community, if you give a virus enough opportunity to replicate, you know it's going to ultimately mutate and sometimes those mutations wind up being a new variant. that's exactly what happened with delta and certainly that's what happened with omicron. >> the biden administration does seem to be falling short when it comes to testing. as these cases are spiking, many americans are stuck in long lines, many pharmacies are sold out of the rapid at-home tests, not to mention they're expensive. the white house has even mocked the idea of sending tests to every american. is the state of testing in the united states acceptable to you? >> well, we've got to do better. we are doing better, if you look now compared to where we were a year ago, it's extraordinarily much different in the positive sense. we now have multiple, multiple at-home tests available when we virtually had none a year ago but we do need to do better.