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RIO DE JANEIRO, BRAZIL - To determine if someone is no longer contagious because he or she has already had the Covid-19 disease, should be possible in some countries in the near future.

Becoming immune against the novel coronavirus without even knowing it - a dream! However, this is not unrealistic, says Swiss infectologist Pietro Vernazza: "Many people contract the disease with very mild or even no symptoms, and build up an immune response".

How often this happens is unclear. But in Iceland, for example, where a large number of people have been tested, half of those infected had no symptoms . . .

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