11 February 202011.55 Two or three months to test a 2019-nCov vaccine against coronavirus: announces Anthony Fauci, one of the most famous immunologists in the world and director of Niaid, the US institute for the study of infectious diseases. The vaccine will be administered to a small group of people, to verify its safety. Speaking of the methods of contagion, Fauci says that it is possible to hypothesize the asymptomatic transmission, that is, before signs of contagion occur, while most viruses are transmitted when someone has symptoms.