good morning to our viewers here in the united states and all around the world. it is monday, december 6th. i'm john berman with brianna keilar. we do have breaking news this morning. restrictions on international trampers coming to the united states take effect this morning. everyone has to show proof of a negative covid test taken within one day of departure. foreign nationals will have to show proof they are fully vaccinated. the average number of daily cases of covid is 20,000. that's the highest in two months. omicron variant has been detected in at least 17 states. that has the demand for vaccines spiking. scientists are still waiting for conclusive information about the severity of the omicron variant. in other words, does it make you more sick? dr. anthony fauci said while it's early and things could change, there are some encouraging signs. >> thus far, it does not look