Photo taken on June 8, 2021 shows packages of Chinese COVID-19 vaccines arriving at the Phnom Penh International Airport in Phnom Penh, Cambodia. Cambodia's COVID-19 vaccination drive has received another boost after the country got a new batch of Chinese vaccines on Tuesday. Cambodian health ministry's secretary of state Yok Sambath said the new arrival included Sinopharm vaccine donated by the Chinese government and those purchased from Chinese biopharmaceutical firm Sinovac Biotech. (Photo by Sovannara/Xinhua)

Photo taken on June 8, 2021 shows packages of Chinese COVID-19 vaccines arriving at the Phnom Penh International Airport in Phnom Penh, Cambodia. Cambodia's COVID-19 vaccination drive has received another boost after the country got a new batch of Chinese vaccines on Tuesday. Cambodian health ministry's secretary of state Yok Sambath said the new arrival included Sinopharm vaccine donated by the Chinese government and those purchased from Chinese biopharmaceutical firm Sinovac Biotech. (Photo by Phearum/Xinhua)

Airport workers unload packages of Chinese COVID-19 vaccines at the Phnom Penh International Airport in Phnom Penh, Cambodia, June 8, 2021. Cambodia's COVID-19 vaccination drive has received another boost after the country got a new batch of Chinese vaccines on Tuesday. Cambodian health ministry's secretary of state Yok Sambath said the new arrival included Sinopharm vaccine donated by the Chinese government and those purchased from Chinese biopharmaceutical firm Sinovac Biotech. (Photo by Sovannara/Xinhua)

A worker transports a package of Chinese COVID-19 vaccines at the Phnom Penh International Airport in Phnom Penh, Cambodia, June 8, 2021. Cambodia's COVID-19 vaccination drive has received another boost after the country got a new batch of Chinese vaccines on Tuesday. Cambodian health ministry's secretary of state Yok Sambath said the new arrival included Sinopharm vaccine donated by the Chinese government and those purchased from Chinese biopharmaceutical firm Sinovac Biotech. (Photo by Sovannara/Xinhua)

Photo taken on June 8, 2021 shows packages of Chinese COVID-19 vaccines arriving at the Phnom Penh International Airport in Phnom Penh, Cambodia. Cambodia's COVID-19 vaccination drive has received another boost after the country got a new batch of Chinese vaccines on Tuesday. Cambodian health ministry's secretary of state Yok Sambath said the new arrival included Sinopharm vaccine donated by the Chinese government and those purchased from Chinese biopharmaceutical firm Sinovac Biotech. (Photo by Sovannara/Xinhua)

Photo taken on June 8, 2021 shows packages of Chinese COVID-19 vaccines arriving at the Phnom Penh International Airport in Phnom Penh, Cambodia. Cambodia's COVID-19 vaccination drive has received another boost after the country got a new batch of Chinese vaccines on Tuesday. Cambodian health ministry's secretary of state Yok Sambath said the new arrival included Sinopharm vaccine donated by the Chinese government and those purchased from Chinese biopharmaceutical firm Sinovac Biotech. (Photo by Phearum/Xinhua)

A worker transports a package of Chinese COVID-19 vaccines at the Phnom Penh International Airport in Phnom Penh, Cambodia, June 8, 2021. Cambodia's COVID-19 vaccination drive has received another boost after the country got a new batch of Chinese vaccines on Tuesday. Cambodian health ministry's secretary of state Yok Sambath said the new arrival included Sinopharm vaccine donated by the Chinese government and those purchased from Chinese biopharmaceutical firm Sinovac Biotech. (Photo by Phearum/Xinhua)