evidence: Although the two viruses belong to the same species, SARS-CoV-2 spreads much faster than SARS-CoV but is less deadly, says Shibo Jiang, a virologist at Fudan University in Shanghai. SARS-CoV retreated in the summer, but nobody knows what the new virus will do in the coming months, he says. People might think it will behave similarly and stop taking precautions come summer. [...] Sun Caijun, an infectious-disease researcher also at Sun Yat-sen University, says that he would have preferred the virus be named clustered acute respiratory syndrome coronavirus (CARS-CoV) or rapid spread respiratory syndrome coronavirus (RARS-CoV), given the virus’s quick spread. [...] Officials want to know but predictions vary wildly, from now to after hundreds of millions of people are infected.