Though South Korea is sometimes portrayed as having averted an epidemic, thousands of people were infected and the government was initially accused of complacency. Its approach to testing was designed to turn back an outbreak already underway.

To spare hospitals and clinics from being overwhelmed, officials opened 600 testing centers designed to screen as many people as possible, as quickly as possible — and keep health workers safe by minimizing contact.

At 50 drive-through stations, patients are tested without leaving their cars. They are given a questionnaire, a remote temperature scan and a throat swab. The process takes about 10 minutes. Test results are usually back within hours.

At some walk-in centers, patients enter a chamber resembling a transparent phone booth. Health workers administer throat swabs using thick rubber gloves built into the chamber’s walls.