Parasites: Platyhelminthes_Cestodes (tapeworms) Flashcards
Two subclasses
Eustoda and Cotyloda
Cotyloda
pseudo tapeworms
Eustoda
True tapeworms
embryos
hexacanth egg packets or baskets
larval stage
metacestode
arthropod
intermediate host=flea
Metacestode: Cysticeroid
Mammalian
intermediate host=bladder worm
Metacestode: Cysticercus
variation of bladder worm
Metacestode: Hydatid cyst
metacesode: coenurus
variation of bladder worm
solid body, invagiated scolex, capable of asexual reproduction and can multiply exponentially
Metacestode: Tetrathyridium
route of infection
ingestion of intermediate host
predilection site
small intestine
adult stage
proglottids
variation of bladder worm
Metacestode: coenurus
body
strobilla
attachments
armed rostellum and acetabula
flea tapeworm, cucumber tapeworm, double pored tapeworm,
Dipylidium caninium
host=dog and cat
route=flea (ingest int host)
sign/symptom=asymptomatic, GI upset, pruritus
PPP=2-3 weeks
DX=fecal float: eggs, visual ID: proglottids
Tx=Praziquantel and Epsiprantel
Zoonosis=nocturnal irritability, anorexia, weight loss
canine taeniad
Taenia pisiformis
dogs
rabbit/hares (ingest of int host)
“feline taeniad”
Taenia taneiformis
cats
rabbit/hare (ing of int host)
coenurus producing tapeworm
Multiceps spp.
cat
rats and mice (ing of int host)
“hydatid tape worms
Echinoccocus granulosus
cat, dog, fox, cotoye=host
sheep, cattle, goat, pig (ing of int host)
zoo=cystic echinoccocis “hydatid cysts”
humans are the intermediate host
multiocular hydatid tapeworm
Echinococcus multicularis
dog
sheep, cattle, goat (ing of int host)
zoo=alveolar echinococcus-fatal!
humans are the intermediate host
“tapeworm of ruminants”
Monezia spp.
ruminants
Dx: fecal float, mc masters
grain mite/pasture mite (ing int host)
“dwarf tapeworm”
Hymenolepis nana
armed rostellum
flea, flour, bettle, cockroach (ing of int host)
zoo=headache, pruritus, difficulty sleeping
“rodent tapeworm”
Hymenolepis diminuta
unarmed rostellum
flea, flour, bettle, cockroach (ing of int host)
zoo=headache, pruritus, difficulty sleeping
“beef tapeworm”
Taenia saginata
ingestion of undercooked cattle
humans are the definitive host-Taemiasis
“pork tapeworm”
Taenia solium
ingestion of intermediate host swine
humans are the definitive host-Taemiasis
“zipper or sparganosis tapeworm”
Spirometra spp.
dogs and cats
fish and frog-fesh water (ing of int host)
zoo=”sparganosis” isceral migration: to skeletal muscles, subcutaneous tissue, ocular, CNS ( repeated headaches )
“broad fish tapeworm”
Diphyllobothrium latum
dogs, cat, pig, human
fresh water fish (ing of int host)
zoo=”diphyllobothriasis” Vit B12 deficiency and anemia
