Cestodes

Question 1

Describe Cestodes

Answer 1

-have scolex for head -Are in chains of strobili containing proglotids -All are hermaphrodites -Humans serve as intermediate host

Question 2

Taenia solium

Answer 2

Taenia solium (WORM) – Eating wrongly cooked pork, Causes indigestion and diarrhea. Cysticercosis- eating T. Solium eggs from human feces, causes cysts.

Question 3

How do you develop cystercersosis

Answer 3

eating T. Solium eggs from human feces, causes cysts.

Question 4

Taenia saginata

Answer 4

(Cow Tapworm) -Eating undercooked beef, asymptomatic/ vague abdominal pains, Worm exists inside host NO CYSTs.

Question 5

Diphyllobothrium latum

Answer 5

FISH TAPEWORM -Ingestion of Raw of pickled fish, eating gefilite fish - asymptomatic/ abdominal pain with cramping N/V weight loss. -40% have low victamin b12. -Sparganosis- ingesting the larva forms of D. Latum from cold lakes, eating raw tadpoles, frogs, snakes. -Causes SubQ painful Inflammation and Pain in the eye, periorbital edema, orneal ulcers. (Surgical removal necessary)

Question 6

How do you develop sparganosis

Answer 6

ingesting the larva forms of D. Latum from cold lakes, eating raw tadpoles, frogs, snakes.

Question 7

Echinococcus granulosus

Answer 7

[hydatid cyst] - Resides in the bowl of its definite host, ie sheep, swine, cattle, and carnivores, NOT HUMANS, -eggs are passed in feces, can release oncospheres in humans, forms hydatid cysts - produce protoscolices and daughter cysts that fill the cyst interior. Human infection follows ingestion of contaminated water or vegetation, as well as hand-to-mouth transmission of canine feces carrying the infective eggs. -Slow growing. -Pressure from cyst is first sign. -HIGH risk of anaphylaxis with aspiration. -Add formalin.

Question 8

Echinococcus multilocularis

Answer 8

-primarily found in foxes, wolves, dogs, and cats. -Intermediate host in mice, valves, shrews, lemmings. -Humans get infected with contract with fox, dogs, cat feces. -High risk occupation: trappers. -Cysts, Usually infects the liver and lungs, sometimes the brain. -Can MIMIC carcinoma, S/s liver enlargement, biliary obstruction. -Untreated mortality 70 %, -Requires surgical removal. -Metastasis to lung and brain common.

Question 9

Hymenolepis nana

Answer 9

(dwarf tapeworm) - very small, does not require an intermediate host -associated with mice and beetles -Eggs hatch in intestine and grow to adults without leaving host (Autoinfection). -Cysctercoid larva. -Ingestion of contaminated grain, and flour. -High rick to children/ day care centers. -S/s diarrhea, ab pain, headache, anorexia, complaints may be vague. -Rodent control

Question 10

Hymenolepis diminuta

Answer 10

-primarily a tapeworm of rats and mice, can be found in humans -Different that H. Nana because of its size and scolex lacks hooklets and has no polar filaments. -Requires insect for development. -From contaminated grain, with rat feces. -Asymptomatic/N/D ab pain, anorexia. -Rodent control

Question 11

Dipylidium caninum

Answer 11

-Parasite of dogs and cats -larval worms from dog and cat fleas -eggs reside in packets of 8-15 six hooked oncospheres -Human infection from dog licking mouth of person or direct swallowing of fleas. -S/s ab pain, anal itching, and diarrhea. -Visible proglottids in feces. -Deworm dogs and cats

Question 12

Identify A