27/07/2020Sociedad The New York Times - Estados Unidos Salud Denise Grady
17:30 - The study aims to enroll 30,000 people this summer and determine whether the vaccine is safe and effective, possibly by November.
22/01/2020Sociedad The New York Times - Estados Unidos Sociedad Denise Grady
16:12 - Epidemics of related viruses, like SARS, killed hundreds. But the W.H.O. has postponed a decision on whether the new outbreak is a global emergency.