in a month or two. it's going to take years to develop in an incremental fashion. >> reporter: despite mounting evidence omicron is less severe, the unprecedented surge in infections pushing the daily death toll to its highest point in nearly a year. >> milder does not mean mild, and we cannot look past the strain on our health systems and substantial number of deaths. >> reporter: and so many hospitals are running out of room. >> this empty bed is now the only empty bed in the hospital and it's already spoken for. >> reporter: 22 more patients at this oklahoma city hospital are just waiting for a bed. the sickest covid patients are unvaccinated. >> they don't go home. we have about a 50% mortality rate in our icus if you are unvaccinated. these are young patients. >> reporter: and tonight, scientists are tracking that subvariant of omicron called b.a.-2, now in the u.s. and at least 55 countres.

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