Parasitology Exam 3 Flashcards by AE G

Ascaris suum
morphology
host
location
infectious stage
PH
clinical signs

3 lips anterior end, males posterior curved end
domestic/wild pigs
GI tract, liver, lungs
L3
parantenic host (beetles/earthworms)
“milk spots in liver”, “thumps

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“Trichinosis” Trichinella spiralis
host
location
infectious stage
clinical signs

humans, domestic/feral swine
eye, tongue, masticatory muscles, diaphragm, arm, leg mm
ingestion of meat w/ encysted larvae (L1)
nurse cell formation

petechial hemorrhage under nails in humans

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which parasite larvae encyst in striated muscle to form nurse cells?

Trichinella spiralis, larvae/adults utilize same host, never see outside environment

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Metastrongylus sp.
host
location
infectious stage
clinical signs

“pig lungworm”
4-7mo old pigs
lungs
ingestion of L3 in IH (earthworms)
bronchitis/lung infection

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what stage of Metastongylus sp. is passed in the feces

larvated eggs

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Nematodirus battus, filicollis, spathiger
morphology
host
location
infectious stage
clinical signs

males have bursa
sheep
proximal SI
ingestion of L3
enteritis/diarrhea/death in 2 days

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Nematodirus helvetianus
morphology
host
location
infectious stage
clinical signs

males have bursa
cattle
proximal SI
ingestion of L3
enteritis/diarrhea/death in 2 days

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Gongylonema pulchrum
morphology
host
location
infectious stage
clinical signs

“gullet worm”
white, longitudinal rows of cuticular bosses
ruminants, pigs, horses
esophagus, rumen
ingestion of IH w/ L3
esophageal inflammation

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Parelaphostrongylus tenuis
morphology
host
location
infectious stage
clinical signs

“meningeal worm or brainworm”
L1 have dorsal spine
white-tail deer, moose
veins, venous sinuses of cranial meninges, CNS
ingestion of IH (slugs, snails)
neuro dz, moose sickness

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Dictyocaulus viviparous
morphology
host
location
infectious stage

males have bursa
cattle
“lung worm”
ingestion of L3

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Dictyocaulus filaria
morphology
host
location
infectious stage

males of bursa
sheep, goats, camel
“lungworm”
ingestion of L3

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Dictyocaulus arnfieldi
morphology
host
location
infectious stage
clinical signs

males have bursa
donkeys, rare in horses
“lungworm”
ingestion of L3
donkeys asymptomatic, horses eosinophilic pneumonia

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which nematode produces white/red blood-filled zig zag tracts?

Gongylonema pulchrum “gullet worm”

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what nematode causes human respiratory, GI, malnutrition, impaired cognition, eosinophilic infiltration of tissue and death?

Ascaris suum

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what nematode results in petechial hemorrhage in conjunctiva and under the nails in humans?

Trichinella spiralis “trichinosis”

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Ascaridia galli (chickens) & A. columbe (poultry)
host
location
infectious stage

galliform birds
small intestine
ingestion of L3 larvated eggs or paratenic host (earthworm)

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what nematode is the largest nematode in poultry?

A. galli & A. columbe

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what stage is passed in A. galli and A. columbe

unembryonated eggs are passed into the environment

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Heterakis gallinarum
host
location
infectious stage
PH
vector for

“cecal worm”
galliform birds/anseriform birds
esophagus & crop
L3
paratenic host (earthworm)
vector for Histomonas meleagridis

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what stage of Heterakis gallinarum are passed into the environment?

unembryonated eggs passed into environment

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Capillaria annulata/Eucoleus annulata
morphology
host
location
IH

“hairworms or threadworms”
eggs are similar to Trichuris bipolar plugs
chickens, turkeys, ducks, wild birds
esophagus/crop
earthworm

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Baylisascaris procyonis
host
location
infectious stage
clinical signs
PH

racoons, dog shedders
GI of DH
L3
visceral larval migrans and ocular larval migrans in humans
PH: rodents, rabbits, birds

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what stage of Baylisascaris procyonis is passed in the envrionment

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unembryonated egg

infectious stage of B. procynosis

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L2 or L3

Syngamus trachea morphology host location infectious stage clinical signs

"tracheal worm" Y shaped, male/female conjoined poultry (host), wild birds (reservoir) trachea ingestion of embryonated eggs or juveniles gasping, gaping appearance

Dicrocoelium dendriticum host location infectious stage

digean trematode - "small lanceolate fluke" cattle, sheep, goats, lagomorphs liver metacercariae in 2nd IH (ants) on vegetation

what is the infectious stage of D. dendriticum and Fasicola

metacercariae

Fascicola jacksoni & F. hepatica host location infectious stage

F. jacksoni - elephants F. hepatica - ruminants liver/biliary ducts metacercariae on vegetation

difference between D. dendriticum and Fasicola life cycle

D. dendriticum embryonated eggs are passed in feces 1 IH = snails 2 IH = brown ants "formica" metacercariae in 2 IH on vegetation Fasicola unembryonated eggs are passed in feces 1 IH = snails metacercariae on vegetation

Echinococcus granulosus & multiloculari morphology host(s) location

tapeworm - short/small, few proglottids in length, proscolex on anterior end E. granulosus = carnivores, ungulates IH E. multiloculari = carnivores, wild canids GI tract

difference in E. granulosus and E. multiloculari life cycle and infectious stage

E. granulosus = unilocular cyst E. multiloculari = multilocular cyst

what type of cyst to E. granulosa have

hydatid cyst

what disease does E. granulosus cause

Cystic Echinococcosis (CE) "hydatid disease or hydatidosis"

what disease does E. multilocular cause

Alveolar Echinococcosis (AE)

Diphyllobothrium latum morphology host location

tapeworm two longitudinal bothria, L/M genital pores, vitellaria scattered, numerous testes, uterine pore marine mammals/piscivorous animals GI of DH

Describe D. latum lifecycle 1 IH? 2 IH? paratenic host?

- unembryonated eggs passed in feces and develop in water - coracidia hatch, ingested by 1 IH (crustacean/copebod) - procercoid develops in IH - 1 IH ingested by 2 IH (small fish) - paratenic host (fish) ingests 2 IH - DH ingests plerocercoids from PH

Eimeria macusaniensis host location infectious stage

coccidia camelids GI ingestion of sporulated oocyst

what stage of Eimeria is passed into the environment

unsporulated oocyst "sporongy" occurs in the environment

what parasite is a disease of hunsbandy/management, presence/absence not associated with disease, is more common in young/stressed animals and severity based on number of oocysts ingested?

Eimeria spp. coccidia

Eimeria tenella host location infectious stage

poultry, gamebirds GI tract ingestion of sporulated oocysts from contaminated feed/water

what stage do coccidiostats in feed/water target to prevent outbreaks of EImeria? what do vx contain?

the schizont stage vx have oocysts

Histomonas meleagridis apicomplexan or non-apicomplexan host reservoir vector paratenic host

NON-APICOMPLEXAN (no cyst) host - gallinaceous fowl, chickens, turkeys, peafowl, pheasants reservoir: chickens vector: heterakis gallinarum earthworm

what are the clinical signs of Histomonas meleagridis

blackhead in turkeys pinpoint ulcers in cecum cecum filled with cheesy, fowl smelling plugs white/green areas of necrosis yellow diarrhea

what bacteria is H. meleagridis associated with

E.coli & C. perfringens

Haematopinus suis morphology host location vector for?

"sucking hog louse" skin - folds of neck, jowl, flanks, legs african swine fever, eperythrozoon suis, swine pox

largest blood sucking louse in domestic animals is

Haematopinus suis "hog louse"

Menopon gallinae morphology host location

poultry shaft louse - chewing louse poultry/gamebirds integument

Sarcoptes scabei suis morphology host location what does each tunnel contain

mite - unjointed pedicles, burrowing, claw-like structure swine edges of ears, eyes, snout --> pruritis female + her eggs + her feces

Demodex phylloides morphology host location transmission lesions

follicular mite - elongated swine hair follicles, sebaceous glands, eyelids suckling, hard to transmit due to deep hair follicles ventral abdomen, neck, eyelids, snout

Knemidocoptes spp. host location/lesion

sarcoptiform mite poultry, gamebirds integument - scaly leg and scaly face; mange on beak/face

Dermanyssus gallinae morphology host location life stages

"red poultry mite or chicken mite" anal plate chickens, turkeys, pigeons, canaries, wild birds integument egg, larvae, protonymph, deutonymph, adult

Ornithonyssus sp. host location

"northern fowl mite" poultry, gamebirds parting feather in the vent region

most important parasite of layers and breeding chickens?

Ornithonyssus sp. "northern fowl mite"

Echidnophaga gallinacea morphology host location

"poultry sticktight flea" no comb, poultry, gamebirds eyes/face

Cuterebra spp. morphology host location life cycle

"bot fly" pink, fleshy young, black spines adult dogs, cats, rabbits integument larvae migrate to SQ form "warble", can drop into environment

obligatory parasites

Cuterebra spp. "bot fly" Ornithonyssus spp. "northern fowl mite" Gasterophilus intestinalis "equine stomach bot"

obligate intracellular parasites

Cystoisospora Sarcocystis Hepatozoon americanum Toxoplasma gondii Neospora caninum

Parasitology Exam 3 Flashcards

(57 cards)