Parasites of large intestine of ruminant & pigs - Oesophagostomum Flashcards
(24 cards)
What Oesophagostomum species affects sheep, goat, camel, and antelope?
Ruminants
Oesophagostomum columbianum
This species is commonly found in ruminants.
Which species of Oesophagostomum does NOT produce nodules?
Ruminants
Oesophagostomum venulosum
This species infects sheep, goat, deer, and camel.
What is the size range of Oesophagostomum species?
Ruminants
6.5-22 mm
They are classified as small.
Where do adult Oesophagostomum reside in their definitive host?
Ruminants
Cecum
Larvae are found in the pyloric-rectum.
What is the appearance of Oesophagostomum eggs?
Ruminants
Medium, oval, symmetrical with two thin shells, unembryonated (16-32 blastomeres), greyish-brown
They contain 16-32 blastomeres.
What is the life cycle of Oesophagostomum?
Ruminants
Egg is shed in feces, hatches and moults from L1 to L3, L3 is the infective stage and is ingested by ru
The L3 larva is ingested by the ruminant.
What are the reproductive characteristics of Oesophagostomum?
Ruminants
Male: Bursa well developed
Female: Tail is straight
This feature assists in reproduction.
What are common clinical signs of Oesophagostomum infection?
Ruminants
Diarrhea, weight loss
Severe cases may lead to further complications.
What treatments are effective against Oesophagostomum?
Ruminants
Ivermectin, Pyrantel, Benzimidazoles
These are commonly used anthelmintics.
How is Oesophagostomum diagnosed?
Ruminants
Coprocultures, necropsy
Coprological examination is crucial for diagnosis.
In which regions is Oesophagostomum of ruminants commonly found?
Africa, Brazil, China, Indonesia, Philippines
It is prevalent in various geographical locations.
What order do Oesophagostomum species belong to?
Strongylida
This order includes various parasitic worms.
What are the species of Oesophagostomum affecting pigs?
- O. dentatum
- O. brevispiculum
- O. quadrispinulatum
This species primarily targets pigs.
What is the size range of Oesophagostomum species that infect pigs?
8-15 mm
They are also considered small.
What type of egg do Oesophagostomum species affecting pigs produce?
- Medium
- ovoid, symmetrical
- 2 thin shells
- Unembryonated with many blastomeres
This differs from the eggs of ruminant-infecting species.
What is the life cycle type of Oesophagostomum affecting pigs?
Direct
This means there are no intermediate hosts.
What pathogenesis occurs due to Oesophagostomum in pigs?
Deep penetration of larvae in large intestine, inflammatory reactions, lymphoid-type nodules.
Result in stenosis of intestine.
Bad intestinal enzymatic activity.
How long can Oesophagostomum larvae survive in the environment?
Pigs
Resistant larvae survive in the environment for: A year or more
This resistance contributes to the persistence of infections.
What are the clinical signs of severe Oesophagostomum infection in pigs?
Diarrhea, weight loss, death
These can occur shortly after severe infection.
What treatments are effective against Oesophagostomum in pigs?
Ivermectin, Benzimidazoles
Similar treatments are used as for ruminants.
How is Oesophagostomum diagnosed in pigs?
Necropsy, coprological examination
These methods are essential for confirming infection.
What is the geographical distribution of Oesophagostomum affecting pigs?
Worldwide
This indicates a broad prevalence across different regions.
Oesophagostomum species of ruminants
- O. columbianum: sheep, goat, camel, antelope
- O. venulosum: sheep, goat, deer, camel
- O. asperum: sheep, goat
- O. multifoliatum: sheep, goat
- O. radiatum: cow, buffalo
Location of oesophagostomum species affecting pigs
large intestine and cecum
