News Who should get a third COVID vaccine shot? About 2.7M immunocompromised Americans, CDC says. August 13, 2021 Karen Weintraub, USA TODAY Comments Off on Who should get a third COVID vaccine shot? About 2.7M immunocompromised Americans, CDC says. Extra vaccines should be available to the immunocompromised in the next few days, with a question added about immune status before all vaccinations.