The Omicron variant has a 'record' number of mutations that may hinder vaccine effectiveness, NIH director says

NIH Director Francis Collins during a November 28, 2021, appearance on "Fox News Sunday."Fox News/Fox News Sunday
NIH Director Francis Collins said Sunday that the Omicron variant could present challenges to existing vaccines.
The new variant has a "record" number of mutations to the spike protein, the part of the virus that attaches to human cells, he said.
He added that people should still get the current vaccines and boosters.
The newly discovered Omicron variant of the coronavirus has a "rec