Detailed text transcripts for TV channel - MSNBC - 20210521:15:23:00
They are still being observed. we need to see if there are signs of reinfection in those clinical trial participants. also, a lot of the studies looking at needs for booster are done in the laboratory, looking at antibodies. they are one part of our very complex immune system. there are memory cells. it's really difficult to determine exactly when and if boosters will be needed. it's about observing for reinfections as well as doing more lab studies. it's important that we are prepared if they are needed. >> let's talk about the variants when it comes to the boosters. the cdc saying there are ...