[ad_1]
GENEVA (BLOOMBERG) – Catching Covid-19 once may not protect you from getting it again, according to the World Health Organization, a finding that could jeopardise efforts to allow people to return to work after recovering from the coronavirus.
“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 a statement on April 24.
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.
People issued such a certificate could ignore public health guidance, increasing the risk of the disease spreading further.
Chile was the first country to announce plans to issue immunity cards based partly on antibody tests.
This has raised concerns because the tests have proceed unreliable elsewhere, and some people may get deliberately ill in order to obtain the card.
The United States and others have nonetheless said they’re looking into the option.
While there’s a consensus that the key to ending the coronavirus pandemic is establishing so-called herd immunity, there are many unknowns.
One is whether researchers can develop a safe and effective vaccine. Another is how long people who have recovered have immunity; reinfection after months or years is common with other human coronaviruses.
Finally, it’s not clear what percentage of people must be immune to protect the “herd.” That depends on the contagiousness of the virus.
The WHO said it is reviewing the scientific evidence on antibody responses to coronavirus, but as yet no study has evaluated whether the presence of antibodies “confers immunity to subsequent infection by this virus in humans.”
And while many countries are currently testing for antibodies, these studies are not designed to determine whether people recovered from the disease acquire immunity, the agency said.
As the hunt for a vaccine continues around the world, the WHO has formed an international alliance to ensure that treatments are fairly distributed.
French President Emmanuel Macron, European Commission President Ursula von der Leyen as well as the Bill and Melinda Gates Foundation are involved in the alliance.
[ad_2]
