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READ MORE: Scientists still think reinfections are fairly rare and usually less serious than initial ones, but recent developments around the world have raised concerns. In South Africa, a vaccine study found new infections with a variant in two per cent of people who previously had an earlier version of the virus. In Brazil, several similar cases were documented with a new variant there. Researchers are exploring whether reinfections help explain a recent surge in the city of Manaus, where three-fourths of residents were thought to have been previously infected. In the United States, a study found that 10 per cent of Marine recruits who had evidence of prior infection and repeatedly tested negative before starting basic training were later infected again.

Sao pauloNew yorkUnited statesUnited kingdomNossa senhora aparecidaWhite houseDistrict of columbiaSouth africaCity ofSouth africanShabir madhiJeff zientsStuart sealfonHoward bauchnerAnthony fauciAbilio ribeiro