North American Veterinary Licensing Examination (NAVLE) Practice Test

Rectal stricture in pigs is primarily associated with Salmonella typhimurium. This bacterium can cause a variety of gastrointestinal issues, leading to inflammation and necrosis of the intestinal lining. The resulting scarring and tissue damage can lead to strictures, where the rectum becomes narrowed, making it difficult for the pig to pass feces.

Understanding the impact of Salmonella typhimurium is crucial, especially since it can also lead to systemic disease and significantly affect overall health and productivity in swine. In contrast, while the other conditions listed can cause gastrointestinal symptoms, they are less commonly associated with the formation of strictures specifically in the rectum. For instance, rotavirus primarily causes diarrhea in piglets, intestinal spirochetosis leads to colitis, and coccidiosis primarily affects the intestinal tract but does not directly result in rectal strictures. Thus, Salmonella typhimurium stands out as the key condition connected to this specific complication in pigs.