Card Set Information
Do spirurids have intermediate hosts?
What is the intermediate for spirurids?
What is the life cycle for spirurids?
IH ingests L1 from DH
develops to L3 within the IH
L3 is transmitted to DH
What is Onchocerca cervicalis?
nuchal ligament worm
How big do adult Onchocerca cervicalis get?
30 cm long
Who is the definitive host of Onchocerca cervicalis?
Who is the intermediate host for Onchocerca cervicalis?
What are midges?
biting bugs that you can't see
What is the life cycle of Onchocerca cervicalis?
microfilarae (L1) are ingested by midges as they feed
development to L3 takes 20 - 25 deays in midge
infection with L3 occurs during feeding by the midge
What is the infection site for Onchocerca cervicalis?
: nuchal ligament (holds head up)
: conjunctiva, lens, dermis, and other connective tissues
How do you diagnose Onchocerca cervicalis?
What is Habronema?
stomach worm of horses
What is the definitive host for Habronema?
What is the intermediate host for Habronema?
houseflies and stable flies
What is the infection site for Habronema?
: stomach mucosa
: skin (cutaneous granulomas, nictitating membrane)
What is the life cycle of Habronema?
larvae or eggs are passed in feces and ingested by maggots of house or stable flies
L1 develop to L3 in one week within maggot, as maggots turn into flies.
L3 move out of the fly via the proboscis as the fly feeds on to the horse's lips, nostrils, or wounds
Larvae mature in the stomach
L3 must be ingested and reach the stomach to mature; otherwise, only cutaneous infection occurs
What is the pathogenesis of Habronema?
cutaneous habronemiasis (summer sores, swamp cancer) - larvae cause large, granulomoas that are extremely prurtic
How are Habronema diagnosed?
eggs or L1 rarely found in fecal exam
Cutaneous infection (history, appearance, biopsy)
What is Draschia?
similar to Habronema
What is Thelazia species?
eyeworms (dogs, cats, horses, human)
What is Thelazia lacrymalis?
eyeworms of horses
transmitted by face fly
larva migrates to the eye (3 months until adult)
What is the pathology of Thelazia?
infections are asymptomatic
often see opacity, hyphema, parasite
What is Spriocerca lupi?
esophageal worm of dogs
What is the intermediate host of Spriocerca lupi?
What are paratenic host of Spirocerca lupi?
chickens, reptiles, rodents
What is the life cycle of Spirocerca lupi?
eggs in feces
ingested by beetle
develops to L3
dog ingesets beetle or paratenic host
migrates thru stomach wall then to the aorta then to the esophagus
adults lay eggs and are passed in feces
What is the pathogenesis for Spirocerca lupi?
most dogs have no clinical signs
larvae may migrate into wall of aorta then cause aneurysm
adults in wall of esophagus then cause sarcoma
What is hypertrophic osteopathy?
diffuse periosteal proliferative condition of long bones in dogs
secondary to neoplastic or infectious masses in the thoracic or abdominal cavity
What are the clincial signs of hypertrophic osteopathy?
lameness, long bone pain, and signs of secondary to body cavity mass
How is hypertrophic osteopathy diagnosed?
How is Spirocerca lupi diagnosed?
How are Spirocerca lupi treated?
What is physaloptera?
stomach worm of dogs and cats
What is the intermediate host of Physaloptera?
beetle or roach
What are the clinical signs of physaloptera?
How do you diagnose physaloptera?
heavy egg on float (zinc oxide)