Islamabad, July 8 -- Boxes of surgical masks, bottles of disinfectant and a sign saying "Please wear a mask" mark the entrance to a public gym in Yatsushiro city, a shelter for residents fleeing devastating floods in southwestern Japan this week.

Elsewhere in the gym, cardboard partitions separate the 233 evacuees' sleeping areas and another sign instructs them to check their temperature each morning, then sterilise the thermometers.

The measures show what a thorny issue it is for Japan to deal with natural disasters in the time of coronavirus.

Japanese authorities have been warning local officials for months to include coronavirus measures in their disaster preparations.

Residents have been urged to seek shelter with friends or relativ...