variant, causing the spread. do you see any other possible or logical explanation? >> no. i think it likely is. we are seeing it particularly in the state of south africa where omicron is dominant. i am pretty worried this really does show omicron is widespread there and we are seeing hospitalizations rise as well. some concerning features out of south africa. >> thank you to all of you. up next omicron and the vaccine. so many unanswered questions. we'll talk to a top vaccine expert in the country. then, could your next flight run on scraps of food? cnn gets a ride into the future. stay with us.