7. ID
• Taenia species
• The proglottids were immature and could not
be speciated.
• Need to obtain mature proglottids or a scolex
8. Taeniasis
• Taenia solium (pork), Taenia saginata (beef),
and Taenia asiatica (asian pork)
• Saginata and asiatica very similar and have
humans as the only definitive host with adult
living in GI tract.
• Taenia solium may be definitive or
intermediate host in humans.
9. Taenia species
• Behind the scolex is a short skinny neck in
which further proglottids (segments) are
formed. The elongating chain of proglottids
called strobila.
10. Taenia species
• Mature proglottids are hermaphroditic and
produce eggs.
• Eggs from all taenia species are identical
Thick brown
striated shell
oncosphere
11. Life cycle
• Ingestion of eggs or proglottids by
intermediate host
• Larval oncospheres are activated, egg escapes
• Penetrates the intestinal mucosa
• Migrates to tissue and develops a cysticercus
(single scolex)
• Ingestion by definitive host
• Scolex develops into adult tapeworm
12.
13. Taenia species
• Clinical presentation: usually patients become
aware with passage of proglottids. Mild
abdominal pain/discomfort, nausea, Change
in appetite, weakness, weight loss.
14. Taenia species
• Diagnosis: detection of eggs or proglottids in
stool ( or cellophane tape test), eosinophilia
or elevated IgE may be detected.
• Treatment: Praziquantel 10 mg/kg one time
dose
• Prevention: cook meat (cuts) to 145 C with a
three minute rest period and (ground) to 160
C
15. Cysticercosis/neurocysticercosis
• Larval forms (Taenia solium) in the tissue of humans.
• From ingestion of T. solium eggs usually
autoinfection or from close contact with a tape
worm carrier.
• Presents as seizures, HA, increased ICP, change in
vision, dizziness, ataxia, or confusion.
• Praziquantel occasionally causes an inflammatory
response in the CNS
• Need close monitoring and high dose glucocorticoids
