Regarding chronic carriers of Salmonellosis, which statement is correct?

• A. Chronic carriers are rare in humans but prevalent in animals and birds.
• B. Chronic carriers are common in humans and rare in animals.
• C. Chronic carriers do not occur in humans.
• D. Chronic carriers are equally common in humans and animals.

Answer: (A)

Chronic carriers are people or animals that continue to harbor and shed Salmonella long after illness. In humans, chronic carriage is not common for most Salmonella infections; it does occur with typhoidal Salmonella (the classic typhoid carrier), but even then it’s relatively rare overall. In contrast, animals and birds can harbor Salmonella for extended periods and shed it continuously, making them important reservoirs in the food chain. Poultry, eggs, and dairy-related sources often reflect this animal reservoir. So the statement aligns with what is observed: chronic carriage is rare in humans (except certain typhoidal cases) but more commonly persists in animals and birds, which is why this choice is the best.