Streptococci are known to originate from several natural sources, including humans and diverse animals. These bacteria often colonize on the mucosal surfaces of the mouth, nasal passages, intestinal tract, and pharynx. Moreover, the bacteria may also cause contamination of drinking water due to feces. Food products which are at high risk of contamination include milk and dairy products, steamed lobster, eggs, potato salad, ground ham, rice pudding custard, and shrimp salad. Some streptococci are commercially important for the production of cheese and yogurt, though are known to be potent pathogen.