Strongyloides Flashcards
Strongyloides
non-bursate nematodes
Sf. Rhabditoidea and four examples of its species?
- threadworms
- Species in most animals-
eg:
– S. ransomi –pigs
– S. westeri –horses, foals
– S. canis- dogs
– S. stercoralis- humans
Strongyloides Westeri lifecycle
eaten or penetrate skin or foal can be infected by colostral transfer
Explain Strongyloides ransomi
swine
larve can be transferred with colostrum
placental transfer?
piglets infected within 24hr of birth
intestinal disease 2-4 weeks after infection
severe losses
Transmission uncommon in dry, clean piggeries as it doesn’t favour heterogonic life cycle
Sf Ascardoidea general Info and its 4 species?
large worms of intestine round worms species Toxocaracanis Toxocaracati Parascaris equorum Ascarissuum
ascaris lumbricodies life cycle
Larvae developed in faeces L1- L3 eggs eaten somatic migration tracheal migration Large adults intestine
toxocara canis general?
dog roundworm
- Ill- thrift, vomiting, diarrhoea
- Intestinal obstructions
- pot bellies in puppies
- note distinctive pitted egg
Toxocara canis Life cycle
control of roundworm
Anthelminthics (anti-worm) very effective
if no drugs?
- contamination of environment puppies big excretors
Visceral larva migrans
ocular larva migrans- larvae in eye
- rare, but occurs in indigenous communities
- Toxocara follows limited development in human host - ie does not follow tracheal migration but does wanter through tissues
Toxocara vitulorum
parasite of cattle
life cycle similar to that of T. canis indigos
- adults only appear in caves
- worms transferred from cows to calves with colostrum
Sf oxyuroidea
pin worms
very common inhabitants of colon of many species
human species- enterobius vermicularis
Oxyuris equi
horse species - itching/irritation around anus leads can lead to poor condition
pin worms life cycle
direct life-cycle
eggs laid in peri-anal region- eggs appear as white to yelllow crusty mass
Sf Trichinelloidea trichuis whipworm picture