CNBC's "Power Lunch" team discusses the market sell-off with CNBC contributor Ron Insana, and Michael Farr, president and CEO of Farr, Miller and Washington.

Stocks fell sharply on Friday, wiping out the Dow Jones Industrial Average’s gain for January, as investors grew increasingly worried about the potential economic impact of China’s fast-spreading coronavirus.

The Dow dropped 603.41 points, or 2.1%, to 28,256.03 in the 30-stock average’s worst day since August. The S&P 500 had its worst day since October, falling 1.8% to 3,225.52. The Nasdaq Composite dropped 1.6% to 9,150.94.

On Friday, the U.S. declared the coronavirus a public health emergency within the country. Delta, American and United suspended all flights between China and the U.S.

The virus, which was first discovered in the Chinese city of Wuhan, has now spread to at least 18 other countries and has dampened sentiment over global economic growth. China’s National Health Commission confirmed on Friday that there have been 9,692 confirmed cases of the coronavirus, with 213 deaths.

“There’s fear going into the weekend,” said Ilya Feygin, senior strategist at WallachBeth Capital. “The theme coming into this year was the Fed and Trump are going to bail us out of any problems, but the virus is something neither one can do anything about. That’s a reason to become more fearful.”

Las Vegas Sands, a proxy stock for the coronavirus given the company’s exposure to the Chinese market, fell more than 1%. Airline stocks such as American and United dropped more than 3% each while Delta slid 2.4%. Travel stocks also got hit as the Trump administration imposed tighter travel restrictions to China.

The WHO recognized the deadly pneumonia-like virus as a global health emergency on Thursday, citing concern that the outbreak continues to spread to other countries with weaker health systems. WHO’s designation was made to help the United Nations health agency mobilize financial and political support to contain the outbreak.

“The outbreak of the coronavirus has added another headwind to the near-term outlook for stocks,” said Peter Berezin, chief global strategist at BCA Research, said in a note. “Viruses often become less lethal as they mutate because a virus that kills its host is also a virus that kills itself. Unfortunately, in a world of mass travel, a virus can spread across the globe before it has time to lose potency.”

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