"Abstract
To understand how coronavirus disease 2019 vaccines impact infection risk in children <5 years, we assessed risk of severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) infection from September 2022 to April 2023 in 3 cohort studies. There was no difference in risk by vaccination status. While vaccines reduce severe disease, they may not reduce SARS-CoV-2 infections in young children...
Results
... There was no difference in risk of infection or symptomatic COVID-19 by vaccination status alone, regardless of timing of vaccination or manufacturer type. However, naïve participants vaccinated with Pfizer-BioNTech were more likely to be infected and experience symptomatic COVID-19 compared to naïve and unvaccinated participants (HR: 2.59 [95% CI: 1.27–5.28]), whereas participants with evidence of prior infection and who were vaccinated with Pfizer-BioNTech were less likely to be infected (HR: 0.22 [95% CI: 0.05–0.95])."
US Government
This article is a work of the United States government. Such works are not entitled to domestic copyright protection under U.S. law and are therefore in the public domain.
This act only applies to U.S. domestic copyright as that is the extent of U.S. federal law. The U.S. government asserts that it can still hold the copyright to those works in other countries https://www.usa.gov/government-works