I think we should not underestimate this part: > When a vaccinated person gets infected with delta -- called a "breakthrough infection" -- "the level of virus

I think we should not underestimate this part: > When a vaccinated person gets infected with delta -- called a "breakthrough infection" -- "the level of virus in their nasopharynx is about 1,000 times higher than with the alpha variant," Fauci said in an interview Wednesday with MSNBC.