Variables    n  %
Gender
Male  15  53.6
Female  13  46.4
Age (y)
20–29  6  21.4
30–39  6  21.4
40–49  6  21.4
50–59  8  28.6
60–69  1  3.6
70–79  1  3.6
Nationality
Korean  22  78.6
Chinese  6  21.4
Signs and Symptoms at onset (may be duplicated)
Fever  9  32.1
Sore Throat  9  32.1
Cough or Sputum  5  17.9
Chills  5  17.9
Muscle ache  4  14.3
Generalized weakness  3  10.7
Headache  3  10.7
Asymptomatic infection or Unknown*  3  10.7
Pneumonia after admission
Pneumonia  18  64.3