Before the novel coronavirus was not found in humans, there were six main coronaviruses found in humans, in which two strains of coronaviruses had a greater impact on humans, one was SARS in 2003, and another was MERS, and this time the novel coronavirus that emerged was the seventh coronavirus in humans, and current studies believe that it exists in wild animals, such as bats, in wild animals The transmission of the coronavirus from animal to human occurred, and then the transmission between human and human occurred, resulting in the novel coronavirus pneumonia. Because humans are not immune to the novel coronavirus, novel coronavirus pneumonia has occurred in a significant group of people. The clinical presentation is dominated by fever, dry cough, and malaise. Upon arrival at the hospital, blood tests mainly show normal or slightly decreased white blood cells, progressive decrease in lymphocytes, and gross glassy changes in both lungs on chest radiograph or lung CT. The clinical diagnosis of this new coronavirus is currently confirmed by nucleic acid testing. Content source: Dr. You Lai