New research suggests that far more people have had the coronavirus without any symptoms, fueling hope that the death rate may be lower than feared. But it also means it’s impossible to know who around you may be contagious.
These studies used tests that look for bits of the virus from throat and nose swabs, which can miss cases. Someone can test negative one day if there’s not much virus to detect and then positive the next.found more than half of those who had no symptoms when they tested positive later felt sick.
On Friday, researchers reported results from antibody tests on 3,300 people in California’s Santa Clara county: Between 1.5 percent and 2.8 percent have been infected, they claimed. That would mean 48,000 to 81,000 cases in the county — more than 50 times the number that have been confirmed.has not been formally published or reviewed, but some scientists were quick to question it.
Antibody testing in particular needs to be done “in an unbiased approach” on groups of people that are representative of the geographic, social, racial and other conditions, Mina said.such studies, and they could guide public health advice on returning to normal life for people in certain areas.
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