More than half of coronavirus cases are transmitted by people without symptoms of the virus, according to a new model from the Centers for Disease Control and Prevention.
“In this baseline scenario, 59% of all transmission was from asymptomatic transmission, with 35% from pre-symptomatic subjects and 24% from subjects who never develop symptoms,” the model says.
Presymptomatic individuals are those who did develop symptoms of the virus, but were asymptomatic and contagious before developing their symptoms.
The authors concluded “that the identification and isolation of individuals with symptomatic COVID-19 alone will not control the continued spread of SARS-CoV-2. “
According to the model, posted on JAMA Network on Thursday, to slow the spread of the virus, more attention needs to be paid to people who are not showing symptoms.
“These findings suggest that measures such as mask wearing, hand hygiene, social distancing and strategic testing of people who are not sick will be fundamental in slowing the spread of COVID-19 until safe and effective vaccines are available and large. are widely used, ”authors said.
Vaccines are being rolled out in the United States at a slower pace than expected. Elected president Joe Biden
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“The bottom line is that controlling the COVID-19 pandemic really does require controlling the silent pandemic of transmission by individuals without symptoms,” Jay Butler, the CDC’s deputy director for infectious diseases and a co-author of the research, told The Washington Post. “The community reduction tools we have should be widely used to slow the spread of SARS-CoV-2 through all infected individuals, at least until we have those vaccines widely available.”