World Health Organization executives announced that not all individuals who heal from the coronavirus have the needed antibodies to resist a second infection, increasing concern that patients may not develop immunity after surviving COVID-19.
“With regards to recovery and then reinfection, I believe we do not have the answers to that. That is an unknown,” Dr. Mike Ryan, executive director of WHO’s emergencies program, said at a press conference at the organization’s Geneva headquarters on Monday.
A preliminary study of patients in Shanghai found that some patients had “no detectable antibody response” while others had a very high response, said Dr. Maria Van Kerkhove, WHO’s the lead scientist on COVID-19. Whether the patients who had a strong antibody response were immune to a second infection is “a separate question,” she added.
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