FWIW, US Rep. Stephen Lynch (D-MA) tested positive on Friday for COVID after being exposed to an infected staffer. He had received the 2nd vaccine shot prior to the inauguration:
https://www.cnn.com/2021/01/30/politics/stephen-lynch-tests-...
https://www.cnn.com/2021/01/30/politics/stephen-lynch-tests-...
It's worth basically nothing. We already know it's 95% effective; someone has to be the 5%, and there's a publication bias towards reporting on those.