SÃO PAULO—Researchers and doctors are sounding the alarm over a new, more aggressive coronavirus strain from the Amazon area of Brazil, which they believe is responsible for a recent rise in deaths, as well as infections in younger people, in parts of South America.
Brazil’s daily death toll from the disease rose to its highest level yet this week, pushing the country’s total number of Covid-19 fatalities past a quarter of a million. On Tuesday, Brazil reported a record 1,641 Covid fatalities. Neighbor Peru is struggling to curb a second wave of infections.
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The new variant, known as P.1, is 1.4 to 2.2…