News CDC gives go-ahead to J&J, Moderna and mix-and-match COVID boosters, beginning as soon as Friday October 21, 2021October 21, 2021Elizabeth Weise, USA TODAYComments Off on CDC gives go-ahead to J&J, Moderna and mix-and-match COVID boosters, beginning as soon as Friday All COVID-19 booster doses will be free, and a booster is not required to be considered fully vaccinated.