The World Health Organization (WHO) warned that there is no evidence that people who test positive for the new coronavirus are immunised and protected against reinfection.
The warning suggests that the issuance of “immune passports” may promote the spread of the pandemic.
There is currently no evidence that people who have recovered from #COVID-19 and have antibodies are protected from a second infection.
Some governments, wanting a gradual return to work and the resumption of economic activity, have put forward the idea of issuing documents attesting to the immunity of people on the basis of serological tests revealing the presence of antibodies in the blood.
At this point in the pandemic, there is not enough evidence about the effectiveness of antibody-mediated immunity to guarantee the accuracy of an “immunity passport” or “risk-free certificate.”
WHO believes that the serological tests currently used “need additional validation to determine their accuracy and reliability”.
In particular, the tests need to make it possible to distinguish the immune response to the novel coronavirus from the antibodies produced during an infection by another of the six known human coronaviruses, four of which are widespread, causing mild colds.