This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: VBDs, Arboviral & Viral Infections, Surface Infections, Subject name: Social & Preventive Medicine
Which of the following is true about Endemic typhus? 
Select and explain. 
A. Cause is Rickettsia prowazekii, B. Vector is flea, C. Reservoir is humans, D. Tetracycline is not useful for treatment
B: Vector is flea
Answer: B: Vector is flea 
Explanation: Endemic typhus Also known as: Flea-borne typhus, murine typhus Causative agent: Rickettsia typhi Vector: rat flea Reservoir: Rodents Weil felix reaction becomes +ve in : 2nd week Drug of choice: Tetracycline.