Health

How many people have had Covid?  The actual number of infections could be 60 percent higher than the official figures show, suggesting there have been around 122 million cases around the world that have never been recorded.

The high rate of unrecorded cases also suggests that Covid is far less lethal than estimates suggest, nearly halving the fatality rate.

Although we know how many people have died with Covid or needed hospital treatment, there’s been no way to track the true infection rate among those who had mild symptoms or asymptomatic or were never diagnosed.

Researchers from the University of Washington created a computer model to discover the true extent of Covid infections, and they estimate that up to 60 percent of Covid cases were undetected up to last March. 

With more accurate data, healthcare managers can better handle the virus’s prevalence and spread, says lead researcher Adrian Rafferty.

(Source: Proceedings of the National Academy of Sciences, 2021; 118: e2103272118)

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