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Parasitology4
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Autoinfection of threadworms
Strongyloides stercoralis
Strongyloides papillosus transmission
percutaneous - sheep
transmammary - cattle
threadworm in horses
Strongyloides westeri
threadworm in pigs
Strongyloides ransomi
Threadworm cycles
homogonic
heterogonic
worms attached to gastric glands
Physaloptera spp
Pinworms
Oxyuris equi
Physaloptera spp transmission
Ingestion of IH or paratenic host with infective L3
Physaloptera IH ingests
Egg with L1
subcutaneous filariid
Acanthocheilonema reconditum
Heart worm prevention is effective against
L3 & L4 until day 45
Heartworms molt to immature adults where
subQ tissues & muscle
PPP for heartworms
6-9 months
IH for heartworms
Anopheles
Culex
Aedes
Hookworm transmitted peroral route
Uncinaria stenocephala
Causes CLM in humans
Strongyloides
: papilosus & stercoralis
Ancylostoma
: caninum & braziliense
Uncinaria stenocephala
Only hookworm transmitted transmammary
Ancylostoma caninum
cat only hookworm
Ancylostoma tubaeforme
percutaneous hookworm of both dogs & cats
Ancylostoma braziliense
This hookworm arrests in tissues of older animals
Ancylostoma caninum
Hookworms
Ancylostoma:
- braziliense
- tubaeforme
- caninum
Uncinaria stenocephala
Hookworm PPP
2 weeks
Hookworm egg to L3
Egg with L1 hatches
develops to infective L3 in environment
Ingestion of hookworm L3 results in
migration to lungs & molt to L4
molt to L4 in crypts of SI
Ingestion of paratenic host containing hookworm L3 results in
molting to L4 in crypts of SI
Hookworm L4 to adult occurs in
lumen of SI
Migration occurs in all but this method of transmission of threadworms
Transmammary
No transplacental migration in this threadworm
Strongyloides westeri
Pinworm transmission
ingestion of egg containing infective L3
Pinworm egg hatches where
SI
Immunocompromised animals that have been previously infected with hookworms
Secondary infection (reactivation) and movement to SI crypts for molting
This hookworm infection occurs in young animals and you will not find eggs in the feces
Peracute
Hookworm infection of older pups/adults which results in severe anemia
acute
Hookworm infection where clinical signs are not usually apparent
chronic
Ascarid eggs contain infective L_
L3
Ascarid eggs hatch where
SI
hepatopulmonary migration occurs with
Parascaria equorum
Ascaris suum
Toxocara canis
Earthworms/dungbeetles can be paratenic host for this zoonotic ascarid
Ascaris suum
rodents are paratenic hosts for this ascarid
Toxascaris leonina
No hepatopulmonary migration when the L3 of this ascarid is ingested
Toxascaris leonina
PPP for Toxocara infections
3 weeks
Important mode of transmission for T. cati
paratenic host
Raccoon is definitive host for this ascarid
Baylisascaris procyonis
Diffuse Unilateral Subacute Neuroretinitis is specifically associated with what parasite
Baylisascaris procyonis in paratenic hosts
infective stage of trichinella
L1
Trichinella females produce
immature L1
Trichinella larvae molt when
after ingested by definitive host (in small intestine)
Adult trichinella live in
small intestine
Trichinella spp (encapsulated)
spiralis
murrelli - not swine
nativa - eskimos
nelsoni - africa
britovi - eurasia
T6 - wild carnivores in US
Non encapsulated trichinella spp
pseudospiralis (birds)
papua (swine & crocks)
zimbabwensis - (lizards, crocks)
Post mortem slaughter testing for Trichinella is done by which methods
Compression method
Pooled Sample Digestion method
This species does not have whip worms
Horses
These animals do not have pinworms
cat & dogs
Whipworm transmission
Ingestion of egg containing infective L1
Whipworm eggs hatch where
small intestine
Whipworm maturation
4 molts to immature adult in cecum/colon
Whipworm species
Trichuris ovis
Trichuris suis
Trichuris vulpis - dogs
Capillarid genera + location
Eucoleus - respiratory
Pearsonema - urinary
Aoncotheca - gastrointestinal
Calodium - hepatic
nasal capillarid of dogs
Eucoleus boehmi
capillarid of felids, canid, mustelids
Eucoleus aerophilus
Eucoleus aerophilus is acquired by
ingestion of paratenic host or egg with infective L1
Eucoleus aerophilus eggs are ingested and then what
Larvae hatch and migrate to the lungs
Eucoleus boehmi eggs are deposited where
lungs
Detection of Capillarids
Fecals or histology
Infective form for Strongyloides
L3
Infective form of Oxyuris equi
Egg with infective L3
Trichuris spp lives in
cecum/colon
Eucoleus spp lives in
respiratory
Pearsonema species lives in
urinary
Aoncotheca spp lives in
gastrointestinal
Calodium spp lives in
liver
Physaloptera spp live in
stomach
Ancylostoma/Uncinaria spp. live in
Small intestines (somatic tissues)
Oxyuris spp lives in
colon
Rhabiditids live in
small intestine (homogenic)
external environment (heterogenic)
Author
kenleyc
ID
319530
Card Set
Parasitology4
Description
parasitology
Updated
2016-04-28T23:42:07Z
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