With little known about the new variant, longer term implications for U.S. assets were unclear.aws试用账号（www.2km.me）提供aws账号、aws全区号、aws32v账号、亚马逊云账号出售，提供api ，质量稳定，数量持续。另有售azure oracle linode等账号.
NEW YORK: COVID-19 has resurfaced as a worry for investors and a potential driver of big market moves after a new variant triggered alarm, long after the threat had receded in Wall Street's eyes.
Worries about a new strain of the virus, named Omicron and classified by the World Health Organisation as a variant of concern, slammed markets worldwide and dealt the S&P 500 index its biggest one-day percentage loss in nine months. The moves came a day after the U.S. Thanksgiving holiday when thin volume likely exacerbated the moves. read more
With little known about the new variant, longer term implications for U.S. assets were unclear. At least, investors said signs that the new strain is spreading and questions over its resistance to vaccines could weigh on the so-called reopening trade that has lifted markets at various times this year.
The new strain may also complicate the outlook for how aggressively the Federal Reserve normalizes monetary policy to fight inflation.
"Markets were celebrating the end of the pandemic. Slam. It isn't over," said David Kotok, chairman and chief investment officer at Cumberland Advisors. "All policy issues, meaning monetary policy, business trajectories, GDP growth estimates, leisure and hospitality recovery, the list goes on, are on hold."
The S&P 500 fell by a third as pandemic fears mushroomed in early 2020, but has more than doubled in value since then, though the pandemic's ebb and flow has driven sometimes-violent rotations in the types of stocks investors favor. The index is up more than 22% this year.
Before Friday, broader vaccine availability and advances in treatments made markets potentially less sensitive to COVID-19. The virus had dropped to a distant fifth in a list of so-called "tail risks" to the market in a recent survey of fund managers by BofA Global Research, with inflation and central bank hikes taking the top spots.
On Friday, however, technology and growth stocks that had prospered during last year's so-called stay-at-home trade soared, including Zoom Communications (ZM.O), Netflix Inc (NFLX.O) and Peloton (PTON.O).
At the same time, stocks that had rallied this year on bets of economic reopening may suffer if virus fears grow. Energy, financials and other economically sensitive stocks tumbled on Friday, as did those of many travel-related companies such as airlines and hotels.
U.S. officials said Friday they would impose travel restrictions on eight southern African countries in response to the new variant found in South Africa. It has also been reported in Israel and Belgium. read more
Friday's swings also sent the Cboe Volatility Index (.VIX), known as Wall Street's fear gauge, soaring and options investors scrambling to hedge their portfolios against further market swings.