More than half of coronavirus cases are transmitted from people without symptoms of the virus, according to a new model from the Centers for Disease Control and Prevention.
“In this baseline case, 59% of all transmissions came from asymptomatic transmission, comprising 35% of presymptomatic individuals and 24% of individuals who never develop symptoms.” the model says.
Presymptomatic people are those who showed symptoms of the virus, but were asymptomatic and infectious before developing their symptoms.
The authors concluded:that the identification and isolation of individuals with symptomatic COVID-19 alone will not control the ongoing spread of SARS-CoV-2. “
According to the model, which was posted on the JAMA Network on Thursday, to slow the spread of the virus, it needs to focus more on asymptomatic people.
“These findings suggest that measures such as wearing masks, hand hygiene, social distancing and strategic testing of non-sick people will be key to slowing the spread of COVID-19 until safe and effective vaccines are available and widely used,” they said. authors.
Vaccines are spreading in the United States at a slower pace than anticipated. President-elect Joe Biden
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“The bottom line is the control of the COVID-19 pandemic will really require control of the silent pandemic of transmission from asymptomatic people,” said Jay Butler, CDC’s deputy director of infectious diseases and co-author of the study. he told The Washington Post. “The Community mitigation tools we have need to be widely used to be able to slow the spread of SARS-CoV-2 in all infected people, at least until we have these vaccines widely available.”