Enlarge / Medical staff transport patients of a sanatorium where mass coronavirus infections occurred to hospital in Daegu, South Korea, March 19, 2020. (credit: Getty | Lee Sang-ho | Xinhua News Agency)

People who recover from COVID-19 but test positive for the virus again days or weeks later are not shedding viral particles and are not infectious, according to data released Tuesday by the Korea Centers for Disease Control and Prevention.

The so-called “re-positive” cases have raised fears that an infection with the new coronavirus, SARS-CoV-2, could “reactivate” in recovered patients, or that recovering from the infection may fail to produce even short-lived immunity, allowing patients to immediately become re-infected if they are exposed.

The new data from Korea should ease those concerns.