Workers prepare their equipment to spray disinfectants during a sterilization campaign in Sanaa, Yemen, March 25, 2020. Sanaa launched on Wednesday a sterilization campaign to prevent the spread of COVID-19. (Photo by Mohammed Mohammed/Xinhua)

Workers gather near trucks that spray disinfectants during a sterilization campaign in Sanaa, Yemen, March 25, 2020. Sanaa launched on Wednesday a sterilization campaign to prevent the spread of COVID-19. (Photo by Mohammed Mohammed/Xinhua)

Workers disinfect streets in Nur-Sultan, Kazakhstan, March 25, 2020. Kazakhstan has taken large-scale disinfection operations in several major cities. (Nur-Sultan City Government/Handout via Xinhua)

Workers disinfect streets in Nur-Sultan, Kazakhstan, March 25, 2020. Kazakhstan has taken large-scale disinfection operations in several major cities. (Nur-Sultan City Government/Handout via Xinhua)

Workers disinfect streets in Nur-Sultan, Kazakhstan, March 25, 2020. Kazakhstan has taken large-scale disinfection operations in several major cities. (Nur-Sultan City Government/Handout via Xinhua)

Workers disinfect streets in Nur-Sultan, Kazakhstan, March 25, 2020. Kazakhstan has taken large-scale disinfection operations in several major cities. (Nur-Sultan City Government/Handout via Xinhua)

Firefighters gather before disinfecting roads in Dhaka, Bangladesh, March 25, 2020. As part of the Bangladeshi government's various measures to contain the outbreak of COVID-19, firefighters in Dhaka on Wednesday sprayed disinfectant on the road. Bangladesh on Wednesday reported the country's fifth death related to COVID-19. (Str/Xinhua)

A firefighter sprays disinfectant on a road in Dhaka, Bangladesh, March 25, 2020. As part of the Bangladeshi government's various measures to contain the outbreak of COVID-19, firefighters in Dhaka on Wednesday sprayed disinfectant on the road. Bangladesh on Wednesday reported the country's fifth death related to COVID-19. (Str/Xinhua)

Firefighters spray disinfectant on a road in Dhaka, Bangladesh, March 25, 2020. As part of the Bangladeshi government's various measures to contain the outbreak of COVID-19, firefighters in Dhaka on Wednesday sprayed disinfectant on the road. Bangladesh on Wednesday reported the country's fifth death related to COVID-19. (Str/Xinhua)

Firefighters spray disinfectant on a road in Dhaka, Bangladesh, March 25, 2020. As part of the Bangladeshi government's various measures to contain the outbreak of COVID-19, firefighters in Dhaka on Wednesday sprayed disinfectant on the road. Bangladesh on Wednesday reported the country's fifth death related to COVID-19. (Str/Xinhua)

A staff member sprays disinfectant at Basantapur Durbar Square in Kathmandu, Nepal, March 25, 2020. Nepal on Wednesday confirmed the third infection, the Ministry of Health and Population said. The Nepali government has launched stringent measures, including the week-long lockdown nationwide, closure of all border points, suspension of all international flights and closure of offices except the emergency ones. (Photo by Sulav Shrestha/Xinhua)

A staff member sprays disinfectant at Basantapur Durbar Square in Kathmandu, Nepal, March 25, 2020. Nepal on Wednesday confirmed the third infection, the Ministry of Health and Population said. The Nepali government has launched stringent measures, including the week-long lockdown nationwide, closure of all border points, suspension of all international flights and closure of offices except the emergency ones. (Photo by Sulav Shrestha/Xinhua)

A staff member sprays disinfectant at Basantapur Durbar Square in Kathmandu, Nepal, March 25, 2020. Nepal on Wednesday confirmed the third infection, the Ministry of Health and Population said. The Nepali government has launched stringent measures, including the week-long lockdown nationwide, closure of all border points, suspension of all international flights and closure of offices except the emergency ones. (Photo by Sulav Shrestha/Xinhua)

Trucks spray disinfectants during a sterilization campaign in Sanaa, Yemen, March 25, 2020. Sanaa launched on Wednesday a sterilization campaign to prevent the spread of COVID-19. (Photo by Mohammed Mohammed/Xinhua)

Workers gather before spraying disinfectants during a sterilization campaign in Sanaa, Yemen, March 25, 2020. Sanaa launched on Wednesday a sterilization campaign to prevent the spread of COVID-19. (Photo by Mohammed Mohammed/Xinhua)

Workers spray disinfectants during a sterilization campaign in Sanaa, Yemen, March 25, 2020. Sanaa launched on Wednesday a sterilization campaign to prevent the spread of COVID-19. (Photo by Mohammed Mohammed/Xinhua)

Workers gather near trucks that spray disinfectants during a sterilization campaign in Sanaa, Yemen, March 25, 2020. Sanaa launched on Wednesday a sterilization campaign to prevent the spread of COVID-19. (Photo by Mohammed Mohammed/Xinhua)

Workers prepare their equipment to spray disinfectants during a sterilization campaign in Sanaa, Yemen, March 25, 2020. Sanaa launched on Wednesday a sterilization campaign to prevent the spread of COVID-19. (Photo by Mohammed Mohammed/Xinhua)