Could nearly half of those with Covid-19 have no idea they are infected?
by David Cox from Science | The Guardian on (#543ZF)
As studies confirm many infected people show no symptoms, contact tracing and face masks assume even greater importance
When Noopur Raje's husband fell critically ill with Covid-19 in mid-March, she did not suspect that she too was infected with the virus.
Raje, an oncologist at Massachusetts General Hospital in Boston, had been caring for her sick husband for a week before driving him to an emergency centre with a persistently high fever. But after she herself had a diagnostic PCR test - which looks for traces of the Sars-CoV-2 virus DNA in saliva - she was astounded to find that the result was positive.
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