2.1. *Strongyloides*, *Strongylus*

Question 1

Answer 1

Strongyloides

Question 2

Answer 2

Pg sits on position to ease the breathing. Can be sign of strogyloidosis (Strongyloides ransomi)

Question 3

Answer 3

Haemorrhagic pneumonia in pig because of larvae in the lung tissue (Strogyloides ransomi)

Question 4

Answer 4

Cachexia can be sign of strongyloidosis Strongyloides westeri

Question 5

Answer 5

Cross-section of nematode in mucosa. Can not be identified by this

Question 6

Answer 6

Bifurcated tail of L3 of Strogyloides

Question 7

Large vs small strongylus

Answer 7

Large strongylus have extra intestinal migration.
From the intestines —> pierce intestinal wall —> bloodstream —> cranial mesenteric artery (Strongylus vulgaris) where its buries itself in the artery —> nodule where its gonna moult to L4 and will be dormant for a long time, this module can call thrombosis

Large and small strongylus can’t be differentiated by eggs. L3 can be differentiated (number of gut cells!!)

Question 8

Difference in numbers of gut cels in different L3 strongylus

Answer 8

big amount of gut cells -> large strobgylus

32 -> Strongylus vulgaris
20 -> Strongylus edentatus
16 -> Strongylus equinus
8 -> small strongylus

Question 9

Answer 9

Adult Strongylus vulgaris because 2 teeth in buccal capsule !!!

Question 10

Answer 10

1 - Aneurism created by L3 larvae in cranial mesenteric artery. Strongylus vulgaris
2 - adult Strongylus vulgaris on the intestinal wall (caecum/colon)

Question 11

Answer 11

Nodules in the wall of cranial mesenteric artery caused by Strongylus vulgaris larvae

Question 12

Answer 12

Thrombosis caused by Strongylus vulgaris

Question 13

Answer 13

Subserosa of liver is the predilection site of Strongylus equinus
(also subserosa of colon, abdominal cavity and pancreas)

Question 14

Answer 14

Adult Strongylus equinus 4 teeth !

Question 15

Answer 15

Adult Strongylus edentatus No teeth!

Question 16

Answer 16

Predilection site of Strongylus edentatus larvae is peritoneum

Question 17

Number of teeth on different species of Strongylus

Answer 17

• Strongylus vulgaris* - 2
  Strongylus equinus - 4
  Strongylus edentatus - 0

Question 18

Life cycle of small strongylus

Answer 18

No extra intestinal migration -> less pathogenic than the large strongylus

In the caecum L3 will penetrate into the intestinal wall, stay dormant -> moult, become adults

Question 19

Answer 19

Small strongylus. Larvae and adults

Question 20

Answer 20

Nodules in the intestinal mucosa caused by small strongylus

Question 21

Answer 21

Damage caused by small strongylus

Question 22

Answer 22

Horse feces with small strongylus

Question 23

Answer 23

Strongylus (?) type egg

Question 24

Oesophagostomum species and hosts

Answer 24

• Pig -> O. dentatum, O. quadrispinulatum)
• Cattle -> O. radiatum
• Sheep, goat -> O. venulosum, O. columbianumm

Question 25

Answer 25

Oesophagostomum (but not O. columbianum)

Question 26

Answer 26

Oesophagostomum

Question 27

Answer 27

Chabertia ovina

Question 28

Answer 28

Nodules caused by Oesophagostomum

Question 29

Answer 29

Nodules caused by Oesophagostomum

Question 30

Answer 30

Adult small strongylus. Have smaller buccal capsule than large strongylus

Question 31

Answer 31

Large strongylus larvae inside of the thrombus

Question 32

Answer 32

Cross-section of the

Question 33

Answer 33

Oesophagostomum nodule filled with blood after hatching