Ostertagia ostertagi Flashcards

1
Q

class

A

nematoda

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2
Q

order

A

strongylida

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3
Q

common name

A

brown stomach worm

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4
Q

hosts

A

cattle

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5
Q

ostertagia is important in _____ regions with winter rainfall

A

temperate and subtropical

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6
Q

adult characteristics

A

slender

reddish brown

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7
Q

size of adult

A

1cm

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8
Q

larvae are _____

A

microscopic

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9
Q

species differentiation based on _____

A

spicules in males

vulva in females

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10
Q

egg characteristics

A

trichostrongyloid
oval
85micrometers
thin shelled

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11
Q

life cycle direct or indirect?

A

direct

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12
Q

life cycle

A
eggs pass in feces 
develop to L3
L3 migrate to herbage 
ingested by cow during grazing
L3 develops in abomassal gland
2 molts occur
adult emerges from the gland
male and females mate
females lay eggs
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13
Q

if conditions are not favorable the ____ will arrest inside the host for up to 6 months

A

L4

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14
Q

site of infection

A

abomasum

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15
Q

pathogenesis

A

Caused primarily by L3 to immature adult in the gastric glands
Thickened gastric mucosa; raised nodules = “Moroccan leather”
Increased plasma pepsinogen

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16
Q

model life cycle

A

Trichostrongyloid , trichostrongyle, strongyloid, strongyle

17
Q

PPP

A

21 days

18
Q

clinical signs for type 1 disease

A

Summer Ostertagiosis
– In calves during first grazing season
– Profuse watery diarrhea
– Morbidity high

19
Q

clinical signs for type II disease

A

Winter Ostertagiosis
– In calves following first grazing season with arrested L4
– Profuse watery diarrhea
– More “bottle jaw”
– Clinical disease low, mortality high unless treatment instituted

20
Q

diagnosis

A

culture and identification of L3
fecal egg counts
Plasma pepsinogen levels elevated

21
Q

% adults to larvae high in _____ and low in____

A

Type 1, Type II

22
Q

treatment and prevention for type 1

A

Responds well to anthelmintics

move cattle

23
Q

treatment and prevention for type II

A

Requires anthelmintics

effective against arrested L4, larvae and adults

24
Q

to prevent create a ____ pasture

A

safe