A possible risk of raw feeding is that of human infection caused by direct or indirect exposure to bacterial pathogens in raw meat and animal stools. A small study investigated the levels of "Salmonella" in the stool of 10 dogs that ate a raw diet. It was found that 80% of the raw diets tested positive for "Salmonella" and 30% of the stool samples from dogs fed raw food contained "Salmonella". None of the control dogs fed a commercial feed contained "Salmonella". The authors of the study concluded that dogs on a raw food diet may be a source of environmental contamination, although they caution about the generalizability of their results due to the small number of dogs studied.