the cdc director intervened to really break what was largely a tie. >> let's bring in our guest, founding director of the national center for disaster preparedness. let's talk about the confusion surrounding booster shots. why is it important for those who are eligible to get their third shot? >> yeah. hi, alex. if you are confused about this i don't blame you and join the crowd. here is what happened. i think all of us were led to expect that if you got the first two doses of the vaccine made by moderna or pfizer or the one dose of the j&j vaccine, that you're going to be okay for some indeterminate period of time. then what happened is we started getting research information and data from israel and the vaccine manufacturers saying it looks like there might be a diminishing of your immune response after six, seven, eight months after the last booster