SARS in 2003 lasted for a total of 1 year and 8 months, with the most severe period being 8 months. The SARS outbreak started in Guangdong, China on November 16, 2002 with the first case in Shunde, Guangdong Province, in which the population was not immune to the SARS coronavirus, and spread rapidly to Southeast Asia and the world, with a total of 8,422 cases worldwide, involving 32 countries and regions. The number of patients diagnosed in China is 5327, and the number of deaths is 349. SARS is a severe acute respiratory syndrome.