U.S. equities tumbled alongside stocks in Europe and Asia as authorities struggled to keep the coronavirus from spreading more widely outside China. Havens including Treasuries and gold surged.

In a dramatic day across markets, these were some of the standout moves:

• All three main U.S. stock benchmarks slumped about 3 per cent, with the S&P 500 Index tumbling the most on an intraday basis since August. The Dow Jones Industrial Average erased all of its gains for the year.
• The FANG cohort of megacap tech shares that led the year’s rally plunged more than 4 per cent. AMD Corp. led losses in chipmakers exposed to China, at one point sinking more than 10 per cent. High-flyers Virgin Galactic and Tesla each fell about 7 per cent. Alpha Pro Tech, maker of protective clothing and masks, surged 15 per cent.
• The Stoxx Europe 600 Index slid 3.8 per cent on trading volumes well above average for the largest drop since 2016 as investors fled travel and luxury-goods shares. A gauge of credit risk on the region’s high-yield companies jumped.
• The yield on 10-year Treasuries approached the 2016 record low.
• South Korea’s benchmark dropped 3.9 per cent, leading declines across Asia, though Japan’s markets were shut for a holiday.
• Spot gold approached US$1,700, while Brent crude oil tumbled about 5 per cent.

The risk-off mood hardened as the epidemic spread to more than 30 countries, with South Korea reporting a jump in infections and Italy locking down an area of 50,000 people near Milan. Finance chiefs and central bankers from the largest economies warned this weekend that they saw the virus bringing downside risks to global growth.

“Stock markets around the world are beginning to price in what bond markets have been telling us for weeks -- that global growth is likely to be impacted in a meaningful way due to fears of the coronavirus,” said Chris Zaccarelli, chief investment officer for Independent Advisor Alliance.

Governments and companies are curbing travel and trade in an attempt to contain a novel pathogen that can be transmitted by people without symptoms. Today’s market moves follow on last week’s surge into havens after fresh warnings by companies over the potential impact of the virus on business and global supply chains. Adding to the anxiety Monday was China announcing an easing of the quarantine of Wuhan, only to retract the statement hours later.

“Markets hate uncertainty and the coronavirus represents the most uncertain macro risk markets have faced in years,” said Alec Young, managing director of global markets research at FEST Russell. “Investors are also acutely aware that many misjudged the economic severity of the virus early on, making them more open to entertaining worst-case scenarios now.”

Elsewhere, Italian bonds dropped on concern that the spread of the coronavirus may push the economy into a recession. The Australian dollar weakened to an 11-year low and the offshore yuan held most of last week’s decline.

These are some key events coming up:

Earnings keep rolling in from companies including: Home Depot Inc. on Tuesday; Peugeot SA on Wednesday; Baidu Inc., Best Buy Co. Inc., Occidental Petroleum Corp. and Dell Technologies Inc. on Thursday; and London Stock Exchange Group Plc on Friday.
The Democratic presidential debate in South Carolina is on Tuesday.
The Bank of Korea announces its policy decision on Thursday, with risks to the outlook growing amid a surge in coronavirus cases.
U.S. jobless claims, GDP and durable goods data are out Thursday.
Japan industrial production, jobs, and retail sales figures are due on Friday.

These are the main moves in markets:

Stocks

• The S&P 500 Index sank 2.8 per cent to 3,243.94 as of 3:16 p.m. New York time, the lowest in more than three weeks on the largest tumble in more than six months.
• The Dow Jones Industrial Average sank 2.9 per cent to 28,145.92, the lowest in more than 10 weeks on the biggest tumble in more than six months.
• The Nasdaq Composite Index decreased 3.2 per cent to 9,273.79, the lowest in three weeks on the largest tumble in almost seven months.
• The MSCI All-Country World Index sank 2.7 per cent to 557.28, the lowest in more than 10 weeks on the biggest tumble in about two years.
• The Stoxx Europe 600 Index sank 3.8 per cent to 411.86, the lowest in three weeks on the largest tumble in almost four years.

Currencies

• The Bloomberg Dollar Spot Index climbed 0.1 per cent to 1,215.80.
• The euro was little changed at US$1.085, the strongest in more than a week.
• The Japanese yen strengthened 0.8 per cent to 110.75 per dollar, the biggest increase in six months.
• The British pound dipped 0.3 per cent to US$1.2922.

Bonds

• The yield on 10-year Treasuries decreased nine basis points to 1.38 per cent, the lowest in more than three years on the biggest tumble in almost 12 weeks.
• The yield on 30-year Treasuries dipped eight basis points to 1.84 per cent, the lowest on record with the largest dip in more than seven weeks.
• Germany’s 10-year yield dipped five basis points to -0.48 per cent, the lowest in almost 20 weeks on the biggest dip in more than seven weeks.
• Britain’s 10-year yield declined three basis points to 0.54 per cent, hitting the lowest in three weeks with its fifth straight decline and the largest drop in more than two weeks.

Commodities

• Gold strengthened 0.9 per cent to US$1,658.25 an ounce, reaching the highest in about seven years on its fifth consecutive advance.
• Copper fell 1.3 per cent to US$2.58 a pound, the lowest in two weeks on the largest fall in more than two weeks.
• West Texas Intermediate crude dipped 3.6 per cent to US$51.45 a barrel, the lowest in more than a week on the biggest decrease in almost seven weeks.