Table 1. COVID-19 testing criteria in four severely affected countries.

Country	Key points of COVID-19 testing criteria
USA	1. Hospitalized patients or healthcare facility workers with symptoms; 2. Patients with mild symptoms in communities experiencing high numbers of COVID-19 hospitalization; 3. Patients 65 years of age and older with symptoms or patients with underlying conditions with symptoms; 4. Patients with severe clinical symptoms who require hospitalization.
UK	1. A person who has either clinical or radiological evidence of pneumonia; 2. Who has acute respiratory distress syndrome; 3. Who has influenza-like illness of acute onset
Italy	1. Close contact with confirmed patients; 2. Or has travel history to high-risk epidemic areas or visits to hospitals or other high-risk areas; 3. Or is developing clinical symptoms.
The Republic of Korea	1. Suspected Case: A person who develops clinical symptoms within 14 days of coming into contact with a confirmed patient while the patient was showing symptoms; 2. A person who is suspected of having the COVID-19 virus as per doctor’s diagnosis due to pneumonia of unknown causes; 3. A person who develops clinical symptoms within 14 days of travelling to a country with local transmission of COVID-19; 4. A person with an epidemiologic link to the local COVID-19 outbreak and develops clinical symptoms within 14 days.