A woman in protective suit passes by a disinfection tent before she enters the departure area of Manila's International Airport, Philippines on Friday, May 22, 2020. Some airlines began flights in and out of the country as the capital eases it's lockdown while it continues to fight the spread of the new coronavirus. (AP Photo/Aaron Favila)

FILE - In this Thursday, Feb. 20, 2020 file photo, a view of the AstraZeneca logo, on a building, in South San Francisco, Calif. Drug maker AstraZeneca secured its first agreements Thursday, May 21, 2020 for 400 million doses of a COVID-19 vaccine, bolstered by an investment from the U.S. vaccine agency. (AP Photo/Jeff Chiu, File)

Office workers wearing face masks to help curb the spread of the coronavirus head to worlplaces in Bangkok, Thailand, Thursday, May 21, 2020. Thai health officials say scientists in Thailand have had promising results in testing a COVID-19 vaccine candidate on mice, and will begin testing it on monkeys next week.(AP Photo/Sakchai Lalit)