How much is asymptomatic spread driving Covid-19? Here's what the evidence says.
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Nearly 60% of all new coronavirus cases may come from people who carry the virus but who exhibit no symptoms of Covid-19, according to a new
CDC model—findings experts say are even more concerning in light of a new, more contagious variant of the virus that's emerged.
For the model, published in
JAMA Network Open, researchers at CDC looked at data from a number of Covid-19 studies from last year, which they used to establish several baseline assumptions. For example, the researchers presumed that 30% of individuals who contract the new coronavirus never develop symptoms but remain 75% as infectious as those who do develop symptoms.