Pelosi and an aid just tested positive. They are both vaccinated and have mild symptoms so far, so they should hopefully be safe.
Also, Jen Psaki recently confirmed a breakthrough infection in the White House:
"Press secretary Jen Psaki confirmed that there have been multiple breakthrough coronavirus cases among White House staffers. Psaki did not say how many breakthrough cases there have been in the White House, but added that she would check."
She says the administration's commitment to "release information provocatively" only applies to "commissioned officers."
“We know that there will be breakthrough cases, but as this instance shows, cases in vaccinated individuals are typically mild,” a WH official says. “The White House is prepared for breakthrough cases with regular testing.”