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Huge number of COVID infections are from people with no symptoms

During the initial wave of the COVID-19 outbreak in New York City, only between one in five and one in seven cases of the virus was symptomatic, according to new research. Researchers also found that non-symptomatic cases substantially contribute to community transmission, making up at least 50% of the driving force of SARS-CoV-2 infection. When the COVID-19 epidemic arrived in the US, the investigators noticed that it was very difficult to estimate what proportion of people infected with SARS-CoV-2 would go on to develop symptoms, partially due to the initial challenges with testing capacity. “Without testing capacity data, it’s very difficult to estimate the difference between cases that were unreported due to a lack of testing and cases that were actually asymptomatic,” says first author Rahul Subramanian, a PhD student of epidemiology at the University of Chicago.

At least 50% of Covid-19 cases are asymptomatic, study suggests

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