Medically important cestodes Flashcards
Commonly called tapeworms
Class Cestoda
Adults inhabit the ____ of vertebrate
Small intestine
____ parasitize the tissue of both vertebrates and invertebrates
Larva
Head of the organism
Scolex
retractable, cone-like structure on anterior end of scolex, sometimes have hooks
Rostellum
Long, narrow muscular grooves of pseudophyllidean tapeworms
Bothria
Suckers of cyclophyllidean tapeworms
Acetabula
Distinct types of proglottids
- Immature - no well-developed organs
- Mature - Well-developed organs
- Gravid - Filled with eggs
Sperm is delivered to female organ via ____
copulatory spicules
The uterus of pseudophyllidean is ____
non-branching
The uterine pore of cyclophyllidean is ____
Absent
Dibothriocephalus latus is formerly known as
D. latum
Largest tapeworm that can infect human
Dibothriocephalus latus
Infective stage of Dibothriocephalus latus
Plerocercoid (L2)
1st intermediate host of Dibothriocephalus latus
Copepods
2nd intermediate host of Dibothriocephalus latus
Fish
Dibothriocephalus latus may cause ____ anemia
Pernicious anemia
Vitamin deficiency caused by Dibothriocephalus latus
B 12
Treatment for Dibothriocephalus latus
- Praziquantel (preferred)
- Niclosamide
- Vitamin B 12 supplements
Spirometra mansoni reproduce in ____
canines and felines
Humans are ____ hosts of Spirometra mansoni
Dead-end
1st Intermediate host for Spirometra mansoni
Cyclops
2nd intermediate host for Spirometra mansoni
Fish
Ingestion of infected ______ will result in sparganosis
A. Cyclops
B. Fish
A. Cyclops
H. nana is also called ____
dwarf tapeworm
Ingestion of ______ from contaminated food and water will cause H. nana infection
embryonated eggs
Autoinfection of H. nana in immunocompromised individuals may lead to ____
Tumors
H. diminuta is also called ____
Rat tapeworm
Intermediate hosts of H. diminuta
T.confusum and T. castaneum
Infective stage of H. diminuta
Cysticercoid larvae
H. diminuta most notable clinical manifestation
Eosinophilia
Treatment for H. diminuta
- Praziquantel
- Niclosamide
- Nitazoxanide
Also known as Hydatid tapeworm
Echinococcus Tapeworm
The larval form (protoscolices) of E. granulosus may lodge in various body sites where they form a fluid-filled sac known as a _____
hydatid cyst
germinal epithelium lining the hydatid membrane produces daughter cysts containing multiple scolices, called a _____
Brood capsule
Definitive host of E. granulosus
Dogs
Hydatid cysts are located most often in the _____
liver and lungs
The presence of a _____ in a person with a
history of exposure to ____ in an area where E. granulosus is endemic suggests a diagnosis of cystis echinococcosis.
cyst-like mass
Sheepdogs
These treatments replace surgery for cystic echinococcosis
Chemotherapy, cyst puncture, and PAIR
At the anterior tip of the scolex of E. multilocularis is a ____
rostellum
In intermediate hosts, the metacestode of E. multilocularis, or larval stage, takes the form of an ____
alveolar hydatid cyst
Definitive hosts of E. multilocularis
Foxes
Intermediate hosts of E. multilocularis
Small rodents
Infective stage of E. multilocularis
Embryonated eggs
Diagnostic stage of E. multilocularis
Alveolar hydatid cyst
What cestode follows a ____
Prey-predator life cycle
Dipylidium caninum is also known as _____
Flea tapeworm
Cucumber tapeworm
Double-pored tapeworm
Diagnostic stage of D. caninum
Gravid proglottids
Infective stage of D. caninum
cysticercoid-infected adult flea