A health worker gives a shot of the Chinese Sinopharm COVID-19 vaccine to a woman at an inoculation site in Phnom Penh, Cambodia, May 1, 2021. (Photo by Ly Lay/Xinhua)

Residents in a high-risk area of COVID-19 infection queue to receive COVID-19 vaccines at an inoculation site in Phnom Penh, Cambodia, May 1, 2021. (Photo by Ly Lay/Xinhua)

A health worker pumps the Chinese Sinopharm COVID-19 vaccine with a syringe at an inoculation site in Phnom Penh, Cambodia, May 1, 2021. (Photo by Phearum/Xinhua)