With a new version of the Omicron coronavirus variant picking up steam in the United States, as many as 28 million seniors remain at risk of becoming severely ill from Covid-19, either because they are unvaccinated or partially vaccinated, or because it has been more than five months since their second or third dose of a vaccine, according to a CNN analysis of federal data.

(SOURCE) https://www.cnn.com/2022/03/16/health/key-indicator-ba2-wave/index.html