Though 76 per cent of people in Manaus, Brazil have covid-19 antibodies, the virus is spreading quickly – potentially fuelled by a new variant – which may mean herd immunity by infection is not possible

By Luke Taylor
Oxygen supplies have run out in hospitals in Manaus, Brazil, so people are buying cylinders from private companies to use at home
REUTERS/Bruno Kelly
Hospitals in the Brazilian Amazon are collapsing once again under the strain of treating covid-19 patients. This is despite the high rate of coronavirus infections in Amazonas during the first wave of the virus, and suggests that if herd immunity by infection is possible, it may be harder to achieve than previously thought.
In Manaus, the capital of Amazonas, hospital beds are unavailable. People are queuing to buy oxygen tanks from private suppliers to attempt to …