Study of Aggressive Covid-19 Strain in Brazil Suggests Limits of China Vaccine

Study of Aggressive Covid-19 Strain in Brazil Suggests Limits of China Vaccine

SÃO PAULO—As an aggressive coronavirus strain from the Amazon ravages Brazil, a preliminary study has provided the first evidence that the country’s principal vaccine, China’s CoronaVac, might not be as effective against it.

The small-scale study, which has yet to be peer-reviewed, comes as doctors warn of a humanitarian catastrophe in Brazil over coming weeks, with surging deaths as the disease overwhelms hospitals across the country.

Researchers from Br

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