AHS 302L week 3

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  1. Two types of mites
    • Sarcoptiform
    • Nonsaroptiform
  2. Two types of ticks
    • Argasid (Soft)
    • Ixodid (Hard)
  3. Four developmental stages of mites and ticks
    • egg
    • larva - six legged
    • nymph - eight-legged
    • adult - eight-legged
  4. Acariasis
    infestation with mites or ticks
  5. Sarcoptidae
    • A family or mites
    • Mites that burrow or tunnel within the epidermis, causing pruitus
    • spread by direct contact
    • disease called SCABIES
  6. Psoroptidae
    • a family of mites
    • mites that reside ont he surface of the skin or ear canals
  7. Genera in Sarcoptidae
    • Sarcoptes
    • Notoedres
    • Cnemidocoptes
    • Trixacarus
  8. Physical description of Sarcoptidae
    • very tiny
    • round in shape
    • legs have "stalks" (pedicels) with long suckers
    • legs can be short or long, straight or jointed
    • Sarcoptes scabei variety canis
    • Canine scabies mite
    • long, unjointed pedicel
    • suckers on some of the pedicels
    • terminal anal opening
    • zoonotic potential
    • presents as "crusts" on body
    • zoonotic
    • Notoedres cati
    • Felin scabies mite
    • smaller than Sarcoptes spps.
    • dorsal subterminal anal opening
    • host specific, can be seen on rabbits
    • zoonotic
    • Demodex sp.
    • commensal
    • burrowing - lives in hair follicles
    • host specific
  9. Demodex canis pathogenesis
    • normal commensal causes disease when predisposition present.  
    • usually kept in check by healthy body but causes secondary problems.
    • may be generalized or local 
    • alopecia with no or mild puritis.
  10. Family Psoroptidae
    • live on surface of skin
    • long, jointed pedicels
    • (P)Soroptes have Segments
    • multiple species - Psoroptes ovis, bovis, equi, cuniculi
    • Large animal Psoroptes sp. REPORTABLE to USDA except P. cuniculi
  11. Psoroptes spp. lifecycle
    • confined to skin surface
    • eat by siphoning serous exudate
    • adutls lay over 100 eggs
    • life cycle complete in 10 days
    • live for 1 month
    • Psoroptes cuniculi
    • ear canker mite of ribbits
    • may also infest goats, horse -- less severe
    • direct contact
    • long jointed pedicels with suckers
    • mites live in ceruminous discharge
    • "corn flake" appearance of ears
    • Chorioptic Mange
    • less pathogenic, usually subclinical
    • superficial, mildly puritic, flaky dermatitis around tail and hind legs
    • usually self limiting in mobile cattle
    • causes "scalding" of legs and scrotum on rams and sheep
    • Psoroptidae
    • Otodectes cynotis
    • ear ites, short, unjointed pedicels with suckers
    • external ear canal of dogs, cats and ferrets
  12. 3 Genus within Family Psoroptidae
    • Psoroptes
    • Chorioptes
    • Otodectes
    • Family Psoroptidae
    • Otodectes cynotis
    • can cause otitis externa
    • extremely puritic
    • spread by direct contact, extremely contagious
    • classic "coffee ground" apperance of otic debris
    • Family Cheyletiellidae
    • Cheyletiella parasitivorax
    • Walking dandruff
    • live on the skin surface of cats, rabbits, dogs
    • hook-like mouthparts and comb structures on legs
    • bell pepper shaped body, doesn't burrow
    • Family Cheyletiellidae
    • Cheyletiella parasitivorax
    • diagnosed by visualizing moving dandruff along dorsal midline
    • find with flea comb or clear cellophane tape
    • Chorioptes spp
    • surface mites of ruminants and horses
    • most strains = C. bovis
    • look very similar to Psoroptes
    • short, unjointed pedicels with suckers
  13. How to differentiate mites
    • Sacroptes and Notoedres - long, unsegmetned pedicels
    • Psoroptes - long, segmented pedicels
    • Otodectes - short, unsegmented pedicels
  14. Family Ixodidae
    Hard ticks
  15. Questing
    crawl to the tips of plants with front legs extended in order to reach a potential host
    • Ixodes scapularis
    • Deer Tick
    • adults on horses, dogs, deer and humans
    • eastern united states
    • Vector for: tularemia, Babesia sp., Borrelia burgdorferi (Lyme disease)
    • tick paralysis
    • Ixodes pacificus
    • Western black-legged tick
    • only tick in california that transmits Lyme disease
    • more common in the humid northwestern coastal area and western slope of the northern Sierra Nevada mountains
    • Amblyomma americanum
    • Lone star tick
    • 3 host tick
    • wide rangs of mammal hosts, humans
    • longer mouthparts
    • warmer climates - south, midwest, east coast of US
    • Vector for tularemia, RMSF and can cause tick paralysis
    • White spot on scutum
    • Ambylomma maculatum
    • Gulf Coast Tick
    • 3 host tick
    • adults on cattle, sheep, dogs, humans
    • east coast and gulf coast of US
    • tick paralysis
    • Ornate scutum - silvery markings
    • Rhipicephalus sanguinous
    • Brown dog tick
    • dogs, sometimes humans
    • throughout NA
    • Vector for Babesia canis, Anaplasma sp., Ehrlichia sp., Borrelia sp., Mycoplasma sp., and tick paralysis in humans
    • Lateral projections on side of head
    • Rhipicephalus annulatus
    • Texas Cattle Fever or North American Tick
    • formerly Boophilus annulatus
    • 1 host- cattle
    • Eradicated in US
    • Vector for Babesia bigemina -- bovine piroplasmosis
    • 40-100mil spent on keeping tick at bay
    • Dermacentor variabilis
    • American Dog Tick or Wood Tick
    • 3 hosts
    • small mammals, dogs, humans
    • throughout the US
    • vector for RMSF, tularemia, causes tick paralysis
    • ornate scutum
    • Dermacentor andersoni
    • Rocky Mountain Wood Tick
    • adults on dogs, horses, cattle, goats, sheep and humans
    • rocky mountains manly
    • Vector for Rocky mountain spotted fever, tularemia, colorado tick fever, Q-fever and tick paralysis
  16. Soft ticks
    • Argas spp.
    • mostly attacks birds, but will attack humans
    • no scutum
    • mouthparts not seen from above
    • Argas persicus
    • foul or poultry tick
    • production losses
    • flaccid paralysis of young chickens
    • all life stages can be collected from bird or its envrionment
    • Otobius megnini
    • Spinose ear tick
    • only larval and nymph stages are parasitic
    • adult stages are free living
    • larvae and nymphs can feed on horses, cattle, sheep, goats, dogs
    • Southwestern USA
    • occur in large numbers, invade the external ear canal
    • cause pruitus, ulceration of ears
    • visualized with otoscope

Card Set Information

AHS 302L week 3
2014-01-30 05:08:56
parasitology wallace

AHS 302L Lab 3 Review of MItes and Ticks W14
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