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Parasitology > Mites > Flashcards

Mites Flashcards

0
Q

What hosts do dermanyssidae and macronyssidae mites parasitize

A

Birds and rodents, people in buildings when their normal hosts are removed (i.e. Rats exterminated or fledglings leave nest)

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1
Q

Which families of mites are considered mesostigmatid, and what does that imply?

A

Dermanyssidae, Macronyssidae, Halarachnidia

Mesostigmata - stigma in between legs 3 and 4

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2
Q

What hosts can Ornithonyces be found on

A

Birds - chickens and people who handle chickens

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3
Q

When would you likely find Dermanyssus on their avian hosts? Why?

A

Found on host at night - feed at night, hide during the day

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4
Q

Liponyssoides sangineus

Host
Associated Diseases

A

Host is house mouse

VEctor of rickettsial pox in humans

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5
Q

Which species have long and slender chelicerae with minute chelae

A

Liponyssoides

Dermanyssus

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6
Q

Ornithonyssus

Physical characteristics
Common species and their hosts
Associated diseases
Type of people affected

A

Chelicerae much stouter than those of dermanyssidae, readily visible chelae under ordinary magnification
O. Sylvarium - northern fowl mite
O. Bursa - tropical fowl mite
O. Bacoti - tropical rat mite - important in lab mice, intermediate host of ??????????

Stay on chickens and may feed on people handling chicken eggs

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7
Q

Ophionyssus natricis

Host
Treatment

A

Snakes

Ivermectin

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9
Q

Pneumonyssoides

Family
Host
Associated disease

A

Halarachnidia
Nasal and paranasal sinuses of dogs
P. caninum - chronic sneezing and epistaxis

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10
Q

Orthohalarachne

Family
Host

A

Halarachnidia

Respiratory tract of seals

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11
Q

Varroa destructor

Family
Host
Importance

A

Halarachnidia
Honey bee
Threat to US agriculture - honey production, pollination

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12
Q

What is the defining feature of astigmatids? What types of motes are astigmatids?

A

No breathing holes, breath through the skin.

Mange mites, some hair-clasping mites, 2 internal parasites of chickens and grain mites

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13
Q

What families are included in group, mange mites and what diseases are associated with them?

A

Sarcoptide, knemidocoptidae, Psoroptidae
Mange or scabies
Scabies - dermatitis characterized by pruritus, alopecia, and epidermal hyperplasia with desquamation. Rubbing and scratching may lead to oozing serum and blood.

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14
Q

Sarcoptes scabiei
Pretarsi characteristics
Associated disease and animals affected

A

Pretarsi with long unsegmented pedicels
Sarcoptic mange or scabies in humans, dogs, foxes, horses, cattle (reportable) and others.
Host specificity - when interspecific transmission occurs, resulting dermatitis is atypical and transient

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15
Q

Notoedres
Hosts
Pretarsi characteristics
Associated disease

A

Parasites of cats, rats, rabbits, occasionally and temporarily humans
Pretarsi have long unsegmented pedicels
Face mange in cats (Notoedres cati) starts on medial edge of pinna and spread to face, paws and hindquarters - alopecia, hyperkeratosis

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16
Q

Knemidokoptes
Species and their associated diseases
Animals affected

A

Knemidokoptes mutans - scaly leg in chickens, turkeys, pheasants and other galliinaceons birds - mites burrow in epidermis causing scales to lift and loosen, legs thickened and deformed

K. Pilae and K. Jamaicensis - mange od the legs, base of beak, vent area of parakeets, and back of canaries

17
Q

Psoroptes
Pretarsi characteristics
Species, associated diseases and affected animals

A

Pretarsi have long, 3 segmented pedicels
Psoroptes ovis - psoroptic mange (reportable) in cattle, sheep and horses
Psoroptes cuniculi - ear canker in rabbits, less severe form of otis acariasis in goats and horses

18
Q

Where on the skin does Psoroptes ovis live?

A

Does not burrow, but remains at base of hairs - pierce skin with stylet-like chelicerae
Resulting exudate on of serum hardens to form a scab

19
Q

What are the Pretarsi characteristics of Chorioptes bovis?

A

Short unsegmented pedicels on first, second and fourth pairs of legs of the female and all the legs of the male

20
Q

Chorioptes bovis

Hosts
Where on the host does this mite prefer to feed?
What do they eat?

A

Superficially dwelling
Preference for tail, escutcheon and legs of cattle, usually inflate winter, mildly pruritic
May be found on tail and legs of horses, sheep, and goats and in the ear canal of rabbits

21
Q

What is the scientific name for ear mites?
Pretarsi characteristics
Hosts

A

Otodectes cynotis
Short unsegmented pedicels on first and second legs of the female and all legs of the male
Infests external ear canal and adjacent skin of dogs, cats, foxes, and ferrets causing intense irritation

22
Q

Lynxacarus radovskyi

Family
Common name
Hosts
Geographic distribution

A

Astigmata
Hair-clasping mites
Domestic cats (cling to hairs imparting a scruffy appearance
Florida, Puerto Rico, Hawaii, Australia, Fiji

23
Q

Demodex

Family
Physical characteristics

A

Prostigmata

Tiny worm-like mites with short, stubby legs

24
Q

Name two species of demodex that live in the skin of the human face?
What portion the skin

A

Demodex folliculorum - hair follicles in human face

Demodex brevis - sebaceous glands in human face

25
Q

Canine Demodex

Host
Transmission
Disease
Clinical signs

Comparison

A

Demodex canis: Present in small numbers on the skin of most normal dogs in hair follicle
Transferred from dams to puppies during nursing
Demodactic mange in immunodeficient puppies 3-6mo old
Circumscribed areas of erythema and alopecia around the eyes, mouth and over bony projections on the extremities. No evidence of pruritis.

D. injai: about twice the length of D. Canis
Mainly found in sebaceous glands
Dorsal seborrheic dermatitis

D. cornei: shorter and. Stouter than D. canis
Lives in stratum corneum
Signs similar to D. canis

26
Q

Demodex cati

Disease severity and localization

A

Rarely noticed

Head and ear canals

27
Q

Demodex gatoi

comparison to demodex cati

A

More superficially dwelling than D. cati, found in stratum corneum of cats.
Shorter and broader than D. cati

28
Q

Demodex bovis

Host
Associated disease

A

Usually normal fauna of bovine skin: eyelids, vulva, scrotum

Can cause pinhead to egg sized nodules on neck and forequarters

29
Q

Demodex phylloides

Host
Lesion
Localization

A

Pigs

Nodules around eyes and on snouts, later spread to underside of body

30
Q

Demodex caprae

Host
Lesion

A

Milk goats

Nodular dermatitis

31
Q

Chelyletiella

Species and their preferential host and associated disease

A

Cheyletiella yasguri: dogs, walking dandruff
Ch. blakei: cats
Ch. parasitivorax: rabbits

Humans may serve as accidental or transitory host

32
Q

Psorogates

Family
Hosts and associated lesion

A

Prostigmata
Mice and primates
May cause mange-like condition

33
Q

Myobiidae

Distinguishing features
Species and preferred host
Clinical signs
Causes of outbreak

A

first pair of legs modified for clasping hair

Myobia musculi - lab mice
Radfordia ensifera - lab rats

Alopecia and erythema of dorsal neck region, self inflicted damage in severe cases

Stress and overcrowding

34
Q

Harpyrhynchidae

Hosts
Lesion and localization

A

Birds

Burrow in feather follicles or form large crusted cysts in skin

35
Q

Syringophilidae

Host
Localization
Associated disease

A

Birds
Lumen of feather quills
Nonpathogenic

36
Q

Trombiculidae

Larvae
Host and localization

A

Larvae called chiggers, only parasitic life stage

On skin or in ears of cats or dogs, or on faces or pasterns of ungulates, or under wings and around vents of birds

37
Q

Tarsonemidae

Important species and it’s host

A

Acarapis woodi - tracheal mite of honeybees

42
Q

Pneumonyssus

Family
Host
Associated disease

A

Halarachnidia
Lung parenchyma of most (or all) Macaca mulatta monkeys (Pneumonyssus simicola)
Pulmonary acariasis - pinhead (or >) sized lesions with a whitish or yellow foci that have soft or empty centers and contain mites and a black pigment in the center

Parasitology (8 decks)

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