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. 2023 Feb;29(3):590-594.
doi: 10.3201/eid2903.221546. Epub 2023 Feb 2.

Seroprevalence of Specific SARS-CoV-2 Antibodies during Omicron BA.5 Wave, Portugal, April-June 2022

Irina Kislaya, Aryse Melo, Marta Barreto, Camila Henriques, Carlos Aniceto, Carla Manita, Sara Ramalhete, João Almeida Santos, Sofia Soeiro, Ana Paula Rodrigues; ISN4COVID-19 Group1

Seroprevalence of Specific SARS-CoV-2 Antibodies during Omicron BA.5 Wave, Portugal, April-June 2022

Irina Kislaya et al. Emerg Infect Dis. 2023 Feb.

Abstract

After the rapid spread of SARS-CoV-2 BA.5 Omicron lineage in Portugal, we developed a seroepidemiologic survey based on a sample of 3,825 residents. Results indicated that from April 27 through June 8, 2022, the estimated seroprevalence of SARS-CoV-2 nucleocapsid or spike IgG was 95.8%, which indicates a high level of protection.

Keywords: 2019 novel coronavirus disease; BA.5; COVID-19; IgG; Omicron; Portugal; SARS-CoV-2; coronavirus disease; respiratory infections; seroepidemiological survey; seroprevalence; severe acute respiratory syndrome coronavirus 2; viruses; zoonoses.

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Figures

Figure 1
Figure 1
Daily number of cases and percentages of SARS-CoV-2 seroprevalence in 4 serial seroepidemiologic surveys in Portugal, May 2020–June 2022. Tick marks correspond to the first day of the month.
Figure 2
Figure 2
Data collection sites for study of seroprevalence of specific SARS-CoV-2 antibodies during the Omicron BA.5 wave, Portugal, April–June 2022 (ISN4COVID-19 study). NUTSIII, territorial units for statistics level III.
See this image and copyright information in PMC

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