This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Epidemiology, Subject name: Social & Preventive Medicine
The type of transmission involved in the case of plague in rat flea- 
Select and explain. 
A. Propagative, B. Cyclo propagative, C. Cyclo-Developmental, D. None
A: Propagative
Answer: A: Propagative 
Explanation: propagative life cycle is the one in which the agent merely multiplies in vector ,but no change in form that is in the case of plague bacilli in rat fleas.parks textbokk,22 nd ed,pg no 94