Acari 2 Flashcards
Argasid ticks
- soft ticks
- no dorsal shield, scutum
- leathery tegument, spinose and bumpy
- mouthparts ventrally placed, so not visible dorsally
Otobius
- common name
- hosts
- identification
- spinose ear tick
- livestock, humans, dogs
- mouthparts not visible dorsally, integument short sharp spines
Otobius
-LC
- adults are not on the animal and do not feed!
- larvae and nymphs “taxied” long distances
Otobius
-Pathogenesis, lesions/ CS
- ear canals affected seriously in large tick buildups
- heavy infestations lead to anemia
Otobius
-Tx and prevention
- topical use of acaricidal applications in ear canals
- tx of premises
Argas
- common name
- host
- fowl tick
- domestic and wild fowl
Argas
-ID
-soft tick, leathery, textures body, lateral line, genital pore in larger female
Argasids:
- engorge rapidly to take advantage of available host
- survive arid conditions
- frequent feeding leads to opportunities to transmit pathogens
Argas
-site of infestation
on skin, but most of the time hide away from hosts
Acari (MItes)
-ID
-microscopic, body has scales, spines, setae (hairs), legs may have claws or suckers used to attach to host
Acari (mites)
-different strategies
- burrow into the host epidermis
- non burrowing; on skin surface
- restricted to an area of the body
Sarcoptes scabiei
- common name
- hosts
- Sarcoptic mange mite, itch mite, scabies mite
- all domestic animals and humans
Sarcoptes scabiei
-ID
-round, legs short, suckers on long unsegmented stalks differ b/t sexes
Sarcoptes scabiei
- Site of infestation
- Pathogenesis and lesions
- skin
- erythema, scale and crust formation
Sarcoptes scabiei-dog
-CS
- Begins on hairless areas of the body, lateral elbow and pinna of ear are common starting places
- Lesions of follicular papules, areas of erythema, crusts of dried serum and blood and pruritis
- thickened ear
Sarcoptes scabiei-dog
- Dx
- Tx & prevention
- skin scraping but recovery of mite difficult
- MCLs, tx of pets cures the humans they infest
Sarcoptes scabiei-swine
-main mode of transmission
- carrier sows to piglets during suckling
- during service b/t infested boars to gilts
- piglets: signs appear w/in 3 weeks of birth
Sarcoptes scabiei-swine
-pathogenesis and lesions/CS
- pigs scratch continuoisly and lose condition
- first lesions are wheals; general erythema around eyes, snout, external ears, front of hocks
- progress to scabs
- skin becomes wrinkled, covered w/ crusty lesions, thickened
- lesions progress to hyperkeratosis
Sarcoptes scabiei-swine
-Dx
- mites in wax from ear
- pruritus is frequently a better indicator of infestation than mite recovery, especially in sows and nursing piglets
Sarcoptes scabiei-swine
-Tx & prevention
- tx sow before farrowing
- macrocyclic lactones
Sarcoptes scabiei-cattle
-sites of infestation
-epidermal layers of skin
Sarcoptes scabiei-cattle
-pathogenesis/lesions/CS
- potentially most sever cattle mange
- mild infection-scaly skin
- severe infection-thickened skin
- downgrading of hides, drop in meat and milk production
Sarcoptes scabiei-cattle
- Dx
- Tx & prevention
- skin scrapping
- MUST BE REPORTED
- MCLs
- eprinomectin approved for lactating dairy cattle
Notoedres cati
- common name
- hosts
- noteodric cat mite
- cat, dog, rabbit
