Just sayin, media needs an excuse, and it matters mostly short-term and at the margins.
"The Dow Gives Up 500-Point Rally On News Omicron Hits US"
Well, the shaded circle captures roughly when that headline hit (today's Dow chart):
So, nope... As we've pointed out, the technical setup right here is somewhat suspect, and, as I mentioned this morning, there's the interest rate sensitivity of the sector that pretty much dominates the major averages (tech) -- although yields have rolled back over, for the moment...
Here's today's chart of the Nasdaq 100 Index: