cestodes Flashcards
tapeworms are part of
platyhelminths
tapeworm- general
hermaphroditic
-absorb nutrients thru their body- have no mouth or digestive
-big as 20 meters
-1 per person
anterior end of tapeworm called
scolex
-4 attachment suckets
-may also have hooks
entire body of tapeworm called
strobila
each segment of tapeworm called
proglottid
proglottid has what parts
male and female
worms grow by
adding proglottid
pregnant (gravid) may contain
fertilized eggs
embryo within egg may have
6 tiny hooklets that can hook to host intestinal wall
known as beef tapeworm
taenia saginata
how to get Taenia saginata
cows may eat eggs or shed proglottids found in soil
-we eat cows
can not differentiate Taenia saginata from egg need to look at
worm and proglottids
features of worm specific to Taenia saginata
head of worm “unarmed”- no hooks at head
15-30 branches/proglottid
when humans ingest raw or undercooked meat the
scholex will attach to wall of small intestine and mature into adult tapeworm in 10 weeks
-adding more proglottids
diagnostic stage of Taenia saginata
egg, scolex, or proglottids in stool
known as pig worm
taenia solium
how to differentiate solium
look at worm and proglottids
characteristics of worm for taenia solium
head is armed- have hooklets
7-12 uterine branches
diagnostic stage for solium
egg, scolex, or proglottids in the stool
known as broad fish or fish tapeworm
Diphyllobothrium latum
where is Diphyllobothrium latum found
temperate regions of world where freshwater fish are natural diet
-scandinavian countries
also sushi
-great lakes !!
for Diphyllobothrium latum what helps identify it
egg
-operculated; cross between paragonimus and clonorchis
to prevent Diphyllobothrium latum
freeze fish for 48 hours or properly cook for it to be killed
symptoms of Diphyllobothrium latum
vague abdominal pain, weight loss, weakness
what do people with Diphyllobothrium latum develop
severe macrocytic type of anemia
use 100% of person’s vitamin B12
