More cases of salmonella infections have been reported in an outbreak linked to ground beef sold at Hannaford Supermarkets.

In total, 16 people from seven states, including four from Maine, have reported becoming ill between Oct. 8 and Dec. 3 and tested positive for a rare strain of salmonella, according to the U.S. Centers for Disease Control and Prevention.

Of the those people, 10 said they ate ground beef from Hannaford stores and seven were hospitalized.

Fourteen cases were intially linked to the outbreak, but state epidemiologist Dr. Stephen Sears said he believes a case in Ohio is no longer considered connected. The cases most recently linked to the outbreak were reported  in New York, New Hampshire and Massachusetts.

Hannaford issued a recall last week of ground beef with a sell-by date of Dec. 17 or earlier and is offering full refunds for the meat, regardless of whether it’s still in its package.