WHO warns you may catch virus again

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 a 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 reinfection, according to the statement, issued Friday. People given 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 proven unreliable elsewhere, and some people may get deliberately ill in order to obtain the card. The U.S. 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’ve 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’s 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 aren’t 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 distributed fairly. French President Emmanuel Macron, European Commission President Ursula von der Leyen and the Bill and Melinda Gates Foundation are involved in the alliance.

Tribune Wire

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(1) comment

Holmes -- the real one

" “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."

It has already been demonstrated that many (perhaps not all) persons who are infected with Covid-19 mount an antibody response. We still have no idea how long those antibodies persist and no idea whether having been infected and recovered is protective against being re-infected.

There are many viral infections that do no confer lasting immunity once the person has recovered. We simply do not have enough information to tell whether that is the case for Covid-19.

"What Immunity to COVID-19 Really Means -- The presence of antibodies to the SARS-CoV-2 virus could provide some protection, but scientists need more data"


Epidemiol Infect. 1990 Oct; 105(2): 435–446.

doi: 10.1017/s0950268800048019

"The time course of the immune response to experimental coronavirus infection of man."


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