The source of the novel coronavirus is still unknown for now. There are hundreds of viruses in bats, once Ebola, SARS, and Middle East Respiratory Syndrome, all viruses from bats. 2019 novel coronavirus pneumonia outbreak has many similarities with the 2002 SARS outbreak in Guangdong, both occurred in winter, out of the beginning of the occurrence of both originated from human contact with fresh animals traded in animal markets, and both were caused by unknown coronavirus pathogens.