ArticleLancet regional health. Americas2024
SARS-CoV-2 transmission in a highly vulnerable population of Brazil: a household cohort study.
Article in Lancet regional health. Americas, 2024. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 8 papers.
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Who cites it
8 citing papers in PubMed.
- Assessing SARS-CoV-2 transmission in African households from the reanalysis of serosurveys.American journal of epidemiology · 2026Article
- Implementing a multi-centric cohort study during the SARS-CoV-2 pandemic in a resource-constrained setting: challenges, adaptive solutions, and lessons from Brazil.Archives of public health = Archives belges de sante publique · 2026Article
- History of self-reported COVID-19 cases and hospitalizations in the Brazilian population: a countrywide survey.International journal of epidemiology · 2026Article
- Roles of children, isolation measures and socioeconomic status in SARS-CoV-2 household transmission: a retrospective cohort study in a southern US city.BMJ public health · 2026Article
- Prevalence of SARS-CoV-2 Infection Among Vulnerable Populations Relying on Public Health Services: Findings from the AVISA Study in Brazil.Revista da Sociedade Brasileira de Medicina Tropical · 2026Article
- Article
- Polymorphisms in the ACE I/D (Tropical medicine and infectious disease · 2024Article
- Health inequities in COVID-19: insights from Rio de Janeiro's marginalised communities.Lancet regional health. Americas · 2024Article
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Authors and funding
29 authors.
Funding
Abstract
Background: Household transmission studies seek to understand the transmission dynamics of a pathogen by estimating the risk of infection from household contacts and community exposures. We estimated within/extra-household SARS-CoV-2 infection risk and associated factors in a household cohort study in one of the most vulnerable neighbourhoods in Rio de Janeiro city. Methods: Individuals ≥1 years-old with suspected or confirmed COVID-19 in the past 30 days (index cases) and household members aged ≥1 year were enrolled and followed at 14 and 28 days (study period November/2020-December/2021). RT-PCR testing, COVID-19 symptoms, and SARS-CoV-2 serologies were ascertained in all visits. Chain binomial household transmission models were fitted using data from 2024 individuals (593 households). Findings: Extra-household infection risk was 74.2% (95% credible interval [CrI] 70.3-77.8), while within-household infection risk was 11.4% (95% CrI 5.7-17.2). Participants reporting having received two doses of a COVID-19 vaccine had lower extra-household (68.9%, 95% CrI 57.3-77.6) and within-household (4.1%, 95% CrI 0.4-16.6) infection risk. Within-household infection risk was higher among participants aged 10-19 years, from overcrowded households, and with low family income. Contrastingly, extra-household infection risk was higher among participants aged 20-29 years, unemployed, and public transportation users. Interpretation: Our study provides important insights into COVID-19 household/community transmission in a vulnerable population that resided in overcrowded households and who struggled to adhere to lockdown policies and social distancing measures. The high extra-household infection risk highlights the extreme social vulnerability of this population. Prioritising vaccination of the most socially vulnerable could protect these individuals and reduce widespread community transmission. Funding: Fundação Oswaldo Cruz, CNPq, FAPERJ, Royal Society, Instituto Serrapilheira, FAPESP.
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