SARS-CoV-2 Seroprevalence in Western Romania, March to June 2021.

Background and Objectives: The extent of SARS-CoV-2 infection among a population may be assessed by the presence of serum SARS-CoV-2 antibodies, which indicates previous exposure. The aim of this study was to determine the seroprevalence of SARS-CoV-2 infection in the adult population from Western Romania. Materials and Methods: Samples of 2443 consecutive individuals, referred for routine laboratory investigations, were tested for SARS-CoV-2 antibodies using the Elecsys immunoassay that targets the nucleocapsid protein, for identifying the presence of the total antibodies against SARS-CoV-2. Results: The overall SARS-CoV-2 seroprevalence was 45.60%. SARS-CoV-2 seroprevalence was significantly higher in age group 30-49 years (53.94%) compared to age groups 50-69 years (43.53%) and 70-91 years (30.79%) (p < 0.001, p < 0.001, respectively). No significant difference in seroprevalence was observed between females (44.83%) and males (47.05%). Conclusions: Our data revealed a high seroprevalence of SARS-CoV-2 infection in the adult population from Western Romania and indicate the rapid and significant spread of the virus. The estimated prevalence of 45.60% was 6 times higher than the rate of confirmed COVID-19 cases reported in the study area. This indicates the magnitude of virus transmission in the community.

SARS-CoV-2 Seroprevalence in Children from Western Romania, March to June 2021.

Limited data are available regarding severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) seroprevalence in children. In this study, we assessed for the first time the seroprevalence of SARS-CoV-2 in children from Romania. Serum samples of 379 children were investigated for the presence of SARS-CoV-2 total antibodies. Serologic tests were performed using Elecsys Anti-SARS-CoV-2 electrochemiluminiscence immunoassay that targets the nucleocapsid protein of the virus. The overall seroprevalence of SARS-CoV-2 total antibodies was 46.70%. No significant difference was observed between seropositive and seronegative children according to age groups, gender, and area of residence. Our findings revealed a high SARS-CoV-2 seroprevalence in Romanian children at the end of the third COVID-19 pandemic wave. Results suggest that children, regardless of age, gender, or area of residence, are susceptible to infection with SARS-CoV-2. Seroprevalence in children was similar to the seroprevalence reported in the adult population from Western Romania during the same period of time, March to June 2021.