Table 1 Characteristics of symptomatic cases, asymptomatic subjects, and their close contacts in Hunan Province, China.

Characteristics	Symptomatic cases^a (n = 1019)	Asymptomatic subjects^a (n = 159)	Close contacts of cases with SARS-CoV-2 infections (n = 15,648)^b,c
Age, years
Median (interquartile range, IQR)	45 (34–55)	36 (19–52)	40 (27–52)
0–14	33 (3.2)	28 (17.6)	1706 (10.9)
15–64	849 (83.3)	119 (74.8)	11,662 (74.5)
≥65	137 (13.4)	12 (7.5)	1516 (9.7)
Missing	0 (0)	0 (0)	764 (4.9)
Sex
Male	526 (51.6)	75 (47.2)	7984 (51)
Female	493 (48.4)	84 (52.8)	7397 (47.3)
Missing	0 (0)	0 (0)	267 (1.7)
Exposure history^c
Residence in or travel history from Hubei Province	439 (43.1)	31 (19.5)	–
Contact with other confirmed cases or person with acute respiratory infections	366 (35.9)	90 (56.6)	–
Household contacts	–	–	2771 (17.7)
Relative contacts	–	–	7284 (46.5)
Social contacts	–	–	4550 (29.1)
Other close contacts^d	–	–	5709 (36.5)
Contact with person traveled to Hubei Province	616 (60.5)	71 (44.7)	–
Exposure not determined	296 (29.0)	48 (30.2)	–
Clinical severity
Asymptomatic subjects	–	159 (100)	104 (0.7)
Symptomatic subjects	1019 (100)	–	367 (2.4)
Mild patients	299 (29.3)	–	153 (1.0)
Moderate patients	570 (55.9)	–	174 (1.1)
Severe patients	119 (11.7)	–	31 (0.2)
Critical patients	31 (3.0)	–	9 (0.1)

Note: Data are presented as no. (%) of cases/contacts unless otherwise indicated.
^aAll symptomatic cases and asymptomatic subjects were PCR confirmed (see “Methods” section for the detailed definitions).
^bA total of 471 cases of SARS-CoV-2 infections were identified among 15,648 close contacts in Hunan province, which were also included in 1019 symptomatic COVID-19 cases and 159 subjects with asymptomatic SARS-CoV-2 infections.
^cPercentages may not total 100 as one individual may be associated with multiple observed exposures and contacts.
^dOther close contacts refer to caregivers and patients in the same ward, persons in the same transportation vehicle, and those providing service for the case in public places.

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