevalence was associated with age, prior COVID-19, contact with infected individuals, and vaccination.

## Abstract

Natural infection and vaccination against SARS-CoV-2 is associated with the development of immunity against the structural proteins of the virus. Specifically, the two most immunogenic are the S (spike) and N (nucleocapsid) proteins. Seroprevalence studies performed in university students provide information to estimate the number of infected patients (symptomatic or asymptomatic) and generate knowledge about the viral spread, vaccine efficacy, and epidemiological control. Which, the aim of this study was to evaluate IgG antibodies against the S and N proteins of SARS-CoV-2 at university students from Southern Mexico.

A total of 1418 serum samples were collected from eighteen work centers of the Autonomous University of Guerrero. Antibodies were detected by Indirect ELISA using as antigen peptides derived from the S and N proteins.

We reported a total seroprevalence of 39.9% anti-S/N (positive to both antigens), 14.1% anti-S and 0.5% anti-N. The highest seroprevalence was reported in the work centers from Costa Grande, Acapulco and Centro. Seroprevalence was associated with age, COVID-19, contact with infected patients, and vaccination.

University students could play an essential role in disseminating SARS-CoV-2. We reported a seroprevalence of 54.5% against the S and N proteins, which could be due to the high population rate and cultural resistance to safety measures against COVID-19 in the different regions of the state.

The online version contains supplementary material available at 10.1186/s12879-024-09435-5.