Parasit Final TS Flashcards by Tricia Spooner

Where does Musca Autumnalis lay their eggs?

fresh cattle dung

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What pathogen can musca autumnalis transmit?

Moraxella bovis - kertaoconjuctivitis

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What is the worm that uses Musca autumnalis as an intermediate host?

Thelazia (eye worm)

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What 2 types of flies have bayonet like mouth parts?

Stomoxys (stable fly) and Haematobia (horn fly)

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Where do stomoxys flies lay their eggs?

decaying vegetable matter

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What are stomoxys flies an intermediate host for?

Habronema (stomach worm in horses)

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What lesions do stomoxys cause on animals?

puncture wound that bleeds freely, both female and males suck blood

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What are the hosts of haematobia?

mostly cattle, sometimes horses

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Where do haematobia flies feed?

top line, withers, base of horns

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Where do haematobia flies lay their eggs?

fresh dung

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What is the importance of the haematobia fly?

millions in economic losses to cattle production through irritation and annoyance

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What uses haematobia fly as an intermediate host?

Stephanofilaria stillesi (filarial parasite of cattle skin)

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What are the 2 other names for Melophagus ovinus?

sheep keds, hippoboscid fly

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What kind of fly is Melophagus ovinus?

hippoboscid fly - wingless dipteran

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What is the life cycle of Melophagus ovinus?

modified complex metamorphosis - entire life cycle on sheep, gives birth to larvae

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What is the importance of Melophagus ovinus?

damaged wool - stained with ked feces

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What is the host of most louse flies?

wild birds - raptors, songbirds, pigeons

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What are characteristics of louse flies?

long wings, flattened, dark brown

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What is the life cycle of louse flies?

similar to melophagus, modified complex metamorphosis

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What is the common name for Cochlomyia hominivorax?

The primary (american) screwworm

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What are the hosts of the primary screwworm?

any warm blooded mammal, including humans

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What are the characteristics of the primary screwworm?

distinct band of spines, two breathing tubes are deeply pigmented

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What is the life cycle for the primary screwworm?

breed only once during life time, lay eggs in clean/fresh wounds

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What is the importance of the primary screwworm?

must be reported to USDA or state vet

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What is being done to control primary screwworm?

sterile male release technique

What is the common name for Hypoderma sp?

cattle grubs, ox warbles

What are the characteristics of Hypoderma spp?

adults have no functioning mouth parts

What do Hypoderma sp. cause in cattle?

terror, cause lesions

What cautions should be taken when treating Hypoderma sp?

rupture of larvae leads to abscess | do not treat in late fall when they are in submucosa of esophagus

When is the best time to treat Hypoderma spp?

summer or early autumn

What is the common name of Oestrus spp?

nasal botfly of sheep

What is the life cycle of Oestrus spp?

complex modified

What is false gid?

larvae of oestrus penetrate cribiform plate and migrate to brain

What is the pre patent period of the horse botfly in the stomach?

10-12 months

What is the scientific name of horse botfly?

Gasterophilus spp

What are the common names for cuterebra sp?

wolves, warbles

What are the preferred hosts of cuterebra?

rabbits, mice, squirrels, chipmunks

What are the accidental hosts of cuterebra?

cats, dogs, humans

How do cuterebra get inside host?

penetrate natural body opening and migrate in subQ tissues, produce large cysts

What can cuterebra spp cause in dogs and cats?

fatal cerebral myiasis, feline ischemic encephalopathy

What flea carries the plague?

Xenopsylla cheopis

What is the scientific name for human body louse?

Pediculus humanus

What are the fleas found on birds?

Echidnophaga gallinacea

What kind of drugs can you use against lice?

same as fleas

What is a chewing lice that infects dogs and transmits diplydium caninum?

Trichodectes canis

What is the chewing louse of cats? What does it look like?

Felicola spp., large trangular head

What species does Damalinia (bovicola) cheweing lice infect?

cattle, horses, sheep, goats

What is the genus of bed bugs?

Cimex

What is the common name of pentastomes?

tongue worms

What does the mouth of a pentastome look like?

surrounded by four hooked claws

What is the definitive host for pentastomes?

reptiles

What is the canine pentastome?

Linguatula serrata

What are the clinical signs of canine pentastome (Linguatala serrata)?

difficulty breathing

What are two ticks that can cause tick paralysis?

dermacentor and amblyomma

What do hard ticks have that make them hard?

scutum

What hard tick transmits berrelia burgdorferi (lyme disease)

Ixodes scapularis

What characterizes Ixodes ticks?

anal groove is distinct

What ways is lyme disease spread through ixodes ticks?

interstadial transmission, a larval tick carries it and transmits after it molts

Which hard tick has the most virulent tick paralysis?

Ixodes holocyclus - in austrailia

What is the wild host of babesia?

white tailed deer

What is important about the spread of babesia among ticks?

Transovarian transmission: incorporated into ovary - nymph and adult progeny can transmit

Where is babesia reportable in bovines?

US and europe

What can babesia cause in equine?

abortion

What are the characteristics of the dermacentor tick?

festoons, ornate, dark brown with white color on scutum

What can dermacentor ticks transmit that is uniformaly fatal diz in cats? What is the ddx?

Cytauzoon felis - death occurs in 24 hours | dog: hepatazoon?

What are the 2 species of dermacentor ticks that can transmit cytauzoon felis?

D. andersoni an D. variabilis

What tick is very prevelent in grenada? what does it look like?

Rhipicephalus

What can rhipicephalus ticks transmit?

ehrlichia (others - hepatozoon, piroplasmosis)

What tick can transmit hepatozoon americanum?

Amblyomma

What may amblyomma ticks do in humans?

cause meat allergy

How can dogs get H. canis?

ingesting rhipicephalus sanguineus tick containing sporulated oocysts

How can dogs get H. americanum?

ingesting Amblyomma tick containing sporulated oocysts

What are the clinical signs of H. americanum?

periosteal proliferation (fever, neutrophilic leukocytosis, myalgia, weakness)

What is the treatment for H. americanum?

no treatment!

What 2 soft ticks do we need to know?

Argas - the fowl tick | Otobius megnini - spinose ear tick

What can the argus tick larvae cause in young chickens?

tick paralysis, fatal flaccid paralysis

What tick life cycles are found attached to the ears in otobius megnini?

larval and nymphal

What are the CS of otobius megnini in horses?

muscle crampin, colic-like, sweating, muscle tremors, muscle fasciculations

What is the common name of ophionyssus natricis? What are the CS?

snake mite | difficulty shedding skin

What technique is used to diagnose mesostigmatid mites?

berlese technique

What is the mesostigmatid mite that causes sneezzing and rhinitis in dogs?

Pneumonyssoides

What species is sarcoptes spp reportable in?

all LA except swine

What are the characteristics of sarcoptes mites?

long, unsegmented pedicles

What mite causes pruritis so intense that guinea pigs are subject to fits and seizures?

Trixacurus caviae (also seen in chewing lice)

What mite causes scaly leg in chickens and turkeys?

Knemidokoptes mutans

What are the characteristics of psroptes mites?

long, three segmented pedicels

What mite is reportable in ALL large animal species? What disease does it cause?

psorptes ovis | scab mange - doesnt burrow

What mite is found in rabbits and causes otitis externa?

Psoroptes cuniculi

What is the superficial dwelling mite in cattle, sheep, horses, and hedgehogs?

Chorioptes bovis

What are the characteristics of chorioptes bovis mite?

short, unsegmened pedicel

What does chorioptes cause in horses?

dermatitis of the legs, near the mane and tail

What does chorioptes cause in hedgehogs?

pruritis and loss of quills

Where is otodectes mites found in dogs, cats, and ferrets?

external ear canal an adjacent skin

What are the characteristics of otodectes mite?

short, unsegmented pedicels

Where do demodex mites live?

hair follicles and sebaceous glands of mammals (and humans) but not zoonotic - species specific

If a puppy comes in with localized hair loss and cigar shaped mite, what is it?

demodex

Where do puppies get demodex mites?

from moms during nursing

What are the clincal signs of persistant demodex?

generalized hair loss and scaling

What can predispose dogs to demodex?

T-cell autosomal recessive gene

What are the CS of demodex in cattle?

egg sized nodules on neck and forequarters

What are the defining characteristics of cheyletiella?

big palpabal claws

What are the CS of cheyletiella mites?

walking dandruff - bran like exfoliativee dermatitis

What species are the mite larvae parasitic and is zoonotic?

chiggers (mite)

Parasit Final TS Flashcards

(103 cards)