Strongyloides Flashcards

1
Q

Strongyloides

A

non-bursate nematodes

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2
Q

Sf. Rhabditoidea and four examples of its species?

A
  • threadworms
  • Species in most animals-
    eg:
    – S. ransomi –pigs
    – S. westeri –horses, foals
    – S. canis- dogs
    – S. stercoralis- humans
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3
Q

Strongyloides Westeri lifecycle

A

eaten or penetrate skin or foal can be infected by colostral transfer

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4
Q

Explain Strongyloides ransomi

A

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

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5
Q

Sf Ascardoidea general Info and its 4 species?

A
large worms of intestine
round worms
species
Toxocaracanis
Toxocaracati
Parascaris equorum
Ascarissuum
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6
Q

ascaris lumbricodies life cycle

A
Larvae developed in faeces L1- L3 
eggs eaten
somatic migration
tracheal migration
Large adults intestine
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7
Q

toxocara canis general?

A

dog roundworm

  • Ill- thrift, vomiting, diarrhoea
  • Intestinal obstructions
  • pot bellies in puppies
  • note distinctive pitted egg
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8
Q

Toxocara canis Life cycle

A
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9
Q

control of roundworm

A

Anthelminthics (anti-worm) very effective
if no drugs?
- contamination of environment puppies big excretors

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10
Q

Visceral larva migrans

A

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
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11
Q

Toxocara vitulorum

A

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

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12
Q

Sf oxyuroidea

A

pin worms
very common inhabitants of colon of many species
human species- enterobius vermicularis

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13
Q

Oxyuris equi

A

horse species - itching/irritation around anus leads can lead to poor condition

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14
Q

pin worms life cycle

A

direct life-cycle

eggs laid in peri-anal region- eggs appear as white to yelllow crusty mass

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15
Q

Sf Trichinelloidea trichuis whipworm picture

A
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16
Q

Trichuris eggs

A
17
Q

Habronema and Draschia

A

Equine stomach worm

18
Q

life cycle of habronema

A
19
Q

Sf Filarioidea general

A

filpriid worms
tissue parasites
adults are very long
as parasitism is in the tissue, it has difficulty escaping for parasitism

20
Q

Sf filarioidea vectors of transmission

A
biting insects
all spirurida (The order to which filarioids belong) use insect intermediate host (indirect life cycle)
use biting insect as intermediate host