Cestode Flashcards
dipylidium caninum
Intermediate host ?
Metacestode stage?
IH: Larval fleas (ctenocephalides felis/canis and pulex irritans)
canine chewing louse (trichodectes canis)
Metascestode stage: cysticercoid
(1 scolex/Not invaginated)
Metacestode stages
Cysticercoid Strobilocercus Cysticercus Coenurus Hydatid cyst
Cysticercoid (Scolices/Vagination)
1 scolex NO invagination
Strobilocercus (Scolices/Vagination)
1 scolex NO invagination
Cysticercus (Scolices/Vagination)
1 scolex INVAGINATED
Coenurus (Scolices/Vagination)
MANY scolices, INVAGINATED
Hydatid Cyst (Scolices/Vagination)
MANY scolices, INVAGINATED
Identification of cyclophyllidea
scolex with 4 acetabula +/- armed
strobila of proglottids
taeniid species with cysticercus metacestode stage
Taenid..
ovis
hydatigena,(MC called cysticercus tenuicollis)
pisiformis
taeniid species with strobilocercus metacestode stage
Taenid taeniaeformis (MC called cysticercus fasciolaris)
taeniid species with unilocular hydatid cyst metascestode stage
Echinococcus granulosus (MC called unilocular hydatid cyst)
taeniid species with multilocular hydatid cyst metacestode stage
echinococcus multilocularis (MC called multilocular hydatid cyst)
taeniid species with coenurus metacestode stage
Taenia multiceps (MC called coenurus cerebralis) Taenia serialis (MC called coenurus serialis)
taeniid species
T. taeniaeformis pisiformis ovis hydatigena multiceps serialis Echinococcus granulosus Echinococcus multilochularis
Cyclophyllidea species
Dipylidium canincum
Taeniid spp.
Pseudophyllidean species
Spirometra mansonoides
diphyllobothrium spp.
IH host and location of Taenia taeniaeformis MC stage (strobilocercus) called cystocercus fasciolaris
Rodent
LIVER … ingested by felids
Treatment of Cyclophyllidea (preferred tx for taeniid*)
Fenbendazole* praziquantel, episiprantel
IH host and location of T. pisiformis MC stage
(cysticercus) called c. pisiformis
Rabbit +/- other rodents
peritoneal cavity
taeniid spp. ID
LARGE
sculex often ARMED,
proglottid LONGER than wide with ONE genital pore per proglottid on alternating sides
brown radiating/striated egg with hexacanth embrphore
IH host and location of Taeniia hydatigena MC stage
(cysticercus) called c. tenicollis*
IH symptoms
ruminant (sheep/goat) +/- pigs
PERITONEAL CAVITY
hemmoragic/fibrotic migration tracts. Lambs traumatic hepatitis and death
IH host and location of Taeniia ovis MC stage
(cysticercus) called c. ovis
ruminant (sheep/goat)
SKELETAL AND CARDIAC MUSCLE
IH host and location of Taeniia multiceps MC stage
(coenurus) called coenurus cerebralis*
IH symtoms
ruminants (sheep/goat)
BRAIN and SPINAL CORD
IH signs depend on age location but lambs acute meningioencephalitis
which taeniid spp. use rabbits* / rodents as IH for MC stage
taenia taeniaformis (liver) –> cats
t. pisiformis (peritoneal cavity)*
t. serialis (SQ/IM connective tissue)*
+/- echinococcus multilocularis
Which taeniid spp. use rumintants (sheep/goats) as IH for MC stage
Taenia ovis (skeletal and cardiac muscle)
t. hydatigena (perintal cavity)
t. multiceps (brain/spinal cord)
+/- echinococcus granulosus
IH host and location of Echinococcus granulosus MC stage
(unilocular hydatid cyst)
IH symptoms
Cattle, sheep +/- horse pigs HUMANS
LUNG LIVER BRAIN
dependent on organ effected
chyclophyllidea with zoonotic potential
Dipylidium caninum (DH) SI Echinococcus granulosus (IH) lung liver brain Echinococcus multilocularis (IH) lung liver
IH host and location of Echinococcus multilocularis MC stage
(multilocular hydatid cyst)
IH symptoms
rodents +/- dogs, HUMANS
LUNG LIVER
depending on organ effected (domestic animals usually no CS)
IH host and location of Taeniia serialis MC stage
(coenurus) called coenurus serialis IH symtoms
Rabbits
SQ and IM connective tissue
IH minimal SC bladders +/- impaired muscle function depending on location
taenia ovis MC type and name
cysticercus = cysticercus ovis
taenia hydatigena MC type and name
cysticercus
cysticercus tenuicollis*
taenia pisiformis MC type and name
cysticercus = cysticercus pisiformis
taenia taeniaeformis MC type and name
Strobilocercus
cysticercus fasciolaris
taenia multiceps MC type and name
coenurus
coeneruscerebralis*
Taenia serialis MC type and name
coenurus = coenerus serialis
Echinococcus multilocularis MC type and name
multilocular hydatid cyst (with brood capsules and budding daughter cysts)
Echinococcus granulosus MC type and name
unilocular hydatid cyst (with brood capsules)
pseudophyllidean characteristics (hosts)
TWO intermediate hosts AQUATIC
- copepod with procercoid
- vertebrate (fish/frog) with plerocercoid
pseudophyllidean characteristics (pores and eggs/embryo type)
MEDIAL genital AND uterine pores!*
Operculated eggs
ciliated embryo= coracidium
pseudophyllidean characteristics (scolex)
Scolex with two bothria
pseudophyllidean characteristics (MC type)
(2 MC types)
procercoid
plerocercoid /sparganum
Cyclophyllidean characteristics (hosts and MC types)
ONE TERRESTRIAL IH (5 MC types) Strobilocercus cysticercoid cysticercus coenurus Hydatid cyst
Cyclophyllidean characteristics (pores and eggs/embryo type)
Lateral genital pores
hexacatnth embryo
Cyclophyllidean characteristics (scolex)
+/- acetabulum (4 suckers) and hooks (armed)
life cycle of psedophyllidean
OPERCULATED egg in env, ciliated embryo (CORACIDIUM) emerges ingested by copepod (1 IH) –> procercoid in BODY CAVITY. ingested by vertebrate (fish snake frog rate) procercoid migrate to MUSCLE/CONNECTIVE TISSUE –> pleruocercoid/sparganum encyst. ingested by DH ( cats dogs racoon)
geographic distribution of spirometra mansonoides
Southern US
Psudophyllidia with zoonotic potential
spirometra mansonides (2nd IH) if ingest infected 1st IH or other 2nd IH (or skin as ointment)
geographic distribution of diphyllobothrium spp.
North US (great lakes)
treatment of psudophyllidians
praziquantel
only product approved for Echinococcus spp. (granulosus and multilocularis)
Praziquantel
taeniid spp vs echinococus spp. eggs
**CAREFULL!*
indistinguishable, require PCR
echinoccocus species have zoonotic potential (human IH)
