waning of that protection. we are seeing now more indications of breakthroughs, people who do get infected even though they're vaccinated. the vast, vast majority of them do not get very sick, they have some symptoms perhaps but don't ending up in the hospital. when you look at the data over the last three or four weeks and delta has really taken hold and look at other places like israel, you can begin to see that we are on a path where maybe in another month or two we'll see the potential of people getting more sick than they have been so far. so maybe you can say we're a little ahead of the cousin, but maybe if we waited we'd be behind the curve. it's a little bit of a goldilocks moment. where do you want to put down your bets? we think since lives of at stake, i'd rather be in that space than a little late. by september 20th if fda and cdc look at all the data and agree,