“If you look at the acceleration of the number of cases, the seven-day average has gone up substantially. You know what we really need to do, Jon, we say it over and over again and it’s the truth — we have 100 million people in this country who are eligible to be vaccinated who are not getting vaccinated. We are seeing an outbreak of the unvaccinated,” he added.

“From the standpoint of illness, hospitalization, suffering and death, the unvaccinated are much more vulnerable because the vaccinated are protected from severe illness, for the most part, but when you look at the country as a whole. And getting us back to normal, the unvaccinated, by not being vaccinated, are allowing the propagation and the spread of the outbreak which ultimately impacts everybody,” Fauci said.

Concerns over the coronavirus resurged this week, as research about the outbreak of the virus in Provincetown, Massachusetts, indicated that the now-dominant delta variant may be able to spread among fully vaccinated people.

During an investigation of the outbreak, researchers learned that the amount of virus in the noses of vaccinated people experiencing a breakthrough infection was the same as in an unvaccinated person — a concerning sign that vaccinated people can also spread the virus.

The data helped the CDC make its decision to bring mask guidelines back for vaccinated individuals in areas of high or substantial spread of the virus — despite the fact that breakthrough cases in vaccinated individuals are overwhelmingly mild and do not result in hospitalization or death.

“That has much more to do with transmission,” Fauci said of the new guidelines.

“If you look at the acceleration of the number of cases, the seven-day average has gone up substantially. You know what we really need to do, Jon, we say it over and over again and it’s the truth — we have 100 million people in this country who are eligible to be vaccinated who are not getting vaccinated. We are seeing an outbreak of the unvaccinated,” he added.