A brand new mannequin from the Centers for Disease Control and Prevention reveals that those that are contaminated with however present no indicators of COVID-19 account for greater than half of all coronavirus circumstances.
The mannequin, printed in JAMA Network Open on Thursday, reveals that an estimated 59% of all coronavirus circumstances come from those that are asymptomatic, together with 35% who’re presymptomatic — that means they initially don’t present signs however finally develop them — and 24% who by no means develop any indicators of signs of COVID-19.
“The findings of this examine counsel that the identification and isolation of individuals with symptomatic COVID-19 alone is not going to management the continued unfold of SARS-CoV-2,” the researchers wrote when describing their findings.
The mannequin helps the preventative measures specialists have beneficial for months, comparable to sporting a face protecting and training social distancing.
“The backside line is controlling the COVID-19 pandemic actually goes to require controlling the silent pandemic of transmission from individuals with out signs,” Jay C. Butler, the CDC deputy director for infectious illnesses and a examine co-author, informed the Washington Post. “The group mitigation instruments that we’ve must be utilized broadly to have the ability to sluggish the unfold of SARS-CoV-2 from all contaminated individuals, not less than till we’ve these vaccines broadly accessible.”
Effectively controlling the unfold of the virus will requires decreasing the chance of transmission from folks with out signs, and figuring out and isolating folks with COVID-19 signs, the examine authors wrote.
The findings “counsel that measures comparable to sporting masks, hand hygiene, social distancing, and strategic testing of people who find themselves not sick might be foundational to slowing the unfold of COVID-19 till protected and efficient vaccines can be found and broadly used,” the authors wrote.