The US is also tracking infections in people who have been fully vaccinated, Rochelle Walensky, director of the US Centres of Disease Control and Prevention told the House subcommittee hearing.
Of 77 million people vaccinated in the US, there have been 5800 such breakthrough infections, Dr Walensky said, including 396 people who required hospitalisation and 74 who died.
Dr Walensky said some of these infections had occurred because the vaccinated person did not mount a strong immune response. But the concern is that in some cases, they are occurring in people infected by more contagious virus variants.
Earlier this month, Pfizer and partner BioNTech said their vaccine was around 91 per cent effective in preventing COVID-19, citing updated trial data that included more than 12,000 people fully inoculated for at least six months.
Reuters
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2021-04-16 01:02:00Z
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