The World Health Organization warned against 'immunity passports,' which allow travel only to recovered patients, saying studies must first confirm whether people are indeed safe from reinfection.
The concept for such a card is largely based on the premise that an individual can only contract the coronavirus once before developing the necessary antibodies to fight it off. That premise undergirds another common theory: the concept,, that if enough of the population has been infected with the coronavirus — and is therefore immune — its transmission will slow and the risks of infection will diminish even for those who haven't caught it yet.
But these ideas depend to a large degree on the supposition that one cannot catch the coronavirus a second time — an idea that world health authorities said leaders should not count on right now. As of Friday, the WHO said,"No study has evaluated whether the presence of antibodies to SARS-CoV-2 confers immunity to subsequent infection by this virus in humans."
What's more, data reported from the world's early COVID-19 hotspots, such as South Korea and China, have shown that a growing number of recovered patients appear to have suffered a relapse of the disease.scores of people — or just over 2% of the country's recovered patients — were in isolation again after testing positive a second time.
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