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The prospect of a new year, sobering warning tonight in the fight against the coronavirus, new surge of cases and hospitalizations in the u.s. driven by the delta variant. for now, at least. the nation's top expert on nation's diseases dr. anthony fauci says the effort over omicron will stress test a healthcare system already on the brinks. brace for a few tough weeks and months ahead, dr. fauci's boss agrees. >> other variants pale by comparison in terms of the rate this one is spreading, doubling every two to three days, first in south africa and now parts of europe and the u.s. is on that e...

Providing a very serious challenge. this variant of virus, with its 57 mutations certainly a difficult one for us to cope with because it is so contagious, more than delta, more than alpha-beta. all the other previous variants of pale by comparison in terms of the rate this one is spreading. doubling every two -- three days first in south africa at now parts of europe and the u.s. is on that exponential curve right now. so we are in for a world of trouble i am in a freight in the next month or two pair there are things people can do i hope we can talk about that. this is not one of these situa...

>> all of the other previous variants pail by comparison in terms of the rate at which this one is spreading, doubling every two to three days, first in south africa, now in parts of europe. and the u.s. is on that exponential curve right now. so, we are in for a world of trouble, i'm afraid, in the next month or two. >> covid is also putting sports leagues across the u.s. in a bind, with professional and college teams being forced to postpone or cancel games. cnn's nadia romero has more. >> reporter: well, normally this time of year would be a great time for sports fans. you've got college ho...

Hospitalizations in the u.s. for now, at least. the nation's top expert on infectious diseases, dr. anthony fauci, says the inevitable takeover by the omicron variant will stress test a health care system already on the brink. he says americans need to brace for a tough few weeks to months ahead. his boss shares the bleak assessment. >> all of the other previous variants pale by kcomparison in terms of the rate by which this is spreading, doubling every two three days, first in south africa, now in parts of europe, and the u.s. is on that exponential curve right now. we're in for a world of tr...

Providing a very serious challenge. this variant of virus, with its 57 mutations certainly a difficult one for us to cope with because it is so contagious, more than delta, more than alpha-beta. all the other previous variants of pale by comparison in terms of the rate this one is spreading. doubling every two -- three days first in south africa at now parts of europe and the u.s. is on that exponential curve right now. so we are in for a world of trouble i am in a freight in the next month or two pair there are things people can do i hope we can talk about that. this is not one of these situa...