A health worker examines a man's temperature as he enters a civil institute in Sanaa, Yemen, on April 28, 2020. (Photos: Xinhua)

Yemeni men wear masks as a precautionary measure against the spread of the novel coronavirus, in Sanaa, Yemen, on April 28, 2020.

A traffic policeman wearing a mask works on a street in Sanaa, Yemen, on April 28, 2020.

Yemeni men wear masks as a precautionary measure against the spread of the novel coronavirus, in Sanaa, Yemen, on April 28, 2020.