Parasite Review#1 (pt. 3)

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Parasite Review#1 (pt. 3)
2013-02-05 15:17:59

Parasite Lab practical review
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  1. Family Ascarididae
       Ascaris Lubricoides
    • Among largest 
    • eggs with mammilated layer
    • VERY resistant eggs
    • 3 lips and large spicules
  2. Family Ascarididae
      Toxocara canis
    • Smaller than ascaris sp.
    • Variation in J3 migration
    • visceral larval migrants (worse than cutaneous larval migrants)
  3. P Nematoda
      O ascaridida
       Ascaris lumbricoides eggs
    • Note distinctive mammillated layer
  4. P Nematoda
      O ascaridida
       Ascaris lumbricoides female
    • Note eggs in two uteri in x-section
  5. P Nematoda
      O ascaridida
       Ascaris lumbricoides male
    • Note this x section is smaller than the female and also does not contain eggs
  6. P Nematoda
      O Oxyurida
        F Oxyuridae
          Enterobius vermicuaris
    • Males come from haploid unfertilized eggs
    • females have slender pin-like tail
    • auto and retroinfection
  7. P Nematoda
       F Oxyuridae
         Enterobius vermicularis female bulb
    • Note prominent esophageal bulb
  8. P Nematoda
      O Oxyurida
        Enterobius vermicularis female

     Note "pin" - transparent caudal alae
  9. P Nematoda
      O Oxyurida
        Enterobius vermicularis male
    • Note that, although males don't have the "pin", they still have transparent caudal alae
  10. P Nematoda
      O Oxyurida
        Enterobius vermicularis egg
    • Note flattened margin (sometimes flattening only visible on juvenile worm within)
  11. Family trichuridae (whipworm)
    • Posterior end- thick like handle
    • Anterior- thin like whip
  12. Family Trichuridae
       Trichuris trichiura
    • Large esophagus
    • J1 in eggs are ingested (infective stage)
    • 30-50mm
  13. P Nematoda
      O Enoplida (whipworms)
        Family Trichuridae
          Trichuris trichiura female

    Note lack of curling of "whip handle"
  14. P Nematoda
      O Enoplida (whipworms)
       Family Trichuridae
    Trichuris trichiura male

    • Note single spicule of male
    • Note that male has a curling posterior end
    • Note male's more gradual transmission from "whip" to "whip handle"
  15. P Nematoda
      O Enoplida (whipworms)
      Family Trichuridae

     Trichuris trichiura egg
    • Note polar knobs
  16. Family Trichinellidae
       Trichinella spiralis
    • Juveniles are intracellular
    • form Nurse cell- nusery for parasite;l takes over cell; becomes growth chamber
    • Female is ~2x larger than male
    • ovoviviparous (young grows internally)
    • various LCs
    • zoonotic- dead end host, generally from eating meat
    • same individual can serve as DH and IH
    • Males have psuedo bursa
  17. P Nematoda
      O Enoplida
        Trichinella spiralis (cross section)

    larva curled up inside a host "nurse cell"
  18. P Nematoda
      O Strongylida
       F Trichostrongylidae
    • Hosts ingest 3rd stage juveniles to become infected
    • juveniles do not migrate through tissues
    • Have developmental arrest
    • Females ahve vulva flap
    • Haemonchus contortus
  19. Life cycles of some Platyhelminthes
    • Turbelarians- Direct
    • Fecampiida- protelean parasite
    • Monogenea- Direct (have oncomiracidium larvae -> adult)
  20. Life cycle of trematodes
    • Trematodes
    •     Digenea
    •          Feces- egg --> miracidium
    •          1 IH (snail)- sporocyst/redia
    •                          Cercaria
    •          2IH- metacercaria
    •          DH- Adult
  21. Cestodes
        Cestodaria- monozoic
        Eucestoda- feces- eggs -> oncosphere
               1IH- procercoid stage
               2IH- pleurocercoid stage
               DH- Adult
               IH- Cysticercoid/cus
               DH- Adult
    Life cycles of cestodes
  22. Life Cycle of Nematodes
    Direct Life Cycle
  23. Phylum Rhomobozoa life cycle
    • Nematogen stage- vermiform larvae
    • Rhombogen stage - infusoriform larvae
  24. P Orthonectida LC
    Direct- parasitic castrators