Housefly, which lands on cow dung, contaminating its appendages with bacteria from the faeces, and then lands on food prior to consumption is an example for which type of vector: (A) Cyclo developmental, (B) Cyclo propagative, (C) Mechanical, (D) Propagative
Answer is C. Mechanical vector-picks up an infectious agent on the outside of its body and transmits it in a passive manner Cyclo propagative- pathogen undergoes cyclic changes and multiples in body of ahropod-e.g. : malarial parasite in female Anopheles mosquito Culex mosquito -filaria -cyclo developmental in which there is cyclical change and do not multiply in the body of vector Other e.g. guinea worm, Cyclops Ref: Arora.Medical parasitology 4th ed pg. 5