It’s still not clear whether the virus can be transmitted from human to human. It started as a few cases of pneumonia in workers at a fish market in central China. Now a new virus has the world on alert. Late last month, doctors began seeing a new type of viral pneumonia — fever, cough, difficulty breathing — in people who worked at or visited a seafood market in the suburbs of Wuhan in China . Since then, more than 200 cases have been reported and three people have died. Thailand last week reported two cases of Chinese visitors carrying a strain of the virus , and Japan reported its first case of the infection on Thursday after a Japanese man returned from visiting Wuhan. So what do we know about the novel coronavirus , or 2019-nCoV , and how worried should we be? What is a coronavirus? A […]