A man sits in front of a closed store in the southern port city of Aden, Yemen, March 24, 2020. Hundreds of shops and other businesses began on Tuesday closing their doors as part of precautionary measures to curb the potential coronavirus outbreak in Yemen's southern port city of Aden. (Photo by Murad Abdo/Xinhua)

A pedestrian passes closed stores in the southern port city of Aden, Yemen, March 24, 2020. Hundreds of shops and other businesses began on Tuesday closing their doors as part of precautionary measures to curb the potential coronavirus outbreak in Yemen's southern port city of Aden. (Photo by Murad Abdo/Xinhua)

A pedestrian passes closed stores in the southern port city of Aden, Yemen, March 24, 2020. Hundreds of shops and other businesses began on Tuesday closing their doors as part of precautionary measures to curb the potential coronavirus outbreak in Yemen's southern port city of Aden. (Photo by Murad Abdo/Xinhua)

A man sits in front of a closed store in the southern port city of Aden, Yemen, March 24, 2020. Hundreds of shops and other businesses began on Tuesday closing their doors as part of precautionary measures to curb the potential coronavirus outbreak in Yemen's southern port city of Aden. (Photo by Murad Abdo/Xinhua)

Pedestrians pass closed stores in the southern port city of Aden, Yemen, March 24, 2020. Hundreds of shops and other businesses began on Tuesday closing their doors as part of precautionary measures to curb the potential coronavirus outbreak in Yemen's southern port city of Aden. (Photo by Murad Abdo/Xinhua)

People are seen in front of a closed store in the southern port city of Aden, Yemen, March 24, 2020. Hundreds of shops and other businesses began on Tuesday closing their doors as part of precautionary measures to curb the potential coronavirus outbreak in Yemen's southern port city of Aden. (Photo by Murad Abdo/Xinhua)