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Prevalence of SARS-CoV-2 Antibodies after First 6 Months of COVID-19 Pandemic, Portugal

2021; Centers for Disease Control and Prevention; Volume: 27; Issue: 11 Linguagem: Inglês

10.3201/eid2711.210636

1080-6059

Luísa Canto e Castro, Ana Helena Guia Pereira, Rita Ribeiro, Catarina Bubach Ribeiro Alves, L. B. Veloso, Vera Vicente, Dalila Alves, Inês Domingues, Cláudia Silva, Andréia Gomes, Marta Serrano, Ãngela Afonso, Marc Veldhoen, Maria José Rego de Sousa, José Germano Rego de Sousa, Germano de Sousa, Maria M. Mota, Bruno Silva‐Santos, Ruy M. Ribeiro,

SARS-CoV-2 detection and testing

In September 2020, we tested 13,398 persons in Portugal for antibodies against severe acute respiratory syndrome coronavirus 2 by using a quota sample stratified by age and population density. We found a seroprevalence of 2.2%, 3-4 times larger than the official number of cases at the end of the first wave of the pandemic.