Are you referring to the testimony here: https://thehill.com/video/senate/580032-watch-live-fauci-walensky-testify-before-senate-on-covid-19 https://thehill.co

Are you referring to the testimony here: https://thehill.com/video/senate/580032-watch-live-fauci-walensky-testify-before-senate-on-covid-19 https://thehill.com/video/senate/580032-watch-live-fauci-wal... More specifically, the exchange ~46 minutes with Burr where she discusses how the CDC is studying infection derived immunity? (I'm not gonna watch the 3 hours to figure out what timestamp you are referring to with the vaccination rate)