Diseases & National Health Programme
Type of biological transmission in Filariasis?
Disease agent undergoes cyclical change only, but does not multiply in the body of the vector.
E.g. Filarial parasite (Culex mosquito), Guinea worm (Cyclops)
Mechanical Transmission: The disease agent is transmitted mechanically by the arthropod.
The transmission of diarrhea, dysentery, typhoid, food poisoning and trachoma by the housefly – are examples of mechanical transmission of the disease agent by the vector.
1. Propagative: When the disease agent undergoes no cyclical change, but multiplies in the body of the vector, transmission is said to be propagative, e.g. plague bacilli in rat fleas.
2. Cyclo propagative: The disease agent undergoes cyclical change, and multiplies in the body of the arthropod, e.g. malaria parasite in anopheline mosquito.