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Flashcards in Cestodes Deck (43):
0

Cestodes are a type of _______ (members of platyhelminth)

Flatworms

1

Cestodes can have a scolex (head) with suckers, some with hooklets ("armed"); ________ (segments) can be diagnostic for some

Proglottids

2

An entire chain of proglottids

Strobila

3

What portion of cestodes are passed in the stool?

Eggs or proglottids

4

What is the most common tapeworm in the US?

Hymenolepis nana

5

Hymenolepis nana:
- common name

Dwarf tapeworm

6

Hymenolepis nana:
- most common in what age group of people

More common in children

7

Hymenolepis nana:
- intermediate host

No intermediate host or may have arthropod intermediate (flea or beetle)

8

Hymenolepis nana:
- how is it spread

Fecal oral route, or by ingestion of infected arthropod

9

Hymenolepis nana:
- major clinical manifestation

Usually asymptomatic

10

Hymenolepis nana:
-microscopic appearance of egg

Thin shelled egg in stool with hexacanth embryo, polar thickenings and filaments

11

Hymenolepis nana:
- adult's appearance

Small, tiny armed scolex, hooklets

12

Hymenolepis diminuta:
- common name

Rat tapeworm

13

Hymenolepis diminuta:
- intermediate host

Rat is definitive host, humans ingest infected arthropod (meal beetles, fleas)

14

Hymenolepis diminuta:
- microscopic egg appearance

Eggs found in stool, hexacanth embryo with no polar filaments; eggs are larger and thicker shelled then E. nana

15

Diphyllobothrium latum:
- common name

Broad fish tapeworm

16

Diphyllobothrium latum:
- where is it found?

Temperate zones (even Scandinavia) found in U.S. (northern Midwest lakes)

17

Diphyllobothrium latum:
- intermediate host

To intermediates: copepod and freshwater fish

18

Diphyllobothrium latum:
- claim to fame

Only operculate tapeworm found in man

19

Diphyllobothrium latum:
- most important clinical manifestation

Megaloblastic anemia (competition for B12)

20

Diphyllobothrium latum:
- microscopic appearance of eggs

Eggs or proglottids passed in the stool; eggs are operculate, shoulders, aboperculate knob

21

Diphyllobothrium latum:
- proglottid appearance

Proglottids are broader than long (often chain of proglottids past)

22

Taenia saginata:
- common name

Beef tapeworm

23

Taenia saginata:
- intermediate host

Cattle

24

Taenia saginata:
- where is it found

Worldwide but rare in the US

25

Taenia saginata:
- clinical manifestations

Vague GI symptoms

26

Taenia saginata:
- microscopic egg appearance

Striated shell, hexacanth embryo (can't differentiate from T. solium)

27

Taenia saginata:
- proglottid appearance

Proglottids are longer than wide (15 to 20 uterine branches)

28

Taenia solium:
- common name

Pork tapeworm

29

Taenia solium:
- intermediate host

Pig

30

Taenia solium:
- what are the two types of infections

- Larvae infection- intestinal
- Egg ingestion Cysticercosis (very serious)

31

Cysticercosis:
- cysticerci ("_______ worm"): larvae in fluid filled _______

Bladder

32

What is the number one cause of adult onset epilepsy in endemic areas

Cysticercosis (cysticerci can locate in brain, eye, muscle; headaches, seizures, psychiatric disturbances can result)

33

Taenia solium:
- microscopic appearance of eggs

Eggs can't be differentiated from T. saginata

34

Taenia solium:
- proglottid appearance

Similar to T. saginata except 7 to 13 uterine branches

35

Echinococcus granulosus:
- common name

Canine tapeworm

36

Echinococcus granulosus:
- what disease does it cause

Hydatid Cyst Disease (cystic disease)

37

Echinococcus granulosus:
- intermediate host

Sheep/sheep dogs (occur often in sheep grazing countries, including U.S.)

38

Echinococcus granulosus:
- diagnosis

Cysts grow in liver, lungs, brain;
- aspirate fluid from the cyst; cyst will contain numerous scolices and hooklets ("hydatid sand")

39

Dipylidium caninum:
- common name

Dog tapeworm

40

Dipylidium caninum:
- how is it spread

Children accidentally ingested dog fleas with tapeworm (usually asymptomatic)

41

Dipylidium caninum:
- egg appearance

Egg packets (numerous hexacanth embryo)

42

Dipylidium caninum:
- proglottids appearance

Resemble cucumber seeds or rice grains