AdvertisementWHO Says COVID-19 Immunity Is An Unknown; Disease '10 Times Deadlier' Than 2009 FluApril 13, 2020Bill ChappellfacebookEmailHealth experts say they're not yet sure about the level of immunity people may have after recovering from COVID-19. Here, a man wears a protective mask as he passes a mural in New York City, where the COVID-19 death toll has passed 10,000. (AFP via Getty Images)