logically about it. >> do you think eight months should be a hard and fast marker? what about people planning to travel six months after their second shot? is that not a good enough reason to get a booster, that third shot? >> well, i think we have to look at the data showing when immunity actually wanes. and we actually haven't seen certainly very little published data. it's mostly information on the israel ministry of health website, a little bit of data coming from the mayo clinic and other sources. so we haven't really had the chance to review the full data to say when that set point is to give the third immunization. i think the other thing that we need to do is reframe this a little bit. we keep on talking about it as a booster. whereas i have thought all along this is a three-dose vaccine. and it was a three-dose vaccine because the way we had to give those first two immunizations right in a row just three to