Two more people have been infected with a strain of Salmonella, Salmonella typhimurium, found in ground beef sold at Hannaford grocery stores. This brings the total number of cases to 16. This particular strain is antibiotic-resistant, which makes it very dangerous, potentially causing increased risk of treatment failure and hospitalization.
The USDA has not been able to determine the source of the contaminated beef. Supermarkets combine ground meats from more than one source to create blends with varying fat levels. That can make it very difficult to find the origin of meats.