Some Recovered Coronavirus Patients In Wuhan Are Testing Positive Again

NPR is reporting that some Wuhan residents in China who had tested positive earlier and then recovered from the disease are testing positive for the virus a second time. It’s raising concerns of a possible second wave of cases, as China prepares to lift quarantine measures to allow residents to leave the epicenter of its outbreak next month. From the report: Based on data from several quarantine facilities in the city, which house patients for further observation after their discharge from hospitals, about 5%-10% of patients pronounced “recovered” have tested positive again. Some of those who retested positive appear to be asymptomatic carriers — those who carry the virus and are possibly infectious but do not exhibit any of the illness’s associated symptoms — suggesting that the outbreak in Wuhan is not close to being over. NPR has spoken by phone or exchanged text messages with four individuals in Wuhan who are part of this group of individuals testing positive a second time in March. All four said they had been sickened with the virus and tested positive, then were released from medical care in recent weeks after their condition improved and they tested negative. One of the Wuhan residents who spoke to NPR exhibited severe symptoms during their first round of illness and was eventually hospitalized. The second resident displayed only mild symptoms at first and was quarantined in one of more than a dozen makeshift treatment centers erected in Wuhan during the peak of the outbreak. But when both were tested a second time for the coronavirus on Sunday, March 22, as a precondition for seeking medical care for unrelated health issues, they tested positive for the coronavirus even though they exhibited none of the typical symptoms, such as a fever or dry cough. The time from their recovery and release to the retest ranged from a few days to a few weeks. One theory is that they were first given a false negative test result. Another theory is that, because the test amplifies tiny bits of DNA, residual virus from the initial infection could have falsely resulted in that second positive reading.