Those who thought getting the coronavirus once was bad enough may not be comforted by new research from South Korea. Jeong Eun-kyeong, the director of South Korea's Centers for Disease Control and Prevention, warned on Monday that the coronavirus may be able to reactivate in people who have been "cured" of the disease because 51 patients tested positive for the virus after being discharged with negative results. “While we are putting more weight on reactivation as the possible cause, we are conducting a comprehensive study on this,” Jeong said. “There have been many cases when a patient during treatment will...