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LEC 1 Relationships, Zoonosis, Immunoparasitology, (2) Finish all of right…

- - - - in the immunocompetent host, it is either
        found in a latent form or causes a self-limiting disease (Toxoplasma gondii).
      - produce disease in an immunodeficient
        host (like AIDS and cancer patients).
- - - - mechanical vector (not essential to the life cycle)
      - biological vector (essential)
- - - - Ectoparasites
        
        most parasitic arthropods belong to this category
        
        relationship is an infestation
        
        Live on skin of hosts
        
        The nature and extent of the pathological effects are dependent upon
        
        site of infection
        
        mode of infection
        
        level of the parasite burden
    - - parasites of the digestive tract, extraintestinal organs and tissues, and those that are intracellular within the host
        and produce infection, irrespective of their size.
      - Protozoan
      - Helminthic
        
        segmented tape-like worms (Cestodes)
        
        cylindrical worms (Nematodes or roundworms)
        
        flatworms (Trematodes)
        
        premunition or concomitant immunity
        
        a state wherein the host is protected from further infection with a given species by ongoing persistent infection with the same organism.
        
        Parasites of the primary infection induce an immune response that, while incapable of killing them, is nevertheless able to kill incoming parasites that may cause a superinfection.
        
        primary infection alters the anatomy or physiology of the host in such a way that it becomes more difficult for incoming larval organisms to establish infection in the appropriate niche