For a second day in a row, the number of coronavirus patients released from South Korean hospitals has exceeded the number of newly confirmed infections, a potential sign that the country’s aggressive test-and-treatment approach is paying off.

Unlike China and Italy, which have locked down entire cities, South Korea has not blocked the movement of people in and out of regions heavily affected by the outbreak. Instead, it has launched an aggressive campaign of tracking, testing and treating patients, conducting more than 10,000 diagnostic tests a day.

Heath officials said it was still too early to say that the country’s outbreak was under control, but they were encouraged by the recent figures. The number of recovered patients surpassed that of new infections by 177 to 110 on Friday, and by 204 to 107 on Saturday.

The improvement was largely because of a sharp decline in the number of new patients in the Daegu, the epicenter of the outbreak and the focus of the testing campaign.