Lecture 2: Cestodes Flashcards Preview

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Flashcards in Lecture 2: Cestodes Deck (60):
1

cestodes are

tapeworms

2

phylum for tapeworms

platyhelminthes "flatworms" which includes trematodes "flukes" and cestodes "tapeworms"

3

Class Cestoda includes Orders

Cyclophyllidea "true tapeworms" like Dipylidium caninum
Pseudophyllidea "psuedotapeworms" like Spirometra mansonides

4

morphological recap of cyclophyllidean tapeworms

hermaphroditic (like most flukes)
always endoparasitic
adults lack digestive tract, but have muscular system to move
scolex (head) contains four suckers/acetabula
armed or unarmed (hooks)
germinal neck and body (strobila) with segments (proglottids)
more mature proglottids are farther from scolex
each proglottid contains excretory system, nervous system and is hermaphroditic

5

cyclophyllidean tapes only have a __ pore

genital

hermaphroditic

6

pseudophyllidean tapes have a __ and __ pore but are still hermaphroditic

uterine and male genital pore

7

cucumber seed tapeworm

diphylidium caninum

8

distribution of dipylidium caninum

worldwide

9

DH of diphylidium caninum

dogs, cats, humans

10

IH for dipylidium caninum

fleas (ctenocephalides felis, c. canis, pulex irritans) and dog lous (trichodectes canis)

11

juvi tapeworm is called a

cysticercoid (metacestode), each is one adult/one scolex

12

diphylidium caninum reproductive system

2 sets of reproductive organs / proglottid and genital pores on the lateral aspects of proglotids

13

scolex of diphylidium caninum

4 circular suckers/acetabulum
ARMED (hooks)

14

eggs of dipylidium caninum

packets with up to 65eggs/packet
6 hooked hexacanth embryos inside eggs

will need to smash up proglottid to get egg packets

15

proglottids of dipylidium caninum can be found

in feces, in pet beds, in fur around anus
look like cucumber seeds

16

LC of dipylidium caninum

proglottids shed in feces
rupture and release egg packets
eggs ingested by IH (flea or louse larvae)
hexacanth embryo mature to cysticercoid inside adult flea w/in 36hr when it is on the DH (temperature triggers)
flea is ingested by DH, scolex attaches to SI

17

what is unique about the d. caninum LC

Embryo matures to cysticercoid once flea is on the DH!

18

treatment for d. caninum

can be difficult or easy
must control fleas/lice
treat tapes with praziquantel, fenbendazole once IH is gone

19

taeniid type tapeworms

long rectangular proglottids
large worms
usually ARMED
single genital pore per proglottid (d. caninum has 2 genital pores)
unique eggs but can't tell which taeniid spp by looking at eggs

20

general taeniid LC

Adults in SI of DH
proglottids passed in feces
IH ingests eggs (hexacanth embryo) released and penetrates intestinal mucosa to enter circulation
metacestode stage developes in various organs/tissues
DH ingests raw meat with metacestodes

21

mutton tapeworm

taenia ovis

22

DH taenia ovis

SI of dog

23

metacestode of Taenia ovis

skeletal and cardiac muscle of sheep and goats (masseter, heart, diaphragm)

24

ruminant tapeworm of dogs or abdominal bladderworm

taenia hydatigena

25

adult taenia hydatigena

SI of dogs

26

metacestode of taenia hydatigena

peritoneal cavity of sheep and goats (serosal surfaces of abdominal organs and liver)

27

rabbit tapeworm or abdominal bladderowrm

taenia pisiformis

28

metacestode of taenia pisiformis

peritoneal cavity of rabbits (serosal surfaces of abdominal organs)

29

feline taeniid or strobilocercus of rats

taenia taeniaeformis

30

adult taenia taeniaeformis

SI of felids

31

metacestode of taenia taeniaeformis

liver of rats and mice

32

metacestode is a __ in case of taenia taeniaeformis vs other dog taenia discussed were ___

strobilocercus (single non-invaginated scolex attached to bladder)
cysticercus (single invaginated scolex "inside out scolex" )

33

this taeniae tapeworm is found in SI of dogs and the metacestode stage is a unilocular hydatid cyst

echinococcus granulosus

short tapeworm, metacestode stage contains a large bladder filled with hundreds of scolices that acts as a brood capsule and is also termed to look like 'hydatid sand" (unilocular hydatid cyst)

34

which taeniid has zoonotic potential

echinococcus granulosus

be cautious with all taeniids bc the eggs all look alike

35

echinococcus granulosus metacestode stage is found

liver, lung, brain of cattle, sheep, horses, pigs, humans (unilocular hydatid cyst) - can try to sx remove depending on location

36

scary tiny tapeworm that makes a thin multilocular hydatid cyst

echinococcus multilocularis

37

metacestode stages of echinococcus multilocularis are found in what animals

rodents and humans (liver, lungs, brain, other)

38

contains thousands of brood capsules each containing hundreds of protoscolices

multilocular hydatid cyst of echinococcus multilocularis tapeworm

39

sheep coenurus tapeworm or gid bladderworm

taenia multiceps

40

taenia multiceps metacestode is found where

brain/SC of sheep and goats. Metacestode is a coenurus (large fluid filled bladder with several hundred scolices)

41

rabbit coenurus tapeworm or subcutaneous bladderworm

taenia serialis

42

taenia serialis is metacestode is found where

SC and IM c.t. of the RABBIT, metacestode is a coenurus (fluid filled bladder with hundreds of scolices lined up into rows

43

what is different from the coenurus of taenia serialis vs. taenia multiceps

scolices line up in rows

44

which Taeniid tapeworms have 1 adult metacestode types

T. ovis, hydatigena, pisiformis (cysticercus metacestode)
T. taeniaeformis (strobilocercus metacestode)

45

which Taeniid tapeworms have thousands of adults in metacestode type

echinococcus granulosum (unilocular hydatid cyst) and multilocularis (multilocular hydatid cyst)

46

which taeniid tapeworm metacestode types have hundreds of adults

taenia multiceps and serialis (coenurus)

47

diagnosing taeniid tapeworms

fecal float
high specific gravity
adult

48

treatment options for taeniid tapeworms

praziquantel
fenbendazole

49

spirometra mansonoides

pseudophyllidean tapeworm of dogs, cats, and raccoons
zoonotic

50

one set of reproductive organs, uterine pores, and scolex with 2 bothria

spirometra mansonoides
will see black dots down middle

51

stages of spirometra mansonoides

operculated eggs
ciliated coracidium
metacestode stages:
procercoid in 1IH copepod (
Plerocercoid in 2IH (frog, rat, snake, NOT a fish)

52

Life cycle of spirometra mansonoides

adults in SI cat/dog
eggs passed in feces via uterine pore (operculated)
copepod eats coracidium
procercoid in copepod is eaten by frog, rate, stank
plerocercoid or sparganum encysts in muscels of 2IH and is eaten by DH

53

plerocercoid that is encysted

sparganum (ie frog legs with sparganum cysts = pseudo tapeworms)

54

is spirometra mansonoides zoonotic

yes, humans can eat infected copepod or if meat uses as a poultice (wtf, just don't do that)

55

the broad fish tapeworm

diphyllobothrium latum

56

DH of diphyllobothrium latum

SI dogs, cats, polar bears, humans... fish eating mammals

57

IH of diphyllobothrium latum

1IH copepod (like spirometra)
2IH freshwater fish (unlike spirometra)

58

is diphyllobothrium latum zoonotic?

yes
may see vitamin B12 deficiency

59

2 types of pseudophyllidean tapeworms discussed

spirometra mansonoides
diphyllobothrium latum

60

cyclophyllidean tapeworms discussed (true tapes)

dipylidium caninum
taeniid types (taenia and echinococcus)