More evidence that healthy people spread coronavirus, scientists say

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Scientists offered more evidence Wednesday that the coronavirus is spread by seemingly healthy people who show no clear symptoms, and the federal government issued new guidance warning that anyone exposed to the disease can be considered a carrier.

A study by researchers in Singapore became the latest to estimate that somewhere around 10 per cent of new infections may be sparked by people who carry the virus but have not yet suffered its flu-like symptoms.

In response to that study and others, the Centers for Disease Control and Prevention changed how it defined the risk of infection for Americans. The agency’s new guidance targeted people who have no symptoms but were exposed to others with known or suspected infections. It essentially says that anyone may be a carrier, whether that person has symptoms or not.

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The findings complicate efforts to gain control of the pandemic and reinforce the importance of social distancing and other measures designed to stop the spread, experts said.

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“You have to really be proactive about reducing contacts between people who seem perfectly healthy,” said Lauren Ancel Meyers, a University of Texas at Austin researcher who has studied coronavirus transmission in different countries.

The newest research was published online by the CDC. It focused on 243 cases of coronavirus reported in Singapore from mid-January through mid-March, including 157 infections among people who had not traveled recently. Scientists found that so-called pre-symptomatic people triggered infections in seven different clusters of disease,

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