more variants in the next six months? >> the virus is going to continue to mutate. and i think people have assumed that we were going to see a mutant that allowed it to get around immunity from prior infection and from vaccination. and omicron seems to be the first one to be able to do that efficiently. maybe now the other descendants will be from omicron. we know there are four other coronaviruses that cause 5% of our common colds and omicron is going to join the other four. and the fact is it is still able to kill at a rate much higher than other coronaviruses because so many people not vaccinated. the best thing is so get more people vaccinated. >> what's your advice to people traveling this year. >> it is not the actual travel, sitting on an airplane that gets you infected. it is what you do afterwards. if you are fully vaccinated i think you can be assured you are not going to get severe disease. if you are unvaccinated you are