Transparent panels are set up to separate diners in a Hong Kong restaurant, on Feb 25, 2020. [Photo by Calvin Ng/chinadaily.com.cn]

A woman wearing a homemade face mask shops at a supermarket in Hong Kong, on March 4, 2020. [Photo by Calvin Ng/chinadaily.com.cn]

A staff member takes a customer's temperature at a store in Hong Kong, on Feb 26, 2020. [Photo by Calvin Ng/chinadaily.com.cn]

People buy food at a market in Hong Kong, on Feb 27, 2020. [Photo by Calvin Ng/chinadaily.com.cn]

Passengers wearing masks wait for a tram at a station in Hong Kong, on Feb 26, 2020. [Photo by Calvin Ng/chinadaily.com.cn]

Passengers wear masks on a bus in Hong Kong, on Feb 27, 2020. [Photo by Calvin Ng/chinadaily.com.cn]

Hong Kong residents wearing masks exercise at a park, on Feb 25, 2020. [Photo by Calvin Ng/chinadaily.com.cn]