confirming they too now have cases of omicron. all those cases in travelers who recently returned from southern africa. they are part of that rapidly growing list of nations that have identified the variant within their borders. also on that list, the uk, which has two cases. prime minister boris johnson just wrapped up a press conference in london where he announced tighter border restrictions to try to slow what he called the seeding of the variant inside the uk. from now on, if you're landing in britain, you're going to have to go into self-isolation for two days until you can produce a negative pcr test. now, the prime minister admitted there is a lot we still don't know about this variant, but he would prefer to be aggressive now. i want you to take a listen to what he said earlier. >> this variant is spreading around the world with two cases so far identified here in the uk. as always, i must stress this,