While the intense heat used in manufacturing pet food or cooking meat destroys any potential bacteria, raw meats may contain bacteria that can be unsafe for both dogs and cats. The United States government reported that in 2006, 16.3% of all chickens were contaminated with "Salmonella". A study on 25 commercial raw diets for dogs and cats detected "Salmonella" in 20% and "Escherichia coli" in 64% of the diets. However, the "E. coli" strain that can cause severe illness was not tested.. An example of the severity of "E. coli" O157:H7 infections can be seen in affected greyhound racing dogs fed raw meat as part of their diet. Known as "Alabama rot", this disease presents as severe vasculitis, cutaneous necrosis, renal failure and death. A contributing factor might be that racing greyhounds are typically fed raw meat classified as "not for human consumption", which may contain higher than normal levels of bacteria.