A volunteer distributes a mask to a passenger at the Sants train station in Barcelona, Spain, April 15, 2020. Spain is handing out 10 million free masks from Monday to Thursday this week, to commuters going back to work after a two-week lockdown that forced all non-essential workers to stay home to combat the spread of COVID-19, the Ministry for Territorial Administration said on Tuesday. (Spanish Red Cross/Handout via Xinhua)

Volunteers wearing protective suits spray disinfectant on the compound of a mosque in an effort to curb the spread of COVID-19 in Islamabad, capital of Pakistan, April 15, 2020. (Xinhua/Ahmad Kamal)

A volunteer wearing a protective suit sprays disinfectant on the compound of a mosque in an effort to curb the spread of COVID-19 in Islamabad, capital of Pakistan, April 15, 2020. (Xinhua/Ahmad Kamal)

Volunteers wearing protective suits spray disinfectant at a slum in an effort to curb the spread of COVID-19 in Islamabad, capital of Pakistan, April 15, 2020. (Xinhua/Ahmad Kamal)

Palestinian artist Mais Abu Sa'a teaches in a lesson via webcam at home amid COVID-19 epidemic in the West Bank city of Nablus, April 15, 2020. (Photo by Ayman Nobani/Xinhua)

Palestinian artist Mais Abu Sa'a teaches in a lesson via webcam at home amid COVID-19 epidemic in the West Bank city of Nablus, April 15, 2020. (Photo by Ayman Nobani/Xinhua)

A Palestinian man is seen inside a disinfection chamber outside the door of a bakery in Gaza City, on April 15, 2020. Palestine on Wednesday said that 40 new cases of the COVID-19 were confirmed in its territory, bringing the total number to 369. (Photo by Rizek Abdeljawad/Xinhua)

A Palestinian man is seen inside a disinfection chamber outside the door of a bakery in Gaza City, on April 15, 2020. Palestine on Wednesday said that 40 new cases of the COVID-19 were confirmed in its territory, bringing the total number to 369. (Photo by Rizek Abdeljawad/Xinhua)

Palestinian workers wearing protective masks work at a bakery with a disinfection chamber in Gaza City, on April 15, 2020. Palestine on Wednesday said that 40 new cases of the COVID-19 were confirmed in its territory, bringing the total number to 369. (Photo by Rizek Abdeljawad/Xinhua)

Palestinian chef Raed Al-Afandi prepares lunch at a kitchen, designated by Palestinian Ministry of Health, for the quarantined people and the cases infected with the novel coronavirus, in the West Bank city of Bethlehem on April 15, 2020. (Photo by Luay Sababa/Xinhua)

Palestinian chef Raed Al-Afandi prepares lunch at a kitchen, designated by Palestinian Ministry of Health, for the quarantined people and the cases infected with the novel coronavirus, in the West Bank city of Bethlehem on April 15, 2020. (Photo by Luay Sababa/Xinhua)

A paramilitary soldier stands guard as a municipal worker sprays disinfectant at a market place against COVID-19 during lockdown as a precautionary measure in Jammu, the winter capital of Indian controlled Kashmir, April 15, 2020. (Str/Xinhua)

Doctors dressed in full protective suits during lockdown as a precautionary measure against COVID-19 in Jammu, the winter capital of Indian controlled Kashmir, April 15, 2020. (Str/Xinhua)

A worker makes protective masks during lockdown as a precautionary measure against COVID-19 in Jammu, the winter capital of Indian controlled Kashmir, April 15, 2020. (Str/Xinhua)