At Wuhan's Wansong community, disinfection workers knock on many doors to ensure the health of every resident. 

They are checking to see if anyone has a fever or is seriously ill.

They are dressed in full protective gear to prevent the spread of the virus, They often confirm information through closed doors with residents.

Due to a lack of elevators, workers often have to climb more than 10 floors to reach some households.

Disinfecting housing units is another part of the routine. The weight of disinfecting liquids and the cleaning leaves every worker sweat-soaked at the end of the day.