Two patients in China that recovered from Covid-19 months ago tested positive for the coronavirus again, raising concern of the virus’s ability to linger and reactivate in people who it previously infected. A 68-year-old woman in the central Chinese province of Hubei, where the novel coronavirus first surfaced in December, tested positive on Sunday, six months after she was diagnosed with Covid-19 and recovered. Another man found to have contracted the disease in April after returning from abroad tested positive in Shanghai on Monday but hasn’t shown any symptoms.
None of the patients’ close contacts has tested positive for the virus, but they have been placed under quarantine, local authorities said.
