Emerging Infectious Diseases (Nov 2021)

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

  • Luísa Canto e Castro,
  • Ana Helena Guia Pereira,
  • Rita Ribeiro,
  • Catarina Alves,
  • Luís Veloso,
  • Vera Vicente,
  • Dalila Alves,
  • Inês Domingues,
  • Cláudia Silva,
  • Andreia Gomes,
  • Marta Serrano,
  • Ângela 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

DOI
https://doi.org/10.3201/eid2711.210636
Journal volume & issue
Vol. 27, no. 11
pp. 2878 – 2881

Abstract

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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.

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