Catching Covid-19 once may not protect you from getting it again, according to the World Health Organization, a finding that could jeopardize efforts to allow people to return to work after recovering from the virus. “There is currently no evidence that people who have recovered from Covid-19 and have antibodies are protected from a second infection," the United Nations agency said in an April 24 statement.
The WHO guidance came after some governments suggested that people who have antibodies to the coronavirus could be issued an “immunity passport" or “risk-free certificate" that would allow them to travel or return to work, based on the assumption that they were safe from re-infection, according to the statement.