The novel coronavirus is a brand new coronavirus, and there are already more than 50 known coronaviruses, six of which are relevant to humans, and seven if we add the novel coronavirus pneumonia. The four most common of these seven species cause the common cold. It is possible that 10-20% of the common cold population is caused by common coronavirus infection each year. The new coronavirus that emerged at the end of 2019 is more similar to SARS, but is a completely new virus that is more contagious and still causes fever, cough, and malaise as the main symptoms, and very few people may become heavy cases and critical cases that can be life-threatening. Due to its strong contagiousness, 100,000 patients have appeared worldwide, and the next step is still to continue to do a good job of strict preventive and control measures by controlling the source of infection and cutting off the transmission channels for good protection. Content source: Dr. You Lai