Staff members of Centers for Disease Control and Prevention (CDC) attend the World AIDS Day commemorations in Lusaka, capital of Zambia, on Dec. 1, 2020. Zambia on Tuesday joined the rest of the world in commemorating the World AIDS Day with President Edgar Lungu pledging his government's commitment to ending the HIV/AIDS epidemic by 2030. (Photo by Martin Mbangweta/Xinhua)

A mobile station for free AIDS testing and screening services is seen during the World AIDS Day commemorations in Lusaka, capital of Zambia, on Dec. 1, 2020. Zambia on Tuesday joined the rest of the world in commemorating the World AIDS Day with President Edgar Lungu pledging his government's commitment to ending the HIV/AIDS epidemic by 2030. (Photo by Martin Mbangweta/Xinhua)

People attend the World AIDS Day commemorations in Lusaka, capital of Zambia, on Dec. 1, 2020. Zambia on Tuesday joined the rest of the world in commemorating the World AIDS Day with President Edgar Lungu pledging his government's commitment to ending the HIV/AIDS epidemic by 2030. (Photo by Martin Mbangweta/Xinhua)

People line up to access child health service during the World AIDS Day commemorations in Lusaka, capital of Zambia, on Dec. 1, 2020. Zambia on Tuesday joined the rest of the world in commemorating the World AIDS Day with President Edgar Lungu pledging his government's commitment to ending the HIV/AIDS epidemic by 2030. (Photo by Martin Mbangweta/Xinhua)

People attend the World AIDS Day commemorations in Lusaka, capital of Zambia, on Dec. 1, 2020. Zambia on Tuesday joined the rest of the world in commemorating the World AIDS Day with President Edgar Lungu pledging his government's commitment to ending the HIV/AIDS epidemic by 2030. (Photo by Martin Mbangweta/Xinhua)

People attend the World AIDS Day commemorations in Lusaka, capital of Zambia, on Dec. 1, 2020. Zambia on Tuesday joined the rest of the world in commemorating the World AIDS Day with President Edgar Lungu pledging his government's commitment to ending the HIV/AIDS epidemic by 2030. (Photo by Martin Mbangweta/Xinhua)

A man poses for a photo during the World AIDS Day commemorations in Lusaka, capital of Zambia, on Dec. 1, 2020. Zambia on Tuesday joined the rest of the world in commemorating the World AIDS Day with President Edgar Lungu pledging his government's commitment to ending the HIV/AIDS epidemic by 2030. (Photo by Martin Mbangweta/Xinhua)