Saturday 23 January 2021

A new Coronavirus strain rips through the Brazilian Amazonian city of Manaus, raising concerns about a greater risk of spread and already accounts for about half of new infections overwhelming its hospital system and exhausting oxygen supplies

A variant of the novel coronavirus already accounts for about half of new infections in the Brazilian Amazonian city of Manaus, raising concerns about a greater risk of spread, a researcher warned on Friday.

Credit CSSE.

A team led by immunologist Ester Sabino collected genomic data from COVID-19 tests in Manaus that indicated 42% of the confirmed cases were infected by the new variant, which has mutations similar to the British and South African variants. "That was the frequency that appeared in our December data. 
We are finishing January now and it is increasing," said Sabino, a University of Sao Paulo professor whose team's preliminary results have been published on the forum.

She said it was quite likely the new Brazilian variant is more transmissible than the current dominant strain, although it has not been proven definitively, because it has mutations shown to have that effect in other variants. The Amazon's largest city is currently suffering a brutal second wave of COVID-19 cases that has overwhelmed its hospital system and exhausted oxygen supplies, leaving dozens of people to die in their homes and intensive care wards, doctors say.

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Manaus has resisted lockdowns and social distancing is not enforced, but researchers believe the surge is also worsened by the new variant, which was first detected two weeks ago in Japan after four people travelled to the country from Manaus. "Everything points to this variant being behind the way the pandemic is evolving in Manaus," Sabino said. Sabino urged Brazilian health authorities to reinforce surveillance of the coronavirus outbreak in Manaus and its surrounding region, but also throughout Brazil.

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"This has to be monitored," she said. The new variant, identified as P.1, which has the N501Y and E484K mutations, was detected in 13 out of 31 positive PCR test samples collected in Manaus between Dec. 15-23. It was absent in genome surveillance samples seen between March and November, underscoring how quickly it has appeared and reproduced. Given the possibility of a more contagious form of coronavirus, the group called on the civil aviation authority to step up monitoring in major airports of passengers arriving from Manaus, an isolated Amazon city mainly accessible by aeroplane or boat.

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