As the pandemic spreads around the world, new hotspots are emerging. Coronavirus is spiking in Brazil, Mexico, Peru and elsewhere, and health experts have called Latin America the new epicenter of the pandemic. But the impact has been uneven. Some countries have successfully slowed the rate of new infections; others see that rate continuing to climb. Jason Gale spoke with the World Health Organization’s top official for the Americas to find out what makes some populations especially vulnerable.