New research suggests that far more people have had Covid-19 without any symptoms, fuelling hope that it will turn out to be much less lethal than originally feared
A station passageway is crowded with face mask wearing commuters during a rush hour Monday, April 20, 2020, in Tokyo.
The head of the US Centers for Disease Control and Prevention says 25% of infected people might not have symptoms. Collectively, though, they suggest “we have just been off the mark by huge, huge numbers” for estimating total infections, he said.The virus has caused nearly unprecedented economic and social harm since its existence was reported in early January.Based on known cases, health officials have said the virus usually causes mild or moderate flu-like illness. Now evidence is growing that a substantial number of people may have no symptoms at all.
Better answers may come from newer tests that check blood for antibodies, substances the immune system makes to fight the virus. But the accuracy of these, too, is still to be determined. Ships, maternity wards and single counties also don’t provide data that can be used to generalise about what’s happening elsewhere. And many of the figures have come from snapshots, not research on wide populations over time.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.
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