**Abstract**

The parasitic life cycle of helminths greatly relies on sophisticated manipulation of host environment and successful evasion of host defense. Helminths produce a repertoire of secretory molecules (including, extracellular vesicles and/or exosomes) to invade and generate habitable host-environment, and also to modulate the host immune responses in such a way that ensures their prolonged survival within host. An outline on helminths derived immune-modulatory molecules and their implications in host-parasite crosstalk have been presented. Queries with regard to the new direction of investigation to reveal specific molecular strategies, used by helminths to manipulate the host systems are also discussed.

**Keywords:** helminthiasis, host parasite interaction, secretory molecules
