Deck 54: Tissue Cestodes

Question 1

Fur trappers and veterinarians are at an increased risk for this infection by being exposed to infected animals.The intermediate hosts of the organism, Echinococcus multilocularis, are:

A) foxes.
B) coyotes.
C) rodents.
D) humans.

Answer 1

C
E.multilocularis is found in Asia, Europe, and northern North America, including areas such as Alaska, Montana, and Minnesota.Fur trappers and veterinarians are at an increased risk of infection as a result of exposure to infected animals.Foxes, coyotes, and dogs are the definitive hosts for E.multilocularis, whereas rodents are the intermediate hosts.

Question 2

The Taenia multiceps tapeworm is 5 to 6 cm long and consists of 200 to 250 segments.It has four suckers in its scolex and a proboscis with 22 to 32 hooks arranged in two rows.This organism causes which condition?

A) Coenurosis
B) Cysticercosis
C) Hydatid disease
D) Sparganosis

Answer 2

A
T.multiceps is a tapeworm that causes coenurosis in humans.The coenurus, or larval form, of the tapeworm may cause destructive damage or death, but coenurosis is an extremely rare disease in humans.The coenurus is a unilocular cyst similar to cysticercus, although the worm has multiple scolices.Daughter cysts may also be observed.The body of T.multiceps is 5 to 6 cm long and consists of 200 to 250 segments.The scolex has four suckers and a proboscis (tubular appendage)with 22 to 32 hooks arranged in two rows.

Question 3

Hydatid disease is associated with which tapeworm?

A) Taenia solium
B) Echinococcus granulosus
C) Spirometra mansonoides
D) Echinococcus multilocularis

Answer 3

B
Hydatid disease is associated with E.granulosus.Echinococcus is the smallest of all tapeworms (3 to 9 mm long)with three to five proglottids.Disease symptoms vary with the site and size of the cyst.The presence of one or more cysts (hydatids), which can develop in any tissue, results in echinococcosis (hydatid disease).

Question 4

In Echinococcus granulosus infections, the hydatid cysts usually occur in which organ?

A) Stomach
B) Brain
C) Intestines
D) Liver

Question 5

Epileptic seizures, headaches, and mental disturbances all result from infection with the Taenia solium organism.The definitive diagnosis is based on:

A) positive direct fluorescent antibody test.
B) observance of eggs in the stool.
C) positive India ink stain.
D) identification of cysts in tissue.