The Covid-19 pandemic killed off one strain of the flu, and that will change the next vaccines
The Covid-19 pandemic killed off one strain of the flu, and that will change the next vaccines

For 10 years, Americans have had access to flu shots that protect against four strains of the virus: two A strains and two B strains. Starting this fall, however, all the flu shots distributed in the United States will contain only three strains, and the change happened in part because of Covid-19.
