Ostertagia ostertagi Flashcards Preview

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Flashcards in Ostertagia ostertagi Deck (24):
1

class

nematoda

2

order

strongylida

3

common name

brown stomach worm

4

hosts

cattle

5

ostertagia is important in _____ regions with winter rainfall

temperate and subtropical

6

adult characteristics

slender
reddish brown

7

size of adult

1cm

8

larvae are _____

microscopic

9

species differentiation based on _____

spicules in males
vulva in females

10

egg characteristics

trichostrongyloid
oval
85micrometers
thin shelled

11

life cycle direct or indirect?

direct

12

life cycle

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

13

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

L4

14

site of infection

abomasum

15

pathogenesis

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

16

model life cycle

Trichostrongyloid , trichostrongyle, strongyloid, strongyle

17

PPP

21 days

18

clinical signs for type 1 disease

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

19

clinical signs for type II disease

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

diagnosis

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

21

% adults to larvae high in _____ and low in____

Type 1, Type II

22

treatment and prevention for type 1

Responds well to anthelmintics
move cattle

23

treatment and prevention for type II

Requires anthelmintics
effective against arrested L4, larvae and adults

24

to prevent create a ____ pasture

safe