The U.S. Centers for Disease Control has confirmed that 33 people from seven states were sickened last month by a strain of salmonella enteritidis linked to contaminated ground beef sold at Hannaford and other stores.

Cargill Beef recalled 29,000 pounds of 85 percent lean ground beef produced at a Pennsylvania processing facility on May 25 and linked to the salmonella outbreak.

The CDC said one of 33 people sickened was from Maine, though state epidemiologist Dr. Stephen Sears said two people in the state — from Kennebec and Sagadahoc counties — were infected with the strain.

He said the federal agency is “more conservative” than the state when it comes to confirming that cases are linked to an outbreak.

According to the CDC, the outbreak also sickened 14 people in New York, 10 in Vermont, three in Massachusetts, two in New Hampshire, two in Virginia and one in Rhode Island.

The onset of the illnesses occurred between June 6 and 26. Eleven people were hospitalized. No one has died.

The sickened people range in age from 12 to 101 years old, the CDC said.

Twenty-six of them reported eating ground beef in the week before their symptoms appeared, and 17 reported purchasing that beef from Hannaford. Nine recalled that they ate 85 percent lean ground beef.

The U.S. Department of Agriculture has only identified Hannaford stores in five states on its list of retailers that sold the beef. Cargill, however, said it sold the product to a “handful” of other distributors in the Northeast that would have sold to other smaller grocery stores.