Quiz 6 Flashcards
Features of Trichuris eggs
- Yellow, brown
- Football shape
- Bipolar plugs
- Resistant to environment
Infective stage of Trichuris
L1 - ingested by DH in egg
Outer egg then digested by DH and LI invades cecal/LI mucosa
Which trichurs spp affects dogs and foxes? C/S?
Trichuris vulpis
- Anemia (blood feeder)
- Low burden –> little effect
- Severe infection –> hemorrhage, weight loss, anorexia etc
Symptoms of T. vulpis may mimic which disease
Addisons dz (abnormal Na and K values)
Which Trichuris spp is zoonotic
T. vulpis
What causes catarrhal enteritis in pigs
Trichuris suis
C/S
- Diarrhea
- Dehydration
- Anorexia
- Retarded growth
Which Trichuris spp infects ruminants?
T. discolor
C/S only occasionally
Which Trichuris spp affect cats? C/S?
T. serrata and T. campanula
C/S rare
Give 2 ways to diagnose Trichuris
- Fecal float –> characteristic shape eggs
- Fecal ELISA of antigens from adult worms
Control of Trichuris
Eggs very resistant!
- Remove host
- Treat soil
- Replant grass
Which worms are barrel shaped?
Capillaria
What causes bronchial capillariasis? How does it present?
Capillaria aerophila
Presents like a bronchial carcinoma
Describe capillaria eggs
- bipolar
- green tinge
- striated shell (not smooth)
Which spp are affected by Capillaria aerophila? Where does it inhabit
Dogs, cats, fox, coyote
Inhabits trachea, bronchi, nasal cavity, frontal sinus
Infective stage Capillaria aerophila
L1 in feces or earth worm
Ingested, migrates intestines –> lungs, lays eggs –> coughed up, swallow –> feces –> LI
Faculative host C. aerophila
Earth worm (L1)
Which spp is C. aerophila most pathogenic in
Foxes
Chronic, serious - cough, weak, poor growth, death due to bronchopneumonia
Dogs/Cats - just cough, generally no c/s
Dx C. aerophila
Fecal float! (distinguish from Trichuris)
Where can you find C. aerophilla eggs (3)
Sputum
Feces
Nasal discharge
What causes urinary capillariasis in dogs
Capillaria plica
What causes urinary capillariasis in cats?
Capillaria feliscati
Which two parasites belong to Pearsonema? Where do they live? Dx?
Capillaria feliscati and C. plica
Bladder, renal pelvis
Dx: urine sample (eggs- asymmetrical, yellow to colorless with bipolar plugs)
T/F L1 Pearsonema will not hatch from egg unless ingested by an earthworm
True
DH then eats worm containing L1
A fox at a rescue center is straining to urinate. What do you suspect?
Capillaria plica
What causes nasal capillariasis? In which spp?
Capillaria boehmi
Dogs, foxes
Where do you collect sample to test for C. boehmi?
Feces, nasal secretions
Which worm in this quiz produces live offspring
Trichinella spiralis
T/F Capillaria aerophila is zoonotic
True
Humans can be infected with what by eating uncooked pork?
Trichinella spiralis
zoonotic, reportable
Host of Trichinella spiralis
Pigs, humans, rats, other mammals (bears, cougar)
Where do Trichinella spiralis live
Skeletal muscle
T/F - both adults and larvae of Trichinella spiralis can be found in same host
True - because reproduction occurs in host
You consume some raw bacon and a few days later have trouble breathing. Should you be worried?
Yes - youve consumed Trichenella spiralis which is fatal in humans (paralysis of respiratory muscles)
Dx Trichinella spiralis
Serology tests only! (ELISA in humans)
- Cannot detect eggs (none)
- No lifecycle in environment
Which species is also known as giant kidney worm. DH?
Dioctophyma renale
DH = mink
But not host specific- infects domestic animals
T/F Dioctophyma renale is zoonotic
True
Which kidney is usually affected by Dioctophyma renale
Right kidney
Features of Dioctophyma renale
Adult:
- Large red worm (largest nematode - females > males)
Eggs
- Thick pitted shell
- Barrel shape
- Yellow/brown
- Bipolar plugs
Dx Dioctophyma renale
Urine sample for eggs
IH of Dioctophyma renale. PH?
Earthworms (develops to L3 and ingested by PH or DH)
PH = frogs, crayfish, fish
How would you treat a mink for Dioctophyma renale
Nephrectomy
Which parasite causes intense anal pruritis and rat tail in horses
Oxyuris equi (the eggs cause these signs)
T/F pinworms are species specific
True
Where do you find adult Oxyuris equi
SI or LI of horse
Adults = non-pathogenic
Dx Oxyuris equi
Eggs around anus (scotch tape test)
Fecal floats dont work because no eggs in feces!
Where do Strongyloides adults live
Females: SI of host (parasitic)
Males: free-living in environment (non-parasitic)
Type of offspring of Strongylids (eggs/free living?)
Ovoviparous
Heterogonic larvae = offspring of free-living
Homogonic larvae = offspring of parasitic female
Which Strongyloides spp is zoonotic? What does it cause?
S. stercoralis (canid strongyle)
Causes larvae currens: pruritic skin lesions, autoinfection in immuncompromised, diarrhea, death
T/F - strongyloide females can produce eggs wihtout male
True - only females parasitic so dont need male to fertilize to produce offspring
Oral infection of Strongyloides is most common in which spp
Cat
Vertical transmission (transcolostral/transmammary) of Strongyloides is most common in which spp
Dogs
Horse
Pig
Ruminants
T/F Strongyloides can cause infection by skin penetration
True but not common
C/s Strongyloides stercoralis in dogs
Asymptomatic
Bronchopneumonia
Diarrhea
Weight loss, anorexia, death
Which worm causes larva currens and urticaria (hives) in humans
Strongyloides stercoralis
Which species do you use Baermann technique for dx
Strongyloides
Detects rhabditiform v filariform
How is esophageal structure of strongyloides useful in diagnoses?
Parasitic females (L3, adult) = filariform
Non-parasitic males and females in environment = rhabditiform
L1 and L2 stages = rhabditiform
What causes dog eyeworm
Thelaia californiensis
IH of Thelazia californiensis
Muscoid latrine flies
Fruit flies
What causes horse eyeworm
Thelazia lacrymalis
Which eyeworm species is zoonotic
Thelazia californiensis (dog eyeworm)
Where does Thelazia lacrymalis live
Conjunctival sac and lacrimal ducts of horse
reported in cows, dogs
Dx eyeworms
L1 in lacrimal secretions
(observing parasites in eye)
What is the horse stomach worm
Habronema
Eggs of Habronema
Long, thin shelled, ovoviviparous
Hotdog shape
IH of Habronema
L1 in fly maggots:
House fly
Stable fly
A horse is infected with Habronema. What is the most likely way it was infected?
L3 escaped fly mouth parts when feeding around mouth, lip or wound of horse
Different developments of Habronema in host
Cutaneous: larvae in wounds
Ocular: larvae in eye
Pulmonary: bloodstream –> eye
Which species causes summer sores in horses? What is the main c/s
Cutaneous Habronema
C/S - ‘proud flesh’ (granulation tissue)
Which worm species ares nodules in stomach wall of equids
Draschia
How is Draschia transmitted
Same as Habronema (fly mouth parts –> pulmonary, ocular, cutaneous)
Dx Draschia
- Embryonated larvae in fecal float or gastric lavage
- Biospy of lesions around eye and skin
Tx of equine stomach worms
Fly control
Anthelmintics
Draschia more difficult to treat due to nodules
Dog/cat stomach worm. Where is it found
Physaloptera
Found in stomach/duodenum
Eggs of Physaloptera
Thick walled, ovoviviparous
IH and PH of Physaloptera
IH: cockroach, grasshopper, cricket, beetle
PH: frog, snake, rodent, lizard
Infective stage of Physaloptera
L3 (in IH)
C/S Physaloptera
Stomach wounds from mucosal attachment –> melana, vomiting, diarrhea, weight loss
Dx Physaloptera
Eggs in vomit/feces
Gastropscopy: pseudogranulomas
CBC/Chem: anemia, eosinophilia
Which species is found in the wall of esophagus, stomach and aorta of dogs and wild felids/canids?
Spirocera lupi
IH Spirocera lupi? PH?
Dung beetle
PH = amphibian, reptile, bird, hedehog, rodent, rabbit
Which parasite can develop into malignant tumors, including osteosarcoma and fibrosarcoma?
Spiroceta lupi
Which parasite causes hypertrophic pulmonary osteoarthropathy (HPO) in long bones?
Spirocera lupi
Dx Spirocera lupi
- Sedimentation technique (eggs in feces, vomit)
- Radiography
- Endoscopy
- FLOTAC: flotation and PCR
Which skin worm affects racoons, dogs, cats
Dracunculu insignis
Which skin worm infects humans
Dracunculus medinenesis
IH and PH Dracunculus
IH: water fleas, copepods
PH: tadpoles, fish
How are Dracunculus eggs released?
- Female anus and vulva atrophies
- Ulcer develops in host skin - female projects body and prolapses urterus - discharging larvae
Is Dracunculus only found in skin?
No, fertilized females migrate to skin but L3 migrates to other tissues (can calcify)
Tx Dracunculus
- Surgical excision
- Wetting ulcer to lure out, turning stick each day