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VM638 Parasitology > Final - Helminths > Flashcards

Final - Helminths Flashcards

1
Q

Phylum Acantocephala characteristics

A
  • long, round, unsegmented body
  • anterior spiny proboscis
  • pseudocoel
  • no digestive tract
  • dioecious sexes
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2
Q

Phylum Platyhelminthes, Class Trematoda characteristics

A
  • dorsoventrally flat, unsegmented body
  • acoelomate
  • incomplete digestive tract
  • monecious with exceptions
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3
Q

Phylum Platyhelminthes, Class Cestoda characteristics

A
  • dorsoventrally flat, segmented body
  • acoelomate
  • no digestive tract
  • monecious
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4
Q

Phylum Nemathelminthes

A
  • long, round, unsegmented body
  • pseudocoel
  • complete digestive tract
  • dioecious sexes
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5
Q

Pseudocoelomate

A
  • formed from blastocoel
  • fluid filled hydrostatic skeleton
  • no circulatory system
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6
Q

Aceolomate

A
  • no cavity

- space filled with mesenchymal parenchyma and organs suspended in it

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7
Q

Nematode life cycle

A

universal:

  1. Eggs in feces
  2. convert to L1, L2, infective L3 in environment
  3. L3 is eaten, converts to L4, Immature adult, Mature adult in 2-3 weeks
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8
Q

Genra that cause ruminant strongyles

A 
Haemonchus
Ostertagia/Telodorsagia
Trichostrongylus
Cooperia
Oesophagostomum
(Nematodirus)
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9
Q

Ruminant strongyle genra found in abomasum

A

Haemonchus
Ostertagia/Telodorsagia
Trichostrongylus

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10
Q

Ruminant strongyle genra found in small intestine

A

Trichostrongylus

Cooperia

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11
Q

Ruminant strongyle genra found in Large intestine

A

Oesophagostomum

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12
Q

Important ruminant strongyle species for sheep/goats

A

Haemonchus contortus

Teladorsagia circumcincta

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13
Q

Important ruminant strongyle species for cattle

A

Ostertagia ostertagi

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14
Q

Ruminant strongyles prepatent period

A

2-4 weeks (unless larvae arrests)

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15
Q

HOT CON larvae survival in environment

A
  • moisture seeking
  • heap, humidity = more active, use nutritents faster
  • can overwinter
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16
Q

Who is most likely to get ruminant strongyles?

A
  • 1st year grazing calves, lambs, kids (IS not exposed yet)
  • Bovine ostertagiosis also common in weanling/yearlings
  • Haemonchosis common in adults
17
Q

Clinical signs for ruminant strongyles

A
  • Parasitic Gastroenteritis (hyperplastic gastritis, catarrhal enteritis)
  • inappetence, rough hair coat, diarrhea, maybe anemia
  • subclinical infection = production loss
18
Q

Diagnose ruminant strongyles

A
  • strongyle-type eggs on fecal float
  • signs + grazing history + seasonality of parasite
  • don’t always see parasites on necropsy

VM638 Parasitology (2 decks)

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