Study shows breakthrough COVID-19 infections occur more often and are more severe in immunocompromised

A real-world retrospective cohort study involving nearly 1.2 million people shows COVID-19 infections in the 'fully' vaccinated are rare but are more common and severe in people with weaker immune systems.

source https://medicalxpress.com/news/2021-11-breakthrough-covid-infections-severe-immunocompromised.html