Lecture 24: Roundworm disease I Flashcards
What is the epidermis of nematodes covered by
Cuticle
Nematodes have a ___ with a separate mouth and anus
Complete digestive tract
What is the normal life cycle of nematodes
- 4 juvenile stages (L1-L4)
- L1-3 occur in intermediate host
- L3-L4 in definitive host
What is the infective stage for nematodes
L3
What does monoxenous mean
Acquired via ingestion of infective eggs or larvae
What does heteroxenous mean
Ingestion of infected intermediate or paratenic host
What species does A. Suum infect and where
Swine and SI- cause liver and lung damage
What species does Parascaris equorum infect
Horses
What life cycle do ascaridids have
Direct life cycle
How are ascaridids spread
Fecal oral transmission
Ascaridids undergo what type of migration in DH
Hepato-tracheal migration
Describe hepato-tracheal migration
liver—> lungs—> respiratory tree—> pharynx—> SI
What symptoms are present in young pigs with A. Suum infection
Respiratory signs (can be fatal), diarrhea, weight loss
What symptoms are present in foals with P. Equorum
Respiratory signs, weight loss, constipation, colic, diarrhea
Can be fatal
What diagnostic tool can be used to dx A. Suum or P. Equorum
Baermann apparatus
Following image is of pig lungs and liver. What parasite caused this
A. Suum
What species does T. Canis infect
Dogs
T. Canis is common in what dogs (age)
Puppies
How does T. Canis spread to puppies
Transplacental (usual mode), transmammary
What species does T. Cati infect
Cats
What age group is T. Cati common in
Kittens
How do kittens get T. Cati
ingestion of infective eggs
Can be transmammary if queen is infected late in pregnancy
T. Cati can only spread to kittens transmammary under what circumstances
Queen is infected late in pregnancy
What species does T. Leonina infect
Dogs and cats
Where is body do toxocara species infect
SI
How does dog or cat become infected with T. Leonina
Ingestive of infected eggs or paratenic hosts (rodents)
What symptoms are seen in dog with T. Canis
Respiratory signs, poor growth, distended abdomen, vomiting diarrhea, pale MM, intestinal hemorrhage, peritonitis
Can T. Canis be fatal
Yes in puppies
What signs are seen in kittens with T. Cati
Distended abdomen, diarrhea, ill thrift
What signs are seen in adult cats with T. Cati
Enteritis with vomiting
Adult cat presented with vomiting, these worms were found in vomit. What parasite is this
T. Cati
What zoonotic risk does toxocara species pose
Visceral larva migrans, ocular larva migrans, neurological larva migrans
Puppy presented with respiratory signs, diarrhea, distended abdomen, vomiting. The following egg was found in fecal sample. What parasite is this
T. Canis
What species does Ascaridia Gali infect and where
SI of Chickens, turkey, geese and wild birds
What is the most common roundworm of domestic poultry
A. Galli
Where are larvae of A. Galli located
Mucosa of SI
Where are adults of A. Galli located
Lumen
Chicken presents with decreased appetite, poor growth, drooping wings, pale combs and wattles, anemia, and diarrhea. The following fecal sample was obtained what is the parasite
A. Galli
What is the tx for A. Galli
Fenbendazole
What species does Heterakis gallinarum infect and where
Cecum of chickens, turkeys and other Galliform birds
What is heterakis gallinarum the vector for
Histomonas meleagridis
What species does oxyuris equi parasitize and where
Descending small colon, large colon and cecum of equids
Where are oxyuris equid eggs typically found
Perianal skin
Where are larvae of O. Equi located
Mucosal crypts of colon and cecum
Where are adults of O. Equi located
Lumen of cecum and colon
How can you Id O. Equi
Cellophane tape test or Perianal region
What is used to tx O. Equi
Benzimidazoles
Horse presents with Perianal itching, anorexia, restlessness, and nervousness. You perform cellophane tape test and find these eggs. What parasite is this
O. Equi
