Parasitology Cestodes (Tapeworms)

Front 1

Cestodes are commonly referred to as ________.

Back 1

Tapeworms

-Flat, ribbon-like, segmented worms

Front 2

Cestodes have ___ number of cup shaped suckers on scolex?

Back 2

4 (except Diphyllobothrium latum which has 2 suctorial grooves)

Front 3

Cestodes require a _________ host?

Back 3

Intermediate

Front 4

Proglottids contain both _____ and _____ reproductive organs.

Back 4

mature proglottids contain both male and female reproductive organs = hermaphroditic.

Front 5

The parasites considered to be cestodes are:

Back 5

-Taenia saginata (Beef tapeworm)
-Taenia solium (Pork Tapeworm)
-Hymenolepis nana (Dwarf Tapeworm)
-Hymenolepsis diminuta (Rat Tapeworm)
-Diphyliobothrium latum (Broad fish tapeworm)
-Echinococcus granulosus (Hydatid Tapeworm)
-Dipylidium caninum (Dog tapeworm)

Front 6

Taenia saginata has a scolex with an _________ rostellum?

Back 6

unarmed

Front 7

Diagnostic stage of Taenia saginata:

Back 7

-characteristic egg in feces
-proglottids with 15-30 uterine branches

Front 8

THe proglottids of T. saginata have _____ number of major uterine branches?

Back 8

15-30 uterine branches

Front 9

Infection with T. saginata is caused by:

Back 9

Ingestion of undercooked beef containing larval stage

Front 10

Taenia solium scolex has a _____ rostellum?

Back 10

Armed

Front 11

Cysticercosis is caused by which cestode?

Back 11

Taenia solium

-parasite causing this serious condition must be ARMED.

-found in connective tissue, eye, brain, muscles, heart, lung.

Front 12

Humans are the _____ host with T. solium?

Back 12

intermediate

-Man ingests egg of T. solium
-Egg passes through stomach & hatches in intestine.
-Penetrates mucosa and becomes cysticercus.

Front 13

The proglottid of T. solium contains ____ major uterine branches?

Back 13

7-13 major uterine branches

less letters = less uterine branches

Front 14

Infective stage of T. solium in cysticercosis?

Back 14

Egg

Man is intermediate hose

Front 15

The most common human tapeworm in the U.S.?

Back 15

Hymenolepsis nana (Dwarf Tapeworm)

-small tapeworm (40mm long)
-does not require intermediate host (may have intermediate host such as flea or beetle)

Front 16

Hymenolepsis nana has a _______ rostellum?

Back 16

Armed with hooks

Front 17

The infective stage of H. nana is ________

Back 17

Ingestion of eggs

eggs have polar filament

Front 18

Hymenolepsis diminuta has ____ as the definitive host?

Back 18

rat

-man is accidental host via ingestion of infected intermediate arthropod host (grain bettles in pre-cooked cereal)

Front 19

The infective stage of H. dimunuta?

Back 19

Ingestion of flea

Front 20

Hymenolepsis diminuta eggs look similar to H. nana but they _____ polar filaments.

Back 20

Lack

Front 21

Diphyllobothrium latum scolex consists of _____ longitudinal suctorial grooves (bothria)=spoon shape

Back 21

2

Front 22

Cestode in which uterus in gravid proglottid appears as a rosette?

Back 22

Diphyllobothrium latum

-May have as many as 3000 proglottids

Front 23

Parasite that causes megaloblastic anemia?

Back 23

Diphyllobothrium latum

worm absorbs vitamin B12

Front 24

Infective stage of D. latum?

Back 24

Ingestion of larvae in infected undercooked freshwater fish

Front 25

Diagnostic stage of D. latum?

Back 25

Eggs or proglottids in feces

may not be seen in floation techniques=operculated eggs sink!

Front 26

ONLY cestode to produce operculated eggs?

Back 26

Diphyllobothrium latum

*Egg has small abopercular knob*

Front 27

A disease caused by drinking water containing infected copepod?

Back 27

Sparganosis

larvae develops in human who is the intermediate host instead of the fish

Front 28

Intermediate hose of D. latum?

Back 28

Freshwater fish

Front 29

The intermediate host of Echinococcus granulosus?

Back 29

Sheep

ingest eggs

Front 30

The definitive host of Echinocccus granulosus?

Back 30

Dogs

infected from eating viscera of butchered animals

Front 31

The infective stage of Echinococcus granulosus?

Back 31

Man ingests egg (intermediate host)

Front 32

Adult Echinocuccus granulosus are _____ cm long.

Back 32

3-6 cm long

Front 33

The scolex of E. granulosus has an ______ rostellum.

Back 33

Armed

Front 34

Diagnostic stage of Echinococcus granulosus is ________.

Back 34

1. Hydatid cysts seen in x-rays or exploratory surgery.

-forms in liver, lungs, brain, and heart.

2. Serological tests (ELISA)

Front 35

Diphylidium caninum diagnostic stage demonstrates _________ in feces.

Back 35

Egg packet (5-30 eggs are in a hylaline non-cellular egg sac)

found predominantly in children

Front 36

Diphylidium caninum normal life cycle?

Back 36

Cats & Dogs ingest infected fleas containing larvae

Front 37

The infective stage of Diphlidium caninum?

Back 37

human (accidental intermediate host)ingests infected flea

Front 38

Proglottids resemble pumpkin/cucumber seeds when moist and rice grains when dry:

Back 38

Diphlidium caninum

Front 39

Disease in which man ingests egg of E. granulosus & becomes intermediate host:

Back 39

Hydatid disease