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60 Cards in this Set

  • Front
  • Back
What are the 4 life stages of ticks and mites?
Egg, Larva, Nymph, Adult
What are the 2 parts of their body?
Capitulum (gnathosoma) and Idiosoma
What makes up the Capitulum?
Chelicerae, Hypostome, Palps
What is the life CYCLE of the typical parasitic mite?
-All stages on the host
-Usually short
-Transmitted by direct contact, fomites
-Doesn't survive well off host
What are the 3 genera of Sarcoptic Mites?
General characteristics of Sarcoptic mites
-Round bodies
-Last 2 pairs of legs are short
-Burrowing mites
Life CYCLE of Sarcoptic mites
-Female makes tunnels
-3 weeks
-Easily spread
Diagnosis of Sarcoptic mites
Skin Scraping
May be difficult to find mites
May find mites or eggs on fecal
What is most common in dogs in the US?
Sarcoptes scabiei
Clinical Signs of Sarcoptes scabiei
Mites like hairless areas or thin hair
Intense pruritus
Chronic infestation=alopecia, thickened, wrinkled skin, secondary bacterial infection, self inflicted trauma
What is the treatment for Sarcoptes?
Treat all animals
Macrolides used most often
Zoonotic potential?
lesions in areas of contact

humans have own Sarcoptes
Sarcoptes in swine
lost production in young pigs
old sows are carriers
eradicable from closed system with macrolides
Sarcoptes in LA species
Rare in ruminants
Can cause severe disease in camelids
LA tx is the same--macrolides
Rare sarcoptic mange mite of the cat

Lesions on the head and neck
Notoedres cati
Sarcoptic mange mite of birds, lesions on non feathered portions (white crusty honeycomb), can be serious, progressive disease
Knemidocoptes species
What are the 3 genera of Psoroptic mites?
Psoroptes, Chorioptes, Otodectes
General characteristics of Psoroptic mites
-surface dwellers
-oval with longer legs
-short life cycle (2 wks)
-dx by skin scrape
Highly contagious severe mange in ruminants, notifiable but importance is diminishing
Psoroptes ovis
Primary otic parasite of rabbits
Psoroptes cuniculi
Ruminants and occasionally in horses, often on the legs, tailhead in cattle, foot or leg on horses (feathered)
Common ear mite of dogs and cats, ferrets and cause otitis externa and intense pruritis
Otodectes cynotis
Canine mange
Cigar with legs
In sebaceous glands, interfere with function
Infected early via dam
Mostly Asymptomatic
2 forms of Demodex canis
Localized form--some pups, small hairless regions 90% resolve on their own
Generalized form--progressive spread in 10% of localized pup cases, also when onset happens as adult
Clinical signs of Demodex canis
Pruritus later
More often in purebred, shorthair dogs
Diagnosis and treatment of D. canis
skin scrape, eggs and mites in feces, ^mites and juveniles=dec. prognosis

Amitraz, macrolides, don't breed animals with history of generalized disease
Walking dandruff--infrequent in dogs, cats, rabbits; surface mite; few CS
Diagnosis and treatment of Cheyletiella
Scotch tape, brushings

Fipronil, selamectin, environmental control

Zoonosis in areas of contact
Probably more related to ticks, look like them but small
Mesostigmatid mites
Examples of Mesostigmatid mites
Ornithonyssus sylviarum (northern fowl mite)

Dermanyssus gallinae (red poultry mite)
avian bloodsucking mite
entire life on host
can decrease weight gain and egg production
species of rodents can cause human problems
Ornithonyssus sylviarum
Parasite of poultry and wild birds
on host at night--bloodsucking
dx by finding red or black mites in environment during the day
can be a pest to people
Dermanyssus gallinae
Chiggers, Harvest mites
only larvae are parasitic
usually red or orange
attach for several days-intense pruritus after mites are gone
tx is symptomatic
Trombiculid mites
Tick Phylum _______ , Class _______

Soft ticks are Family _______ and Hard ticks are Family ________

Basic Hard tick life cycle
Egg no legs-->Larvae 3 pairs of legs-->Nymph 4 pairs of legs-->Adult 4 pairs of legs
Why are ticks good disease vectors?
Persistent blood feeders
Feed slowly
Highly scerlotized
Few natural enemies
Wide host range
Long Lived
High repro potential
2 parts of a tick body
Capitulum and Idiosoma
Parts of the Capitulum
Basis capituli and Mouth parts (palps, chelicerae, hypstome)
Do all ticks transmit pathogens in the same time frame?
No...some pathogens take different time periods to be transmitted by the same tick species...also the same tick genera make take different times to transmit the same pathogen
How do ticks seek their host?
Ticks that live along paths, trails, etc. where host will pass are _________
Which tick transmits Lyme Disease?
Ixodes (scapularis, pacificus, ricinus)
Ixodes scapularis has a life cycle that lasts for up to ___ years and it utilizes ____ hosts during that time
2 and 3
What is the defining characteristic of Ixodes in general? What tells you its an adult?
Anal groove

Genital opening
What tick species possesses a white star on its back?
Amblyoma americanum
What diseases does A. americanum transmit?
Human monocytic ehrlichiosis (E. chaffeensis)
Canine and human granulocytic ehrlichiosis (E. ewingi)
The American dog tick
Dermacentor variabilis
How long is the life cycle of Dermacentor?
1-2 years
Dermacentor transmits (3 diseases)
Cytauxzoan felis
E. canis
Is Dermacentor Ornate? Does it have festoons?
Yes for both
The brown dog tick
Rhipicephalus sanguineus
Can complete its life cycle in _______
2 months
Rhipicephalus transmits...
E. canis
Possibly A. platys
Babesia canis and B. gibsoni
What is the defining characteristic of Rhipicephalus on the basis capituli?
Lateral expansions
Is Rhipicephalus ornate?
Texas cattle fever tick (1 host). Still in the US?
Rhipicephalus (Boophilus) annulatus

No, eradicated to Mexico
Ascending motor paralysis from toxic substances in saliva
Tick paralysis
How is tick paralysis treated?
Remove the tick!!
Modes of tick control
Manual removal