COVID-19 vaccine effectiveness against symptomatic SARS-CoV-2 infections, COVID-19 related hospitalizations and deaths, among individuals aged ≥65 years in Portugal: A cohort study based on data-linkage of national registries February-September 2021.

PLoS One · 2022 · PMC9469958 · PMID 36099273

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an increasing trendno p-value reported

Along with the end of the lockdown and the increasing frequency of the Delta variant, an increasing trend of the epidemic activity was observed in all Portuguese regions affecting mainly young adults and adolescents [ 7 ].

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