What is the single most important pre-disposing factor for Salmonella shedding?

What is the single most important pre-disposing factor for Salmonella shedding?

• A. Stress
• B. Age
• C. Diet
• D. Vaccination

Answer: (A)

Stress triggers Salmonella shedding because the body's response to stress lowers gut immune defenses and disrupts the normal microbial balance. When animals experience stress, they release glucocorticoids like cortisol, which can suppress mucosal immunity and reduce the ability to clear Salmonella from the intestinal tract. This creates an environment where Salmonella can persist and be shed in feces, even in carriers who aren’t visibly ill. Stress also tends to alter the gut environment—shifts in microbiota, changes in gut motility, and barrier function—that favor Salmonella growth and shedding. In practice, events like transport, crowding, weaning, and other management-related stressors are repeatedly linked to spikes in shedding across species. While age, diet, and vaccination can modulate risk or disease severity, they don’t provoke shedding as consistently or universally as stress, making it the most important pre-disposing factor.

Stress triggers Salmonella shedding because the body's response to stress lowers gut immune defenses and disrupts the normal microbial balance. When animals experience stress, they release glucocorticoids like cortisol, which can suppress mucosal immunity and reduce the ability to clear Salmonella from the intestinal tract. This creates an environment where Salmonella can persist and be shed in feces, even in carriers who aren’t visibly ill.

Stress also tends to alter the gut environment—shifts in microbiota, changes in gut motility, and barrier function—that favor Salmonella growth and shedding. In practice, events like transport, crowding, weaning, and other management-related stressors are repeatedly linked to spikes in shedding across species. While age, diet, and vaccination can modulate risk or disease severity, they don’t provoke shedding as consistently or universally as stress, making it the most important pre-disposing factor.