A medical worker prepares inhalable COVID-19 vaccine doses at a community health service center in Tianxin District of Changsha, central China's Hunan Province, Dec. 22, 2022. Inhalable COVID-19 vaccines are available at many vaccine sites in Changsha now as the epidemic continues to rage.

A medical worker (L) instructs a resident to receive inhalable COVID-19 vaccine at a community health service center in Tianxin District of Changsha, central China's Hunan Province, Dec. 22, 2022. Inhalable COVID-19 vaccines are available at many vaccine sites in Changsha now as the epidemic continues to rage.

A resident (R) receives a dose of inhalable COVID-19 vaccine at a community health service center in Tianxin District of Changsha, central China's Hunan Province, Dec. 22, 2022. Inhalable COVID-19 vaccines are available at many vaccine sites in Changsha now as the epidemic continues to rage.