SARS-CoV-2 Antibody Seroprevalence in Industry Workers in Split-Dalmatia and Sibenik-Knin County, Croatia

Objectives: To examine seroprevalence of severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) antibodies in industry workers population sample. Methods: From 23 to April 28, 2020, we conducted serological testing for antibodies (Immunoglobulin G (IgG) and Immunoglobulin M (IgM)) on 1494 factory employees living in the Split-Dalmatia and Sibenik-Knin County (Croatia). Results: We detected antibodies in 1.27% of participants (95% confidence interval [CI] 0.77-1.98%). In Split facility 13/1316 (0.99%, 95% CI 0.53-1.68%) of participants were tested positive, of which 13/1079 (1.20%, 95% CI 0.64-2.05%) of those living outside the facility and 0/237 (0%, 95% CI 0-1.26%) of those living inside the facility. In Knin facility, 6/178 (3.37%, 95% CI 1.25-7.19%) participants were tested positive for antibodies. Conclusions: The study showed relatively small SARS-CoV-2 antibody seroprevalence in the DIV Group population sample.