delta variant, which is still highly transmissible, and probably this omicron variant as well as the cases pick up. one of the big questions is will omicron overtake delta so that this becomes the dominant one just like delta overtook the alpha variant this year. i don't think so. i think we'll wind up having both variants potentially affecting different populations. i still think we'll see a lot of delta cases, especially among the unvaccinated. the advantage of the omicron variant is that it has, because of its immune escape properties, i think particularly those who are partially immune, either because they've been infected and recovered and chosen not to get vaccinated after that, or because individuals have gotten two doses of the vaccines and have had waning immunity. what that means also is i think we'll have to change the definition of what full immunization means to three doses, because that's what's