This 2002 electron microscope image made available by the Centers...

This 2002 electron microscope image made available by the Centers for Disease Control and Prevention shows a Listeria monocytogenes bacterium. Health officials have announced a recall of liverwurst and deli meat products, Friday, July 26, 2024, in connection with a national listeria outbreak that has sickened nearly three dozen people in 13 states. Credit: AP/Elizabeth White

U.S. health officials Friday announced a recall of some Boar's Head liverwurst and deli meats as they investigate a listeria outbreak that has sickened nearly three dozen people and caused two deaths.

Boar’s Head Provisions Co. recalled liverwurst because it may be tainted with the listeria bacteria, the U.S. Agriculture Department said. The agency said a sample of Boar’s Head liverwurst from a Maryland store tested positive for listeria.

The company is also recalling deli-sliced meats made the same day on the same line as the contaminated liverwurst at a Virginia plant, the USDA said. The sample was from an unopened package, collected by health officials as part of an investigation into the listeria outbreak.

Testing is underway to determine if the liverwurst sample is connected to the outbreak, health officials said.

"We are cooperating fully with government authorities and conducting our own investigation into this incident,” the Sarasota, Florida-based company said in a statement.

Stop & Shop's delis did not open as scheduled Friday morning, allowing for deep cleaning the areas following Boar’s Head’s recall, the grocer said Friday.

The delis in the grocer's 50 Long Island supermarkets were being reopened Friday afternoon, while the other 341 stores were reopened by Friday evening, the Quincy, Massachusetts-based grocer said.

"Stop & Shop is in the process of removing all impacted products from sale. In an abundance of caution, because this product is sliced in store, we are also in the process of discarding all other open deli meats and cheeses that could have been sliced or prepared in the same area and doing a deep cleaning of the deli," Stop & Shop said in a statement Friday.

Stop & Shop has stores in New York, Connecticut, Massachusetts, New Jersey and Rhode Island. The grocer is the largest supermarket chain on Long Island.

The listeria outbreak was first reported last week. Since late May, 34 people were sickened across 13 states, with all but one hospitalized. Two people died — in Illinois and New Jersey. It can take weeks for symptoms to develop symptoms so there may be more cases, officials said.

People most commonly reported eating deli-sliced turkey, liverwurst and ham, officials said.

Listeria can contaminate food and sicken people who eat it. Symptoms include fever, muscle aches, nausea and diarrhea. It can be treated with antibiotics, but it is especially dangerous to pregnant women, newborns, the elderly and those with compromised immune systems.

An estimated 1,600 people get listeria food poisoning each year and about 260 die, according to the Centers for Disease Control and Prevention.

The Boar's Head recall of over 200,000 pounds shipped nationwide applies to meats sliced at a deli counter, not prepackaged meats. It includes a number of multi-pound packages stamped with an Aug. 10 sell-by date, including bologna, garlic bologna, beef bologna, beef salami, Italian Cappy-style ham and Extra Hot Italian Cappy-style ham. Also included is Steakhouse Roasted Bacon Heat and Eat, with a sell-by date of Aug. 15.

The company said customers should throw away the recalled products, or return them to the store for a refund. Health officials said refrigerators should be thoroughly cleaned to prevent contamination of other foods.

With Tory N. Parrish

Suffolk Police Officer David Mascarella is back on the job after causing a 2020 crash that severely injured Riordan Cavooris, then 2. NewsdayTV's Andrew Ehinger and Newsday investigative reporter Paul LaRocco have the story. Credit: Newsday/Kendall Rodriguez; Jeffrey Basinger, Ed Quinn, Barry Sloan; File Footage; Photo Credit: Joseph C. Sperber; Patrick McMullan via Getty Image; SCPD; Stony Brook University Hospital

'It's disappointing and it's unfortunate' Suffolk Police Officer David Mascarella is back on the job after causing a 2020 crash that severely injured Riordan Cavooris, then 2. NewsdayTV's Andrew Ehinger and Newsday investigative reporter Paul LaRocco have the story.

Suffolk Police Officer David Mascarella is back on the job after causing a 2020 crash that severely injured Riordan Cavooris, then 2. NewsdayTV's Andrew Ehinger and Newsday investigative reporter Paul LaRocco have the story. Credit: Newsday/Kendall Rodriguez; Jeffrey Basinger, Ed Quinn, Barry Sloan; File Footage; Photo Credit: Joseph C. Sperber; Patrick McMullan via Getty Image; SCPD; Stony Brook University Hospital

'It's disappointing and it's unfortunate' Suffolk Police Officer David Mascarella is back on the job after causing a 2020 crash that severely injured Riordan Cavooris, then 2. NewsdayTV's Andrew Ehinger and Newsday investigative reporter Paul LaRocco have the story.