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
1, and Ruy M. Ribeiro
1
Author affiliations: Fundação Francisco Manuel dos Santos, Lisbon, Portugal (L. Canto e Castro); Universidade de Lisboa, Lisbon (L. Canto e Castro, I. Domingues, C. Silva, A. Gomes, M. Serrano, Â. Afonso, M. Veldhoen, M.M. Mota, B. Silva-Santos, R.M. Ribeiro); Centro de Medicina Laboratorial Germano de Sousa, Lisbon (A.H.G. Pereira, R. Ribeiro, M.J. Rego de Sousa, J.G. Rego de Sousa, G. de Sousa); CTI Clinical Trial and Consulting Services, Portugal (C. Alves, L. Veloso, V. Vicente, D. Alves); Los Alamos National Laboratory, Los Alamos, New Mexico, USA (R.M. Ribeiro)
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Table 1
Prevalence of antibodies against severe acute respiratory syndrome coronavirus 2, by person age, adjusted for sensitivity and specificity, Portugal, September 8‒October 14, 2020
Population density |
Seroprevalence, % (95% CI), by age, y |
<18, n = 2,108 |
18–54, n = 6,495 |
>55, n = 4,795 |
Overall, n = 13,398 |
Low, n = 2,298 |
0.6 (0.2‒2.8) |
1.5 (0.9‒2.6) |
1.7 (1.0‒2.9) |
1.4 (1.1‒2.2) |
Medium, n = 5,006 |
1.4 (0.8‒2.7) |
1.7 (1.3‒2.4) |
1.7 (1.2‒2.5) |
1.6 (1.4‒2.1) |
High, n = 6,094 |
3.5 (2.5‒5.0) |
3.1 (2.6‒3.9) |
2.2 (1.7‒3.1) |
2.9 (2.5‒3.4) |
Overall |
2.4 (1.9‒3.3) |
2.3 (2.0‒2.8) |
1.9 (1.6‒2.4) |
2.2 (2.0‒2.5) |
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Page updated: October 19, 2021
Page reviewed: October 19, 2021
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