Health workers analyze samples collected during mass coronavirus testing inside a mobile laboratory in Jakarta, Indonesia, Thursday, June 18, 2020. (AP Photo/Achmad Ibrahim)

A volunteer sprays disinfectant outside a provincial assembly building to help contain the spread of the coronavirus, in Peshawar, Pakistan, Thursday, June 18, 2020. (AP Photo/Muhammad Sajjad)

People walk in a popular street, in Ankara, Turkey, Wednesday, June 17, 2020. Turkey has made the wearing of face masks mandatory in five more provinces, following an uptick in COVID-19 cases. Health Minister Fahrettin Koca tweeted Tuesday that the wearing of masks is now compulsory in 42 of Turkey's 81 provinces.(AP Photo/Burhan Ozbilici)

In this Wednesday, June 17, 2020, workers disinfect boxes of medical supplies on arrival at Sanaa International Airport in Sanaa, Yemen. The shipment includes ventilators, coronavirus test kits, PCR machines and personal protective equipment. Organized by the United Nations and private companies, it comes as the UN is facing a funding shortage for its operations in the war-torn country, where officials and medical experts fear the coronavirus could be spreading unchecked due to limited medical facilities. (World Health Organization via AP)

Russian President Vladimir Putin, left, listens to Yury Chikhanchin, head of Russia's Federal Financial Monitoring Service (Rosfinmonitoring) during their meeting at the Kremlin in Moscow, Russia, Thursday, June 18, 2020. (Alexei Nikolsky, Sputnik, Kremlin Pool Photo via AP)

Members of the South Korean military band wearing face masks to help protect against the spread of the new coronavirus cross a road during an event to commemorate the upcoming 70th anniversary of the Korean War, in Seoul, South Korea, Monday, June 15, 2020. (AP Photo/Ahn Young-joon)

Residents wearing face masks to curb the spread of the coronavirus hold up paper bags to protect against the rain in Beijing on Thursday, June 18, 2020. A new coronavirus outbreak in Beijing saw a decline in daily cases Thursday while the United States increased pressure on China's leaders to reveal what they know about the pandemic. (AP Photo/Ng Han Guan)

Residents wear masks to curb the spread of the new coronavirus on a street of Beijing on Thursday, June 18, 2020. China's capital Beijing reported a decline in newly confirmed cases of coronavirus Thursday as the city continued to press stricter measures to contain a new outbreak. (AP Photo/Ng Han Guan)

An Indigenous child puts on a mask to curb the spread of the new coronavirus while walking with his mother through the fields in Cayambe, Ecuador, Wednesday, June 17, 2020. Indigenous communities in Ecuador have implemented their security methods to prevent the virus from entering their lands, especially since they do not have health centers that can take care of them if the disease becomes serious. (AP Photo/Dolores Ochoa)

Parents wearing protective masks wait to register their newly-born child at the Home Affairs offices in Cape Town, South Africa, Wednesday June 17, 2020. The country now has more than a quarter of the coronavirus cases on the 54-nation African continent with more than 73,000 cases after new, record-high infections were registered in South Africa over the weekend. (AP Photo/Nardus Engelbrecht)

Visitors wearing face masks to prevent the spread of the new coronavirus, attend a reopening ceremony at the Hong Kong Disneyland on Thursday, June 18, 2020. Hong Kong Disneyland on Thursday opened its doors to visitors for the first time in nearly five months, at a reduced capacity and with social distancing measures in place. The theme park closed temporarily at the end of January due to the coronavirus outbreak, and is the second Disney-themed park to re-open worldwide, after Shanghai Disneyland. (AP Photo/Kin Cheung)

Customers stand in an elevator with the floor demarcated with social distancing stickers during a relaxation of the COVID-19 lockdown rules, at the El Recreo mall in Caracas, Venezuela, Wednesday, June 17, 2020. (AP Photo/Matias Delacroix)

Patricia Cruz Castillo, 28, accepts a bag of donated food and household items brought by Luis Gutierrez of De La Mano Hacemos Mas (Spanish for Hand In Hand We Accomplish More), in Piedra Grande, Huixquilucan, Mexico State, Wednesday, June 17, 2020. Though the hillside community has so far felt isolated from the virus that causes COVID-19, the economic effects are widespread, with many inhabitants having lost their jobs in construction, farming, domestic work, and businesses that have been forced to close. (AP Photo/Rebecca Blackwell)

Sex workers wear masks and rains coats during a protest asking the government to ease coronavirus lockdown restrictions in La Paz, Bolivia, Wednesday, June 17, 2020. (AP Photo/Juan Karita)

A man wearing a mask to help curb the spread od the new coronavirus is reflected in the mirror of his motorcycle in Cariacu, Ecuador, Wednesday, June 17, 2020. (AP Photo/Dolores Ochoa)

FILE - In this March 16, 2020, file photo, a patient receives a shot in the first-stage safety study clinical trial of a potential vaccine for COVID-19 at the Kaiser Permanente Washington Health Research Institute in Seattle. As the race for a vaccine against the new coronavirus intensifies, many rich countries are rushing to the front of the line by placing advance orders for the inevitably limited supply to guarantee their citizens are immunized first. (AP Photo/Ted S. Warren, File)