https://www.sciencedaily.com/releases/2021/10/211011110812.htm > "The results strongly suggest that vaccination is important not only for individual protection, but also for reducing transmission, especially within families, which is a high-risk environment for transmission," says Peter Nordström, professor of geriatric medicine at Umeå University. > There is a vast body of research showing that vaccines strongly reduce the risk of COVID-19. However, less is known about the influence of vaccination on transmission of the virus in high-risk environments, such as within families. This is what researchers at Umeå University aimed to investigate in a new study.