While yellow fever is often asymptomatic in humans, patients who develop severe symptoms can die within seven to 10 days. Brazilian authorities estimate that over 4,400 monkeys have died from yellow fever in recent months; subspecies like southern brown howler monkeys are especially vulnerable. The last confirmed urban outbreak of yellow fever in the Americas was previously thought to be during the 1940s. PhotoAs the authorities grapple anew with yellow fever in Brazil, they are voicing relief that it has not evolved into an urban outbreak. Still, in impoverished parts of Brazil where yellow fever has hit hard, some say that the authorities have been slow to act.

Source: New York Times May 02, 2017 19:20 UTC