A health worker fumigates a market in Sanaa, Yemen, on May 5, 2020. Yemen's health authorities confirmed nine new cases of COVID-19 and one more death, raising the total number to 21, including three deaths. (Photos: Mohammed Mohammed/Xinhua)

A health worker fumigates a market in Sanaa, Yemen, on May 5, 2020. Yemen's health authorities confirmed nine new cases of COVID-19 and one more death, raising the total number to 21, including three deaths.

People are seen in fumes by fumigation at a market in Sanaa, Yemen, on May 5, 2020. Yemen's health authorities confirmed nine new cases of COVID-19 and one more death, raising the total number to 21, including three deaths.

A health worker fumigates a market in Sanaa, Yemen, on May 5, 2020. Yemen's health authorities confirmed nine new cases of COVID-19 and one more death, raising the total number to 21, including three deaths.

A health worker fumigates a market in Sanaa, Yemen, on May 5, 2020. Yemen's health authorities confirmed nine new cases of COVID-19 and one more death, raising the total number to 21, including three deaths.