The results lend weight to “mix-and-match” booster shots, which the United States’ top public health official endorsed this fall.
By Amy Cheng, Adela Suliman and Hannah Knowles, Washington Post U.S.
Fri, 12/03/2021 - 8:15am
The results lend weight to “mix-and-match” booster shots, which the United States’ top public health official endorsed this fall.