FILE - In this Monday, March 29, 2021 file photo, numbers are handed out to people waiting to receive the AstraZeneca COVID-19 vaccine at Ndirande Health Centre in Blantyre Malawi. Some Africans are hesitating to get COVID-19 vaccines amid concerns about their safety, alarming public health officials as some countries start to destroy thousands of doses that expired before use. (AP Photo/Thoko Chikondi, File)

FILE - In this Wednesday, April 14, 2021 file photo, a medical team rolls a coronavirus patient from a bed onto a stretcher in the COVID-19 intensive care unit at Kenyatta National Hospital, in Nairobi, Kenya. Some Africans are hesitating to get COVID-19 vaccines amid concerns about their safety, alarming public health officials as some countries start to destroy thousands of doses that expired before use. (AP Photo/Brian Inganga, File)

FILE - In this Friday, March 5, 2021 file photo, a nurse holds a vial of AstraZeneca COVID-19 vaccine manufactured by the Serum Institute of India and provided through the global COVAX initiative, at Kenyatta National Hospital in Nairobi, Kenya. Some Africans are hesitating to get COVID-19 vaccines amid concerns about their safety, alarming public health officials as some countries start to destroy thousands of doses that expired before use. (AP Photo/Ben Curtis, File)

FILE - In this Friday, March 5, 2021 file photo, a Malawian policeman guards AstraZeneca COVID-19 vaccines after the shipment arrived at the Kamuzu International Airport in Lilongwe, Malawi. Some Africans are hesitating to get COVID-19 vaccines amid concerns about their safety, alarming public health officials as some countries start to destroy thousands of doses that expired before use. (AP Photo/Thoko Chikondi, File)

FILE - In this Friday, March 5, 2021 file photo, Uganda's Minister of Health Dr. Jane Ruth Aceng, center right, and other officials greet the country's first consignment of AstraZeneca COVID-19 vaccine manufactured by the Serum Institute of India and provided through the global COVAX initiative, at the airport in Entebbe, Uganda. Some Africans are hesitating to get COVID-19 vaccines amid concerns about their safety, alarming public health officials as some countries start to destroy thousands of doses that expired before use. (AP Photo/Nicholas Bamulanzeki, File)

FILE - In this Monday, March 29, 2021 file photo, a man prepares for his AstraZeneca COVID-19 vaccine at Ndirande Health Centre in Blantyre, Malawi. Some Africans are hesitating to get COVID-19 vaccines amid concerns about their safety, alarming public health officials as some countries start to destroy thousands of doses that expired before use. (AP Photo/Thoko Chikondi, File)