U.S. health officials announce plan for COVID booster shots for all Americans starting Sept. 20

The shots are in response to the spread of the virus's highly contagious delta varient.
Soby Bai gets a COVID vaccine at a clinic on August 04, 2021 in Ferguson, Missouri.
Man receiving COVID vaccine.
Getty Images

Top U.S. health officials said Wednesday they have developed a plan to start offering  COVID-19 booster shots to American startin the third week in September. 

In their expected announcement, the officials cited evidence that protection is waning against hospitalization, death, mild and moderate infections, as the highly contagious delta variant continues to spread, according to NBC News.