Stock market news live updates: Wall Street rocked by new COVID variant fears, Dow plunges over 900 points

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U.S. stocks plunged on Friday, with global markets rattled by a new coronavirus variant discovered in South Africa, which fanned concerns that new growth-crushing lockdowns could be imposed if the variant spreads widely.

Trading volumes were low due to the Thanksgiving holiday in the U.S., which may have exacerbated the volatility.

However, major benchmarks fell sharply during the holiday-shortened session, with the Dow (^DJI) diving by more than 900 points — logging its worst day of the year and its third worst Thanksgiving selloff ever. Meanwhile, S&P 500 (^GSPC) sank by over 2%, its biggest drop since February, and the Nasdaq (^IXIC) also fell sharply, but its losses were partly contained by a rally in stay-at-home stocks.

A new coronavirus variant has been discovered in South Africa, leading to an emergency session of the World Health Organization. Dubbed "Omicron," scientists say the new B.1.1.529 strain is a concern, because it harbors a large number of mutations found in other variants — including the fast-spreading Delta variant that exploded over much of the summer — and it seems to be rapidly spreading.

While there's no evidence yet, health officials are worried that the mutating variant could dilute or resist the efficacy of vaccines.

"It goes without saying that it’s still too early to say exactly how big a threat the new B.1.1.529 strain poses to the global economy," Neil Shearing, Group Chief Economist at Capital Economics, said in a note.

Still, "the lesson from the past couple of years is that it’s the restrictions that are imposed in response to the virus – rather than the virus itself – that causes the bulk of the economic damage. So, the key question is how governments will respond in the event that the B.1.1.529 strain spreads," Shearling wrote.

"That in turn will hinge on the extent to which it escapes the vaccines and, importantly, causes strains in national healthcare systems," he added — underscoring that governments in the U.S. and U.K. had taken a "learn to live with the virus" approach, and thus are far less likely than other regions to impose new restrictions.

BioNTech (BNTX) said on Friday it expects more data on the new coronavirus variant in South Africa within two weeks to help its shots should be reworked, and that the company and Pfizer (PFE) — its vaccine partner — could redesign its vaccine within 6 weeks, with an aim to distribute it within 100 days.

Pfizer surged as much as 8% to record, signaling that the new variant could create demand for the vaccine.