Foreign visitors wearing face masks are seen on the street in Vientiane, Laos, March 23, 2020. Lao people have taken preventive measures against the COVID-19, despite there being no confirmed case of the virus infection in Laos. (Photos: Xinhua)

Foreign visitors wearing face masks are seen on the street in Vientiane, Laos, March 23, 2020. Lao people have taken preventive measures against the COVID-19, despite there being no confirmed case of the virus infection in Laos.

People wearing face masks ride motorbikes on the street in Vientiane, Laos, March 23, 2020. Lao people have taken preventive measures against the COVID-19, despite there being no confirmed case of the virus infection in Laos.

A man wearing face mask rides a bike on the street in Vientiane, Laos, March 23, 2020. Lao people have taken preventive measures against the COVID-19, despite there being no confirmed case of the virus infection in Laos.

People wearing face masks are seen on the street in Vientiane, Laos, March 23, 2020. Lao people have taken preventive measures against the COVID-19, despite there being no confirmed case of the virus infection in Laos.

People wearing face masks are seen on the street in Vientiane, Laos, March 23, 2020. Lao people have taken preventive measures against the COVID-19, despite there being no confirmed case of the virus infection in Laos.

People wearing face masks are seen on the street in Vientiane, Laos, March 23, 2020. Lao people have taken preventive measures against the COVID-19, despite there being no confirmed case of the virus infection in Laos.

People wearing face masks are seen on the street in Vientiane, Laos, March 23, 2020. Lao people have taken preventive measures against the COVID-19, despite there being no confirmed case of the virus infection in Laos.

Venders wearing face masks wait for customers along the street in Vientiane, Laos, March 23, 2020. Lao people have taken preventive measures against the COVID-19, despite there being no confirmed case of the virus infection in Laos.

People wearing face masks are seen on the street in Vientiane, Laos, March 23, 2020. Lao people have taken preventive measures against the COVID-19, despite there being no confirmed case of the virus infection in Laos.