People wait in line at a mobile COVID-19 vaccination center in the Brooklyn borough of New York, the United States, Aug. 18, 2021. The United States will begin administrating COVID-19 booster shots next month as new data shows that vaccine protection wanes over time, top U.S. health officials announced Wednesday. According to the CDC, 72.2 percent of American adults have received one dose of COVID-19 vaccine, with 61.8 percent being fully vaccinated. (Xinhua/Michael Nagle)

A medical worker enters a mobile COVID-19 vaccination center in the Brooklyn borough of New York, the United States, Aug. 18, 2021. The United States will begin administrating COVID-19 booster shots next month as new data shows that vaccine protection wanes over time, top U.S. health officials announced Wednesday. According to the CDC, 72.2 percent of American adults have received one dose of COVID-19 vaccine, with 61.8 percent being fully vaccinated. (Xinhua/Michael Nagle)

A man enters an observation area after receiving a COVID-19 vaccination at a mobile vaccination center in the Brooklyn borough of New York, the United States, Aug. 18, 2021. The United States will begin administrating COVID-19 booster shots next month as new data shows that vaccine protection wanes over time, top U.S. health officials announced Wednesday. According to the CDC, 72.2 percent of American adults have received one dose of COVID-19 vaccine, with 61.8 percent being fully vaccinated. (Xinhua/Michael Nagle)

Placards display signage for Johnson & Johnson and Pfizer COVID-19 vaccinations at a mobile COVID-19 vaccination center in the Brooklyn borough of New York, the United States, Aug. 18, 2021. The United States will begin administrating COVID-19 booster shots next month as new data shows that vaccine protection wanes over time, top U.S. health officials announced Wednesday. According to the CDC, 72.2 percent of American adults have received one dose of COVID-19 vaccine, with 61.8 percent being fully vaccinated. (Xinhua/Michael Nagle)

People wait in line at a mobile COVID-19 vaccination center in the Brooklyn borough of New York, the United States, Aug. 18, 2021. The United States will begin administrating COVID-19 booster shots next month as new data shows that vaccine protection wanes over time, top U.S. health officials announced Wednesday. According to the CDC, 72.2 percent of American adults have received one dose of COVID-19 vaccine, with 61.8 percent being fully vaccinated. (Xinhua/Michael Nagle)