This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Systemic Bacteriology (Gram Positive Bacilli, Gram Negative Bacilli), Subject name: Microbiology
In which of the following sites is Salmonella typhi most likely to be found during the carrier state? 
Select and explain. 
A. Blood, B. Gallbladder, C. Kidney, D. Liver
B: Gallbladder
Answer: B: Gallbladder 
Explanation: Salmonella typhi is the most likely to be found in gall bladder during the carrier state. Carriage: Up to 5% of patients become carriers. - The carrier state is more common in women than in men and in the older people (over 40 years) than in young people. - Carriers usually harbour the organisms in the gallbladder or biliary tract. - Type of Carriers:- Convalescent - shed bacilli for 3 weeks-3 months after clinical cure. Temporary - shed bacilli for 3 months to 1 year after clinical cure. Chronic - shed bacilli for more than 1 year. - Carriers can be diagnosed by stool/ urine culture or sewer swab culture. - Treatment of carriers: Ampicillin or Amoxicillin + probenecid for 6 months.