What type of bacteria is commonly found on ground beef?

The bacteria commonly found on ground beef include Escherichia coli (E. coli), Salmonella, and Listeria monocytogenes. E. coli, particularly the strain O157:H7, is of significant concern due to its potential to cause severe foodborne illness. These bacteria can contaminate meat during processing or handling, emphasizing the importance of proper cooking and food safety practices to reduce the risk of infection.