Pharmacist Michael Witte, left, gives Neal Browning a shot in the first-stage study of a potential coronavirus vaccine on March 16 in Seattle. Countries and companies are racing to find a vaccine, with some describing the competition as ‘vaccine nationalism.’

Pharmacist Michael Witte, left, gives Neal Browning a shot in the first-stage study of a potential coronavirus vaccine on March 16 in Seattle. Countries and companies are racing to find a vaccine, with some describing the competition as ‘vaccine nationalism.’