Fauci: Amount of virus in breakthrough delta cases 'almost identical' to unvaccinated | TheHill - The Hill

"What we learned that's new, John, in answer to your question, is that when you look at the level of virus in the nasopharynx of people who are vaccinated who get breakthrough infections, it's really quite high and equivalent to the level of virus in the nasopharynx of unvaccinated people who get infected," Fauci said.

The nasopharynx is part of the nasal cavity located above the back of the throat.

Fauci stated that it was "troubling" to find that the level of virus from the delta variant in both vaccinated and unvaccinated people is "really quite similar, almost identical.".