WHO says no evidence antibody tests can determine immunity

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The World Health Organization has warned there is no evidence to suggest the presence of antibodies in blood can determine whether someone has immunity to the coronavirus.
Dr. Mike Ryan, the WHO’s executive director for health emergencies, said Friday there was no indication so far that a large proportion of the population had developed immunity.
The number of recovered coronavirus patients who have retested positive for the virus has raised concerns about how antibodies work in response to Covid-19.
While scientists say there is no evidence yet that a person who has retested positive can spread the virus further, there haven’t been any conclusive studies to rule that out.

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