Ectoparasites 3 Flashcards
what is another name for Cheyletiellosis?
walking dandruff
are Cheyletiellosis host specific?
no
highly contagious
what are the pathomechanisms of Cheyletiellosis spp?
inflammation
hypersensitivity
damage skin barrier
which Cheyletiellosis sp infects dogs and what does its dorsal soledidion on genu 1 look like?
Ch. yasguri
heart shaped
which Cheyletiellosis sp infects cats and what does its dorsal soledidion on genu 1 look like?
Ch. blakei
conical
which Cheyletiellosis sp infects rabbits and what does its dorsal soledidion on genu 1 look like?
Ch. parasitivorax
globe
what are the clinical features of Cheyletiellosis spp?
none to severe pruritus
scaling
erythema
alopecia
seborrhea
cats: skin reaction patterns
papules
crusting
how do you treat Cheyletiellosis spp?
avermectins
lime sulfur dips
fipronil (not in rabbits)
off label isoxazolines
how do you diagnose Cheyletiellosis spp?
acetate tape or superficial skin scrape
dermoscope
what causes sarcoptic, psoroptic, and chorioptic mange in dogs, cats, exotic, and farm animals?
superficial mites
class arachnida
what are the pathomechanisms of sarcoptic, psoroptic, and chorioptic mange?
inflammation
hypersensitvity
damage skin barrier
irritation
how can you use the epimeres to distinguish between Sarcoptes/Notoedres sp, Otodectes sp, and Psoroptes/Chorioptes sp?
Sarcoptes/Notoedres sp: only first epimere fuse: Y shape
Otodectes sp: first and second epimere fuse: triangular shape
Psoroptes/Chorioptes sp: epimere do not fuse
what species causes sarcoptic mange in dogs?
Sarcoptes scabiei var. canis
what is the distribution of skin lesions in a dog with sarcoptic mange?
hocks
elbows
ears
inguinal region
what skin lesions can be seen with sarcoptic mange?
pruritus
erythema
papules/pustules
scaling
alopecia
crusts
excoriations
lichenification
hyperpigmentation
how is sarcoptic mange diagnosed (after history and exam)?
superficial skin scrapings: 50-80% false negatives
serologic test
therapeutic trial
pinnal-pedal reflex
histopathologic examination
what are signs of Notoedric mange in cats?
severe pruritus
alopecia
erythema
excoriations
papules
crusts
scaling
lichenification
secondary infections
where are skin lesions seen with Notoedric mange in cats?
pinnae
face, neck
feet, perineum
who does Otodectes cynotis infect?
dogs
cats
ferrets
where does Otodectes cynotis impact?
ear mite
might extend to neck, rump, tail
who does Psoroptes cuniculi infect?
rabbits
may affects goats, sheep, horses
where does Psoroptes cuniculi impact?
external ear canal
who does Trixacarus caviae infect?
guinea pigs
most pathogenic ectoparasite of
what does Trixacarus caviae cause?
intense pruritus (can be seizure-like)
alopecia
scaling
crusts
where on the animal does Trixacarus caviae impact?
ventral abdomen
neck
shoulders
generalized
what causes Psoroptic mange?
Psoroptes ovis
who does Psoroptes ovis infect?
bovine
caprine
ovine
horses
rabbits
what does Psoroptes ovis cause?
intense pruritus
alopecia
erythema
scales
yellow-green pustules
thick yellowish crusts
economic losses
where does Psoroptes ovis impact?
head
shoulders
back
rump
entire body
what causes Chorioptic mange?
Chorioptes bovis
who does Chorioptes bovis infect?
bovine
caprine
ovine
horses
rabbits
what does Chorioptes bovis cause?
variable pruritic
alopecia
erythema
scales
papules
crusts
which horse breeds are predisposed to Chorioptic mange?
horse breeds with feathered fetlocks
where does Chorioptes bovis impact?
tail, distal limbs
generalized: legs, ventrum
which two parasites are worse in winter?
Psoroptes ovis
Chorioptic bovis
which diseases have severe pruritis associated with them?
Trixacarus caviae
Notoedric mange
Sarcoptic mange
Psoroptic mange
which diseases/mites have variable pruritis associated with them?
Cheyletiellosis spp
Otodectes cynotis
Psoroptes cuniculi
Chorioptic bovis
