2.1. *Strongyloides*, *Strongylus* Flashcards
Strongyloides
Pg sits on position to ease the breathing. Can be sign of strogyloidosis (Strongyloides ransomi)
Haemorrhagic pneumonia in pig because of larvae in the lung tissue (Strogyloides ransomi)
Cachexia can be sign of strongyloidosis Strongyloides westeri
Cross-section of nematode in mucosa. Can not be identified by this
Bifurcated tail of L3 of Strogyloides
Large vs small strongylus
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!!)
Difference in numbers of gut cels in different L3 strongylus
big amount of gut cells -> large strobgylus
32 -> Strongylus vulgaris
20 -> Strongylus edentatus
16 -> Strongylus equinus
8 -> small strongylus
Adult Strongylus vulgaris because 2 teeth in buccal capsule !!!
1 - Aneurism created by L3 larvae in cranial mesenteric artery. Strongylus vulgaris
2 - adult Strongylus vulgaris on the intestinal wall (caecum/colon)
Nodules in the wall of cranial mesenteric artery caused by Strongylus vulgaris larvae
Thrombosis caused by Strongylus vulgaris
Subserosa of liver is the predilection site of Strongylus equinus
(also subserosa of colon, abdominal cavity and pancreas)
Adult Strongylus equinus 4 teeth !
Adult Strongylus edentatus No teeth!
Predilection site of Strongylus edentatus larvae is peritoneum
Number of teeth on different species of Strongylus
- Strongylus vulgaris* - 2
Strongylus equinus - 4
Strongylus edentatus - 0
Life cycle of small strongylus
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
Small strongylus. Larvae and adults
Nodules in the intestinal mucosa caused by small strongylus
Damage caused by small strongylus
Horse feces with small strongylus
Strongylus (?) type egg
Oesophagostomum species and hosts
- Pig -> O. dentatum, O. quadrispinulatum)
- Cattle -> O. radiatum
- Sheep, goat -> O. venulosum, O. columbianumm
Oesophagostomum (but not O. columbianum)
Oesophagostomum
Chabertia ovina
Nodules caused by Oesophagostomum
Nodules caused by Oesophagostomum
Adult small strongylus. Have smaller buccal capsule than large strongylus
Large strongylus larvae inside of the thrombus
Cross-section of the
Oesophagostomum nodule filled with blood after hatching