Compared to the working-age population (19–59 years of age), the odds ratio for children 0–4 years of age had a significant protective effect during the Zeta wave (odds ratio: 0.36) and there was a trend toward significance during the Delta wave (odds ratio: 0.5).
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Incidence of SARS-CoV-2 over four epidemic waves in a low-resource community in Rio de Janeiro, Brazil: A prospective cohort study.
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