Nematodes Flashcards

- key characteristics - direct or indirect life cycle? - identify types of hosts in a life cycle - identify methods used to ensure the survival of their species - Ancylostoma caninum - primary clinical signs - primary modes of infection - relate morphology & behavior to pathology and clinical signs

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1
Q

Phylum Nematoda

A

roundworms

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2
Q

live extracellularly

A

in the GI-tract and organs

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3
Q

sexual reproduction

A
  • nematodes: males and females
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4
Q

oviparous

A

egg-laying

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5
Q

vivparous

A

lay live young

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6
Q

Nematodes (roundworms)

A
  • free-living or parasitic
    • soil, plant, animal nematodes
  • elongate/cyndrical
  • alimentary canal present
  • sexes usually separate
  • life cycle: direct or indirect
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7
Q

alimentary canal

A

?

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8
Q

key characteristics

A

??

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9
Q

life cycle

A

E - L1 - L2 - L3 - L4 - L5 - Adult

  • L1 = mff; L5 = immature adult
  • insert host(s)
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10
Q

direct life cycle

A
  • infective larva (usually L3)

- infective larva in an egg (usually L2)

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11
Q

indirect life cycle

A
  • L1 infective to intermediate host

- L3 to the final host

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12
Q

how they ensure offspring get in a host

A
  • periparturient rise
  • survival of eggs with larva
  • paratenic hosts
  • transmammary, transplacental
  • avoid immune system/bad weather
    • arrested development (hypobiosis)
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13
Q

Ancylostoma caninum

A
  • round; elongated; males and females
  • buccal cavity: teeth
  • size: 1-2 cm
  • bursa: yes
  • host: caninum -> dogs
  • mode of infection: many modes
  • predilection site: adult small intestines; larvae migrate in lungs
  • food: adults blood
  • life cycle: direct
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14
Q

Ancylostoma caninum - direct life cycle

A
  • 5 modes of infection
    1. percutaneous or penetration of oral mucosa
    2. per os
    3. paratenic hosts (rodents)
    4. transplacental (rare)
    5 transmammary (important)
  • arrested development
  • lung migration
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