By Kelsey Gee 

CHICAGO--Hog prices surged 2.8% to an all-time high, fueled by concerns that a deadly swine virus is cutting deeper into U.S. supplies.

Lean-hog futures jumped three cents a pound--the exchange-imposed daily limit--as traders worry the virus is spreading and will take a heavier toll on U.S. production than previously thought.

April hog futures at the Chicago Mercantile Exchange on Tuesday reached $1.1167 a pound, setting a record for the second straight day. Prices have soared 31% so far this year.

Porcine epidemic diarrhea virus has spread to farms in 25 states and killed millions of young pigs since it was identified in the U.S. for the first time last April, and the number of confirmed cases has accelerated in recent months. The virus, which causes severe diarrhea and vomiting, is fatal only to young pigs and poses no threat to human health or food safety, according to veterinarians.

The virus has contributed to higher U.S. pork prices for consumers. Federal forecasters project retail prices to rise as much as 3% this year.

Futures traders have taken cues lately from the cash markets for hogs, where meatpackers have been paying more for slaughter-ready animals. The average cash price jumped to 97.28 cents a pound this week, about 18% higher than a month earlier, according to CME data.

Before this week, the record high for a front-month hog futures contract at the CME was $1.0745 a pound in August 2011.

"This market has been explosive," said Don Roose, president of risk-management firm U.S. Commodities Inc. in West Des Moines, Iowa.

Many traders now believe the virus will cause U.S. pork production to decline in the second and third quarters, Mr. Roose said. In its most recent estimate, the U.S. Department of Agriculture forecast a 1% increase from a year earlier in both periods.

Last month, the USDA cut its forecast for total U.S. pork production this year by 160 million pounds to 23.4 billion, citing the continued spread of the virus. Its forecast marked a 1% increase over 2013 output, down from a nearly 2% increase projected in January.

The soaring futures prices represent "fearful buying," said Ron Plain, an agricultural economist at the University of Missouri who has followed the livestock markets for 33 years. "I've never seen anything quite like this."

As of Feb. 16, 3,856 separate positive cases of the virus have been reported to the National Animal Health Laboratory Network, which tracks the disease. That is nearly double the figure of 1,998 at the end of 2013. Each case may represent anywhere from one infected animal on a farm to thousands across a producer's operations.

The USDA estimates U.S. retail pork prices will rise 2% to 3% this year, up from 0.9% last year. Average retail prices have been edging lower in recent months, after hitting a record $3.81 a pound in October, according to USDA data.

Write to Kelsey Gee at kelsey.gee@wsj.com

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