Epidemiologists & Virologists have made several claims about the coronaviurs -- one calls it 'novel' and declares that we have no immunity to it. The second compete on ‘modelling’ how many tens of millions would die. In episode 522 of ThePrint's #CutTheClutter, Shekhar Gupta picks up the thread from a renowned if provocative Swiss immunologist who uses his science to refute 'immunity deniers'.