Flashcards in Helminths (complete) Deck (101)
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31
does the scolex of taenia sanginita have hooks
nope
32
what happens to the proglottids of taenia sanginitia
they are relesed into feces, then the eggs develop into onchospheres, which leave animal intestines and encyst into animal tissues. They develop there into cysticerci, which are ingested, then develop into adult worms
33
What is the treatment for taenia sanginata
niclosamide or PTZ
34
Can humans become the intermediate host of taenia solium
yes, but this is rare because the cysticerci develop in the human muscle, but this is a dead end for the taenia solium because the human tissue doesn't get eaten
35
can cysticerci in humans be pathogenic
yep, it can develop in the eye, CNS, and the heart
36
What can cysticerci in the CNS (neurocysticerosis) cause
epilepsy, meningitis, and encephalitis
37
how can neurocysticerosis be diagnosed
biopsy, CAT scan, MRI, look for subcutaneous cysticericosis first
38
how are cysticercosis treated
phenothiazine (PTZ)
corticosteroids
surgery
39
What are echinococcus granulosus
tapeworms of canines
40
how many proglottids do echinococcus granulosus have
3, one immature, one mature, and one gravid (each time the neck forms a new proglottid the gravid one falls off)
41
how are canines infected by echinococcus granulosus
by eating cysticerci in various herbivore hosts
42
what happens to humans with echinococcus granulosus
they can become accidental intermediate hosts if they ingest something contaminated with dog feces. they get Hydatid Disease
43
What is hydatid disease
an infection of echinococcus granulosus cysticerci. those cysticerci can grow and form hydatid cysts, this can cause tissue disfunction and if there are large numbers, death
44
What are trematodes
flukes, flat and leaf-shaped worms
45
what are the suckers like on trematodes
there are oral and ventral suckers that allow for attachment and nutrient obtaining
46
are trematodes dioecious or monoecious
they can be either
47
What is the most important trematode infector of humans
Schistosoma
48
how does a human infection of Schistosoma occur
motile cercariae in contanimated fresh water penetrate intact skin with the proteases stored in their head. Then they lose their tails and migrate via the circulation to the liver
49
where do Schistosoma mature
in the liver
50
do Schistosoma multiply in the host
nope, they do release eggs however
51
what do the eggs of Schistosoma elicit from the immune system
a granulomatous inflammatory response
52
What is another name for schistosoma
blood flukes
53
are blood flukes dioecious or monoecious
dioecious
54
What disease do blood flukes cause
schistosomiasis
55
What are the three species of Schistosoma
Schistosoma mansonii
Schistosoma haemotobium
Schistosoma Japonicum
56
does anything occur where a cercariae enters the skin
sometimes dermatitis
57
how serious can blood flukes be
they can become chronic and fatal
58
how do you prevent blood flukes
improved sanitation and avoiding contact with contaminated water
59
how do Schistosoma worms evade the immune system
by absorbing host complement regulatory proteins onto their surface
60
