CDC Taeniasis

Taenia asiatica] [Taenia saginata] [Taenia solium]

days to months

Taeniasis

(1) the eggs can survive for ______ in the environment. Cattle (T. saginata) and pigs (T. solium and T. asiatica) become infected by ingesting vegetation contaminated with eggs or gravid proglottids

definitive hosts

Taeniasis is the infection of humans with the adult tapeworm of Taenia saginata, T. solium or T. asiatica.
Humans are the only ________ for these three species. Eggs or gravid proglottids are passed with feces

ingesting vegetation

become infected by_________ contaminated with eggs or gravid proglottids

oncospheres

(2) In the animal’s intestine, the _________ hatch

Gravid proglottids

The mature, egg-filled segments of a tapeworm, found at the end of the worm's body, that detach and pass in feces (or emerge from the anus), spreading infectious eggs to contaminate the environment for other hosts

intestinal wall,striated muscles

(3) invade the_________ , and migrate to the ______, where they develop into cysticerci.

cysticercus

Can survive for several years in the animal.

undercooked infected meat

Humans become infected by taeniasis by ingesting raw or __________

2 months, scolex small intestine

(4) In the human intestine, the cysticercus develops over _____ into an adult tapeworm, which can survive for years. The adult tapeworms attach to the small intestine by their __________.

small intestine

(5) and reside in the_______

5 m or less

(6) Length of adult worms is usually __for T. saginata (however it may reach up to 25 m) and 2 to 7 m for T.solium.

2 to 7 m

Length of T.solium

1,000 to 2,000

The adults produce proglottids which mature, become gravid, detach from the tapeworm, and migrate to the anus or are passed in the stool (approximately 6 per day). T. saginata adults usually have _____ proglottids

1,000

T. solium adults have an average of ________ proglottids.

proglottids are passed with the
feces

The eggs contained in the gravid proglottids are released after the__________ .

100,000

T. saginata may produce up ________to and T. solium may produce 50,000 eggs per proglottid respectively

poorer communities

Taenia saginata and T. solium are worldwide in distribution. Taenia solium is more prevalent in ______ where humans live in close contact with pigs and eat undercooked pork.

Asia

Taenia asiatica is limited to ________ and is seen mostly in the Republic of Korea, China, Taiwan, Indonesia, and Thailand

Eggs or gravid proglottids in feces

and passed into environment

(1)

Cattle (T. saginata) and pigs (T. solium)

become infected by ingesting vegetation

contaminated by eggs or gravid proglottids

(2)

Oncospheres hatch, penetrate intestinal wall, and circulate to musculature

(3)

Oncospheres develop

into cysticerci in muscle

infective stage

Humans infected by ingesting

raw or undercooked infected meat

(4)

T. saginata

T. solium

Scolex attaches to intestine

(5)

Adults in small intestine

(6)

mild abdominal symptoms

Taenia saginata taeniasis produces only _______________. The most striking feature consists of the passage (active and passive) of proglottids.

appendicitis or cholangitis

Occasionally, __________ can result from migrating proglottids.

Taenia solium than Taenia saginata

____________ taeniasis is less frequently symptomatic than _________ taeniasis. The main symptom is often the passage (passive) of proglottids.

cysticercosis

The most important feature of Taenia solium taeniasis is the risk of development of _________