Table 1.

Characteristics of COVID-19 Thai cases

Characteristics	Results
Number of COVID-19 cases	n = 60
Age (years)
Median (range)	38.5 (range 21–72)
Gender
Male	n = 36 (60%)
Risk factors
Confirmed case contact	n = 45 (75%): boxing stadiums (n = 11), karaoke bars&pubs (n = 14), workplaces (n = 1), taxi drivers (n = 1), family members and friends (n = 18)
Foreign contact	n = 8 (13.3%): UK (n = 5), China (n = 1), India (n = 1), Cambodia (n = 1)
Public area contact	n = 2 (3.3%): public market (n = 1), domestic travel (n = 1)
Unspecified	n = 5 (8.3%)
Diagnoses
Asymptomatic	n = 3 (5.0%)
URI	n = 37 (61.7%)
Fever	n = 11 (18.3%)
Pneumonia	n = 5 (8.3%)
Unspecified	n = 4 (6.7%)
Time from onset to laboratory test (days)
Median (range)	3 (range 0–14)
Results of RT-PCR assay
Ct-value of E
Mean ± SD (min, max)	22.79 ± 6.69 (min 10.49, max 35.02)
Ct-value of RdRp
Mean ± SD (min, max)	24.73 ± 6.55 (min 13.41, max 39.20)
Ct-value of N
Mean ± SD (min, max)	26.09 ± 6.47 (min 12.07, max 37.17)
Results of rapid antigen detection assay
Positive	59/60 (98.33%)
Negative	1/60 (1.67%)