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A new model from the Centers for Disease Control and Prevention shows that those who are infected but show no signs of COVID-19 account for more than half of all coronavirus cases.
The model, published Thursday in the JAMA Network Open, shows that about 59% of all coronavirus cases come from those who are asymptomatic, including 35% who are presymptomatic – meaning they initially do not have symptoms but do not show symptoms. eventually develop – and 24% who do not develop any signs of symptoms of COVID-19.
“The results of this study suggest that identifying and isolating people with symptomatic COVID-19 alone will not control the continued spread of SARS-CoV-2,” the researchers wrote in describing their findings.
The model has supported preventative measures recommended by experts for months, like wearing a face mask and practicing social distancing.
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“The bottom line is that controlling the COVID-19 pandemic is really going to require controlling the silent pandemic of transmission from people without symptoms,” said Jay C. Butler, CDC deputy director for infectious diseases and co-author of the study, in Washington. Publish. “The community-based mitigation tools we have at our disposal must be used extensively so that we can slow the spread of SARS-CoV-2 from all those infected, at least until these vaccines are widely available.”
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Effectively controlling the spread of the virus will require reducing the risk of transmission from people without symptoms and identifying and isolating people with symptoms of COVID-19, the study authors wrote.
The results “suggest that measures such as wearing masks, hand hygiene, social distancing and strategic testing of people who are not sick will be essential to slow the spread of COVID-19 until safe and effective vaccines are available and widely used “. wrote the authors.
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