Early on, when he was still motivated more by science than politics, Dr. Fauci said emphatically, “Even if there is some asymptomatic transmission, in all the history of respiratory viruses of any type, asymptomatic transmission has never been the driver of outbreaks. He added that “the driver of outbreaks is always a symptomatic person.”
https://www.theblaze.com/op-ed/horowitz-deborah-birx-pushing-lockdown
