Gastrointestinal Helminth Nematodes Flashcards
(63 cards)
Most common gastrointestinal helminth parasites in dogs
Toxocara Canis
Toxascaris leonine
Baylisascaris (raccoons)
Toxocara catis
Where do dogs get toxocara cati
From cats
Can cats get toxocara canis
No
How do dogs get baylisascaris?
From raccoons
What is the most common gastrointestinal helminth parasites in dogs
Toxocara canis
Most common helminth gastrointestinal parasites in cats
Toxocara Cati
Toxoscaris leonine
How do dogs get infected by ascarids?
Ingesting larvated eggs in environment
Ingesting other vertebrate that ingested other eggs (mouse, rabbit) -larvated eggs are in their muscle
Milk ingestion from infested mother (toxocara canis and cati) possibly baylisascaris
Placenta transmission (toxocara canis / baylisascaris
What ascarids migrate into the circulatory system and lay dormant (encrusted) until reactivated
All except toxascaris leonine
Where can dewormers kill parasites
Only the parasites in the GI tract, not the ones that are dormant in the muscles
What happens when a female becomes pregnant
Dormant eggs in muscle become activated and enter puppies and kittens through placenta and milk
Which helminths are in the milk
Toxocara canis and cati
Baylisascaris
Where do eggs develop into larva once digested
In the intestines
Where do larva go once developed in intestines
Into intestinal lining and end up in circulatory system
Where do larva go once in the circulatory system
In many organs (lungs/liver)
What happens once larva make it to lungs
They are coughed up and swallowed
What happens once larva are coughed up and swallowed?
They develop into adults in digestive system and produce eggs to infect environment
Does migration cause any problems in dog
Causes damage to tissues when larva move around body
Difference between vertebrate host ingestion and egg migrationb
If vertebrate host ingested (mouse/rabbit), eggs go straight into intestines of new host and form adult worms without any migration throughout body
What can act as a paratenic host?
Earthworms
Invertebrates
How are earthworms and invertebrates paratenic hosts
They may get ingested directly by dog/cat or by a rodent/bird which can be a paratenic host for dog or cat to eat after
How many paratenic hosts and transport hosts are there
There can be multiple paratenic hosts before getting to definitive host
What are nonembryonated eggs
Stage just before hatching
Does toxascaris leonine migrate throughout the definitive host
No, only stays in the intestinal tract
Can eggs be seen
No, eggs are microscopic in feces
