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Healed but tested positive again for Covid-19. This mishap happened several weeks ago to dozens of cases of South Korean patients and raised questions. According to the World Health Organization, these cases of patients who tested positive again were linked to the presence of cells that persisted in the lungs after recovery. The reinfection hypothesis would be rejected.

Asked by AFP Wednesday about the consequences of this case, WHO, without referring specifically to the South Korean cases, said "to be aware of patients" of this type. "From what we know today, based on very recent data, it appears that these patients are expelling material that has persisted in the lungs as part of the recovery phase," the organization said.

"We must systematically collect samples to better understand how long they harbor live virus," she added, adding that just because the virus is alive does not mean that it can be transmitted to someone. one another.

No response on immunization after infection

In an interview with the BBC a few days ago, Maria Van Kerkhove, one of the managers of the management of the pandemic at the WHO, had assured that they were "dead cells" in the lungs which went up and led on the positive test. "It is not a contagious virus, it is not a reinfection, it is not a reactivation. It's part of the recovery process, ”she insisted.

But even if studies show that infected patients develop antibodies within three weeks of illness, that still does not completely answer crucial questions: are we immune after SARS-Cov-2 infection? And if so, to what degree and for how long? "We have no answer," insisted Maria Van Kerkhove.

Our file on the coronavirus

Experts can only extrapolate from other coronaviruses, which do not confer lifelong immunity, and in particular SARS, from which patients were protected for at least several months.

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