People receive COVID-19 booster shots in U.S.
Xinhua
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A woman takes the COVID-19 booster shot at the Tournament House in Pasadena, Los Angeles County, California, the United States, Aug. 19, 2021. (Xinhua)

A medical worker prepares the COVID-19 vaccines for local residents at the COVID-19 vaccination clinic in Pasadena, Los Angeles County, California, the United States, Aug. 19, 2021. (Xinhua)

A medical worker prepares the COVID-19 vaccines for local residents at the COVID-19 vaccination clinic in Pasadena, Los Angeles County, California, the United States, Aug. 19, 2021. (Xinhua)

Local residents come for the COVID-19 booster shots at the COVID-19 vaccination clinic in Los Angeles, the United States, Aug. 19, 2021. (Xinhua)