Table 2. Epidemiology of 56 suspected patients.

Epidemiology	n	%
1	30	53.6*
2	19	33.9#
3	7	12.5
4	0	0
Total	56	100

According to the 5th edition of National Health and Health Commission of People’s Republic of China’s 2019-nCoV-infected pneumonia diagnosis and treatment program. Epidemiology: 1, history of travel or residence in either Wuhan City and surrounding areas, or communities with confirmed COVID-19 cases within 14 days before the onset of symptoms; 2, direct person-to-person contact with confirmed COVID-19 infected individual (positive nucleic acid test) within 14 days before the onset of symptoms; 3, direct person-to-person contact with the patient with presenting symptoms of fever or respiratory infection from either Wuhan City and surrounding areas within 14 days before the onset of symptoms; 4, cluster onset. *, the proportion of standard 1 was higher than standard 2,3,4, P<0.05; ^#, the proportion of standard 2 was higher than standard 3 and 4, P<0.01.