A health worker conducts COVID-19 tests at a newly set up polymerase chain reaction (PCR) testing laboratory at the Bandaranaike International Airport in Katunayake, Sri Lanka, July 10, 2020. The new laboratory to conduct PCR tests was declared open at the Bandaranaike International Airport on July 9, with a capacity of conducting 500 tests daily. (Photo by Ajith Perera/Xinhua)

Health workers conduct COVID-19 tests at a newly set up polymerase chain reaction (PCR) testing laboratory at the Bandaranaike International Airport in Katunayake, Sri Lanka, July 10, 2020. The new laboratory to conduct PCR tests was declared open at the Bandaranaike International Airport on July 9, with a capacity of conducting 500 tests daily. (Photo by Ajith Perera/Xinhua)

Health workers conduct COVID-19 tests at a newly set up polymerase chain reaction (PCR) testing laboratory at the Bandaranaike International Airport in Katunayake, Sri Lanka, July 10, 2020. The new laboratory to conduct PCR tests was declared open at the Bandaranaike International Airport on July 9, with a capacity of conducting 500 tests daily. (Photo by Ajith Perera/Xinhua)