Table 1.
Characteristics of symptomatic cases, asymptomatic subjects, and their close contacts in Hunan Province, China.
| Characteristics | Symptomatic casesa (n = 1019) | Asymptomatic subjectsa (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 historyc | |||
| 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 contactsd | – | – | 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.