My boyfriend tested positive for COVID in April .. he been self quarantine & he been taking care of himself. He went & got tested 2 weeks ago & he was negative. He got tested again 1 week ago & the results were negative. Does that mean he’s okay.? Can the virus just reappear on its own or it doesn’t work that way..I read in China people are infected again after being released from the hospital even when they claim they were “Quarantined at home”