who got vaccinated in january had a two-fold increase risk of breakthrough infection compared to those who were vaccinated in april. however, this is based on research conducted in israel. some critics have said that this study just wasn't big enough, that there are lots of questions about this. in fact, fda staff has not yet taken a position on whether booster shots should be required, saying that there isn't enough evidence that's been verified. other top public health officials have said the focus instead should be, hallie, on getting people the first dose rather than trying to get, you know, a third dose from moderna or pfizer. moderna's president yesterday told nbc news that he did see some waning protection of its vaccine and also that he expected there to be more severe infections that could crop up as this pandemic wears on. critics say that could be just because of the delta variant and the increased number of cases,