parasite groups

what morphological features show that a parasite could be a flea

• few mm long

• lateral compressed body

• wingless

• long legs

how could you tell if a parasite was a louse

• few mm long

• dorso- ventrally compressed

• wingless

veterinary and public health importance of mosquitoes

• trasnport disease to both humans

  • dengue fever

  • malaria

  • viral encephalitis

  • filarial nematodes causing elephantiasis

• and animals

  • canine heartworm

  • avian malaria

what diseases does the tick ixodes sp. transmit in the UK

• louping ill

• tick borne fever

• tick pyaemia

• babesiosis

what life cycle stages do ticks and mites have in common

• egg

• larva

• nymph

• adult

how frequently is babesia seen in the uk

sporadically in cattle

what is the colloquial name for the disease caused by histomonas

blackhead

why is tocoplasma of medical and veterinary importance

• can cause reproductive loss in humans eg abortion, hydrocephalus, opthalmitis, mental retardation and sheep eg early embryonic loss, abortion, still birth, weak lamb

what is the function of the large schizont stage in the parasite life cycle and what is the name of the comma shaped organisms being liberated from some schizonts

• asexual multiplication

• merozoites

what is the function of the circle of hooks at the anterior end of the scolex and suckers

to help anchor the tapeworm in place on the intestinal wall of the host

what clinical signs can result from a metacestode growing near the cerebellum

• circling

• high stepping gait

• ataxia

how many potential tapeworms could develop in the final host from a single hyatid cyst

up to tens of thousands

where in the liver would you find adult fasciola and what would be the appearance

• bile duct

• grossly thickened bile duct walls (peribiliary fibrosis)

gross morphology of rumen fluke vs fasciola

short, plump and cylindrical compared to fasciola

what is the major cause of pathogenicity in schistosome infections

the passage of schistosome eggs through liver, bladder or intestinal wall

what are the four superfamilies with bursate males

• trichostrongyloidea

• strongyloidea

• ancyclostomtoidea

• metastrongyloidea

how many lips do ascarid worms have

3

if a parasite has no resistant stage that can survive in the environment how can it be transmitted from one host to another

by carnivorism or cannibalism