respect dr. collins, that's confusing messaging. that doesn't make sense. we should be mandating proof of vaccination before you board a flight in the united states or a test before youn board that flight. the same policy should apply. can i just say more broadly for all viewers out there -- >> absolutely. >> it's important to get this out rtthere. and i say that as a pulmonologist. in two weeks' time, three weeks' time, pfizer, moderna, other companies i'm sure are going to come out withi' headlines to sa vaccine effectiveness has declined to x percentage at preventing a positive test. and that's going to cause fear and g alarm. it is contingent upon everybody to know that there is no vaccine thatno exists in this world pri to covid, throughout this pandemic, that will prevent a positive test or mild symptoms. that just doesn't exist.es for flu. now for covid-19. again, i say this as a lung doc. that these vaccines now in moving forward the success by which they should be measured against, their definition of success is to keep you away from the hospital without severe