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Jorge FCP > Diagnostic approach to common ectoparasites seen in practice > Flashcards

Diagnostic approach to common ectoparasites seen in practice Flashcards

1
Q

What is the best method to get a flea sample?

A

Coat brushing/comb +/- wet paper test – no need for microscopy

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2
Q

What is the best method to get a lice sample?

A

Coat brushing/comb, unstained acetate tape strip, trichograms (egg on hair).
Visible with naked eye, but microscopy needed to assess if chewing/sucking louse +/- to speciate

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3
Q

What is the best method to get a surface mite sample?

A

Coat brushings/combings or ear wax into liquid paraffin (LP) on slide; superficial skin scrape into LP; unstained acetate tape strip.
Trichogram (egg on hair) for Cheyletiella.
Microscopy generally required.

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4
Q

What are the best methods for getting a deeper mite sample?

A

microscopy always required
Deeper skin scrapings into LP:
Sarcoptes – scrape into epidermis
Demodex – deeper - scrape until blood oozes. Also adjunctive tests: hair pluck + ?acetate tape impression smears of squeezed skin

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5
Q

In what situations is serology used to identify parasites?

A

Psoroptes antibody serology - sheep scab
Sarcopted IgG serology - canine
Flea IgE serology

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6
Q

Describe the best practice for sampling/microscopy of parasites?

A

Primary lesion
Multiple samples
Scrape until capillary bleeding seen
View area systematically
x4-10
Condenser diaphragm partially closed
Look in house (mites are short lived)

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7
Q

Where is the best place to find parasites on a sheep scab?

A

superficial scraps at the leading edge of the lesion

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8
Q

How can skin scraps be used to monitor treatment for demodicosis?

A

Repeated monthly - treat until 2 consecutive sets of -ve scrapes
scrape same sites and record number of each life stage and % live vs dead

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9
Q

How can insects and arachnids be differentiated?

A
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10
Q

How can flies, fleas and lice be differentiated?

A
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11
Q

How can chewing/biting and sucking lice be differentiated?

A
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12
Q

How can ticks and mites be differentiated?

A

tick - 2-20mm
Mites - <1mm

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13
Q

How can hard ticks be differentiated?

A
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14
Q

How can surface and burrowing mites be differentiated?

A
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15
Q

How can burrowing mites be differentiated?

A
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16
Q

How can psoroptes/chorioptes be distinguished from other surface mites?

A
17
Q

What is the host species of damalinia (chewing lice)?

A

horse
cattle
sheep
goats

18
Q

What is the host species felicola (chewing lice)

A

cats

19
Q

What is the host species of trichodectes (chewing lice)

A

dogs

20
Q

What is the host species of Lipeurus, Cuclotogaster, Menacanthus (chewing lice)`

A

birds

21
Q

What is the host species of Gliricola sp, Gyropus sp (chewing lice)

A

guinea pig

22
Q

what is the host species haematopinus (sucking lice)

A

cattle
pigs
horses

23
Q

What is the host species of linognthus (sucking lice)

A

cattle
sheep
goats
dogs

24
Q

What is the host species of psorptoes and chorioptes (surface mite)

A

cattle
SHEEP
horses
camelids
rabbits

25
Q

what is the host species for cheyletiella (surface mite

A

dogs
cats
rabbits

26
Q

what isa the host species of otodectes (surface mite)

A

dogs
cats

27
Q

What is the host species of dermanyssus /red mite (surface mite)

A

poultry
wild birds

28
Q

what is the host species of ornithonyssus/northern fowl mite (surface mite)?

A

poultry
wild birds

29
Q

What is the host species of chirodiscoides (surface mite)?

A

guinea pig

30
Q

What isthe host species of listrophorus (surface mite)

A

rabbit

31
Q

What is the host species of neotrombicula/harvest mite (surface mite)?

A

dogs
cats
horses

32
Q

What is the host species of sarcoptes (burrowing mites)

A

DOG
(horses, cattle, sheep, pigs, cat)

33
Q

what is the host species of notoedres (burrowing mite)?

A

cat

34
Q

What is the host species of trixacarus (burrowing mite)?

A

guinea pig

35
Q

What is the hjost species of knemidocopted (burrowing mite)?

A

birds

36
Q

What is the host species of demodex (burrowing mite)

A

wide range
DOGS
HAMSTERS

37
Q
A

Jorge FCP (59 decks)

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