How are Salmonella spp. typically transmitted from animals to humans?

• A. By the inhalation of aerosols
• B. By the fecal-oral route
• C. Through direct blood contact
• D. Through skin contact

Answer: (B)

Salmonella is transmitted mainly through the fecal-oral route. The bacteria are shed in animal feces and can contaminate food, water, or surfaces. When people ingest material contaminated with this feces—such as undercooked poultry or eggs, unpasteurized dairy, contaminated produce, or food handled with contaminated hands—infection can occur. This route fits real-world patterns where animals harbor Salmonella in their intestines and pass it to humans through ingestion.

Inhalation of aerosols, direct blood contact, or skin contact are not typical ways Salmonella spreads from animals to humans. Aerosols can occur in special lab settings but are not the common route for enteric Salmonella infections. Blood contact is not a usual transmission path, and intact skin is not a portal for infection with Salmonella unless there’s a break and subsequent ingestion, which is not the standard route.