Nationally representative SARS-CoV-2 antibody prevalence estimates after the first epidemic wave in Mexico

Ana Basto-Abreu, Martha Carnalla, Leticia Torres-Ibarra, Martín Romero-Martínez, Jesús Martínez-Barnetche, Irma López-Martínez, Rodrigo Aparicio-Antonio, Teresa Shamah-Levy, Celia Alpuche-Aranda, Juan A. Rivera and Tonatiuh Barrientos-Gutierrez ()
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Ana Basto-Abreu: National Institute of Public Health
Martha Carnalla: National Institute of Public Health
Leticia Torres-Ibarra: National Institute of Public Health
Martín Romero-Martínez: National Institute of Public Health
Jesús Martínez-Barnetche: National Institute of Public Health
Irma López-Martínez: Institute for Epidemiological Diagnosis and Reference
Rodrigo Aparicio-Antonio: Institute for Epidemiological Diagnosis and Reference
Teresa Shamah-Levy: National Institute of Public Health
Celia Alpuche-Aranda: National Institute of Public Health
Juan A. Rivera: National Institute of Public Health
Tonatiuh Barrientos-Gutierrez: National Institute of Public Health

Nature Communications, 2022, vol. 13, issue 1, 1-8

Abstract: Abstract Seroprevalence surveys provide estimates of the extent of SARS-CoV-2 infections in the population, regardless of disease severity and test availability. In Mexico in 2020, COVID-19 cases reached a maximum in July and December. We aimed to estimate the national and regional seroprevalence of SARS-CoV-2 antibodies across demographic and socioeconomic groups in Mexico after the first wave, from August to November 2020. We used nationally representative survey data including 9,640 blood samples. Seroprevalence was estimated by socioeconomic and demographic characteristics, adjusting by the sensitivity and specificity of the immunoassay test. The national seroprevalence of SARS-CoV-2 antibodies was 24.9% (95%CI 22.2, 26.7), being lower for adults 60 years and older. We found higher seroprevalence among urban and metropolitan areas, low socioeconomic status, low education and workers. Among seropositive people, 67.3% were asymptomatic. Social distancing, lockdown measures and vaccination programs need to consider that vulnerable groups are more exposed to the virus and unable to comply with lockdown measures.

Date: 2022
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DOI: 10.1038/s41467-022-28232-9

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