This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Communicable diseases, Subject name: Social & Preventive Medicine
Which of the following is true about typhoid? 
Select and explain. 
A. Fecal carriers are less common, B. Vi antibodies are present in about 80% of chronic carriers, C. Gall bladder usually not involved in carrier state, D. Tetracycline is the DOC for carriers
B: Vi antibodies are present in about 80% of chronic carriers
Answer: B: Vi antibodies are present in about 80% of chronic carriers 
Explanation: Convalescent carriers excrete the bacilli for 6-8 weeks.Persons who excrete the bacilli for more than a year after a clinical attack are called chronic carriers.In chronic carriers, the organism persists in the gallbladder. Vi antibodies are present in about 80% 0f chronic carriersFecal carriers are more frequent than urinary carriers. The chronic urinary carrier state is often associated with some abnormality of the urinary tract.Ampicillin or amoxicillin + Probenecid for 6 weeks achieve eradication in 70% of chronic carriersPark 23e pg: 236