Describe the course of parasitic infection along with the importance of each stage.

Parasitic infections follow a specific course that involves several stages, each playing a crucial role in the parasite's survival, reproduction, and pathogenicity within the host. The typical stages of a parasitic infection include transmission, entry, establishment, replication, host interaction, immune response, and resolution or chronic infection. Understanding each stage is essential for diagnosis, treatment, and control of parasitic diseases.  

1. Transmission:  
The infection begins when the parasite moves from one host to another. Transmission routes vary depending on the parasite type, including ingestion of contaminated food or water (e.g., *Giardia lamblia*), vector-borne transmission (e.g., *Plasmodium* spp. via mosquitoes), direct skin penetration _________ ___ __________ _______ _________ ______ __________ __________ ___.
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