physician. it's good to see you again. there are more people as you know getting their booster shots. but it's more than the people who have gotten their first shot. there are still tens of millions who have yet to be vaccinated at all. should there be more focus on getting everyone their first shot? do you think booster shots are helping reduce the spread of covid the way initial vaccinations can? >> good afternoon, glad to be with you again, alex. the first and foremost priority still is getting the americans who are unvaccinated vaccinated. we have to continue to stress the importance of that. that is what's going to help us to turn the corner in this pandemic and not allow surges or to see hot spots continue to pop up. boosters are good for those who have individual risk factors, whether those risk factors are underlying disease, age, or occupational setting to ensure that they have adequate protection in the most durable fashion. that doesn't stop the pandemic from surging and that doesn't beat back the pandemic as a whole. >> okay, duly noted there.