This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Microbiology
Absence of Vi-antibody in a typhoid patient has: 
Select and explain. 
A. Good prognosis, B. Bad prognosis, C. No relation with prognosis, D. Indicates widal negative
B: Bad prognosis
Answer: B: Bad prognosis 
Explanation: Ans. is. 'b' i. e., Bad prognosis