A woman wearing a protective face mask walks past a closed restaurant in Paris as a lockdown is imposed to slow the rate of the coronavirus disease in France, April 16, 2020. — Reuters pic
“Our immune systems remember, which normally prevents you from being infected by the same virus later on.”But for RNA-based viruses such as Sars-Cov-2 — the scientific name for the bug that causes the Covid-19 disease — it takes about three weeks to build up a sufficient quantity of antibodies, and even then they may provide protection for only a few months, Vivier told AFP.
For SARS, which killed about 800 people across the world in 2002 and 2003, recovered patients remained protected “for about three years, on average,” Francois Balloux director of the Genetics Institute at University College London, told AFP.Policemen rides past the closed Louvre Pyramid designed by Chinese-born US architect Ieoh Ming Pei as a lockdown is imposed to slow the rate of the coronavirus disease in Paris, France, April 16, 2020.
As tests for live virus and antibodies have not yet been perfected, it is also possible that these patients at some point tested “false negative” when in fact they had not rid themselves of the pathogen. “That’s something we really need to better understand — what does that antibody response look like in terms of immunity.”“We are at the stage of asking whether someone who has overcome Covid-19 is really that protected,” said Jean-Francois Delfraissy, president of France’s official science advisory board.
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