A third or fourth dose of one of the COVID-19 messenger RNA vaccines offered increased protection among adults during the early omicron wave, according to data from more than 270,000 patients reported Friday in MMWR.
“The findings of this study, in conjunction with recently published data [in The New England Journal of Medicine] showing people infected with BA.2 may also have antibodies that can protect against illness with BA.5, suggest that currently available vaccines may provide protection against serious illness caused by the currently circulating BA.5 variant,” the CDC said