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Amazon Jungle

Scientists track how yellow fever raced through Brazil

The yellow fever virus lurked deep in the Amazon jungle until around July 2016 when it leapt toward the highly populated south of Brazil, carried by monkeys and the mosquitoes that liked to bite them. At a speed of about two miles (3.3 kilometers) per day, the virus made its way to the outskirts of the big cities of Sao Paulo and Rio de Janeiro, places it had not circulated in decades, and where more than 35 million people were not vaccinated against the illness. Two years later, 676 people were dead in the worst…