Which bacterial pathogen is listed as carried by swine?

• A. Yersinia enterocolitica
• B. Escherichia coli
• C. Bacillus subtilis
• D. Staphylococcus aureus

Answer: (A)

Pigs can carry certain bacteria in their intestines, which can contaminate pork and cause illness in people. Yersinia enterocolitica is a well-known reservoir in swine, making pork products a common source if they’re undercooked or cross-contaminated. This strong association with swine distinguishes it from the other options: Escherichia coli is widespread and found in many animals and environments, not specifically tied to swine; Bacillus subtilis is primarily an environmental soil bacterium; Staphylococcus aureus is commonly carried by humans and various animals but is not specifically identified as a swine-associated pathogen in this context. So the best answer is Yersinia enterocolitica.