17. mites Flashcards by jillian Bastidas

— are microscopic ectoparsites

mites

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what do mites feed on

blood, skin debris, lymph and sebaceous secretions

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how are mites transmitted

direct prolonged contact

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what are some symptoms of mites

dermatitis- mange
loss of blood and tissue
allergic reaction
vectors or intermediate hosts ( Anoplocephala, Monezia, Stilesia)

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how do mites breathe

gas exchange by integument or stigmata

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life cycle of a mite

3 nymph stages
all stages are on the host

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4 types of burrowing mites

Sarcoptes
Notoedres
Knemidocoptes
Demodex

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demodex

cigar shaped body
8 stumpy legs
striations on the abdomen

burrowing mite

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Demodex folliculorum infect

humans

burrowing mite

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Demodex phylloides infect

pigs

burrowing mites

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where do demodex live

hair follicles and sebaceous glands

head downward

burrowing mites

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symptoms of demodex

NOT itchy

localized:
paws and face with dry scales, mild alopecia and lesions

generalized:
dry/squamous- all over body thickened and crusty with marked alpopecia

wet/purulent/follicular- all over skin thickened, excoriated and red, marked alopecia, 2ndary bacterial infection- euthanasia

burrowing mite

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red mange is caused by

demodex

burrowing mites

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what does demodex look like

cigar shaped
8 legs
striation on the body

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2 types of generalized demodecosis

dry/squamous- all over body thickened and crusty with marked alpopecia

wet/purulent/follicular- all over skin thickened, excoriated and red, marked alopecia, 2ndary bacterial infection- euthanasia

demodex- burrowing mites

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Sarcoptes

burrowing mite (Sarcoptes, Notoedres, Knemidocoptes, Demodex)

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what causes scabies

Sarcoptes scabiei var.

burrowing mite (Sarcoptes, Notoedres, Knemidocoptes, Demodex)

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what does sarcoptes look like

short mouth
no eyes or stigmata
circular
stubby legs, 3th and 4th pair can’t be seen from the top
triangular scales in rows
1st two pair of pretarsi bears terminal suckers

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on sarcoptes 1st pair of pretarsi are

terminal suckers

burrowing mite (Sarcoptes, Notoedres, Knemidocoptes, Demodex)

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life cycle of Sarcoptes

14-21 days

females lay eggs in burrow(moulting pocket)- only one female per burrow

mating at surface

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symptoms of Sarcoptes

itchy
skin lesions around head and ears
spread during suckling or mating
redness, alopecia
skin thickening
secondary infections
anorexia, blindness, impaired hearing

burrowing mite (Sarcoptes, Notoedres, Knemidocoptes, Demodex)

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Notoedres infect

N. cati- cats
N cati var. cuniculi- rabbits

what does Notoedres look like

Like Sarcoptes except striations are thumb print

burrowing mite (Sarcoptes, Notoedres, Knemidocoptes, Demodex)

notoedres

burrowing mite (Sarcoptes, Notoedres, Knemidocoptes, Demodex)

life cycle of notoedres

similar to sarcoptes except there can be more than one female in the burrow burrow called a nest burrowing mite (Sarcoptes, Notoedres, Knemidocoptes, Demodex)

burrow for a Notodres is called --- burrow for a Sarcoptes is called ---

molting pocket- only one female nest- many females

symptoms of Notoedres

skin lesions and itchiness similar to sarcoptes burrowing mite (Sarcoptes, Notoedres, Knemidocoptes, Demodex)

what animals are infected by Knemidocoptes

birds burrowing mite (Sarcoptes, Notoedres, Knemidocoptes, Demodex)

symptoms of Knemidocoptes

K. mutans- scaly legs K. pilae- scaly face K. gallinarum- depluming itch burrowing mite (Sarcoptes, Notoedres, Knemidocoptes, Demodex)

what does Knemidocoptes look like

Sarcoptes except for no triangular scales

Psoroptes non burrowing mite

what does Psoroptes look like?

oval long legs pointed mouthparts 3 jointed pretarsi with funnel shaped pedicels

Psoroptes cuniculi infect

ear mites

Psoroptes infect

mammals P. ovis- sheep scab P. cuniculi- ear mites

clinical signs of Psoroptes infection

inflammation, exudation in ears, yellow crust and scab formation wool drop intense itching weight loss, restlessness and secondary infections non burrowing mites

Psoroptes ovis non burrowing mites

--- are ear mites with cup shaped pedicle

Otodectes cynotis

--- have cup shaped pedicels

Otodectes cynotis- ear mites non burrowing mites

Otodectes cynotis infect

cats, dogs and other small mammals usually ears but can spread

symptoms of Otodectes cynotis

asymptomatic or severe ear infection waxy exudate itchiness that leads to head shaking

--- are fur mites

Cheyletiella non-burrowing mites

cheyletiella infect

rabbits, small mammals and human non-burrowing mites

Cheyletiella fur mites rabbits and humans

Cheyletiella have ----

palp bear claws pedicels are comb like

Cheyletiella blackei commonly affects the face of

cats cause itchiness and skin shedding- walking dandruff

walking dandruff on cats is caused by

Cheyletiella blackei fur mite- non burrowing

sheep itch mite is caused by

psorergates ovis crude star look nonburrowing mite

Psorergates ovis looks like

star like- legs are evenly spaced sheep itch mite- non burrowing mites bite at fleece- lose patches

the red mite- poultry mite dermanyssus gallinae feeds on blood and becomes red or black when engorged spider-like, lair ectoparasite cause irritation, anemia, decreased egg production and death

Dermanyssus gallinae

the red mite dermanyssus gallinae feeds on blood and becomes red or black when engorged spider-like, lair ectoparasite cause irritation, anemia, decreased egg production and death

diagnosis of mange is by

skin scraping that shows mites

K. mutans-

scaly legs Knemidocoptes burrowing mite of birds

K. pilae-

scaly face Knemidocoptes burrowing mite of birds

K. gallinarum-

depluming itch Knemidocoptes burrowing mite of birds