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Cercaria (Schistosoma mansoni)

Schistosomiasis

Liver damage, malnutrition, weakness, and accumulation of fluid in the abdominal cavity

Cercaria of birds and other animals

Swimmer's itch

Inflammation of the skin, itching

(c) Inadequately cooked pork containing cysticerci ingested

(c) Inadequately cooked pork containing cysticerci ingested

(b) Cysticercus develops in flesh of pig

(a) Pig ingests embryonated ovum from human feces

Figure 12.24 (a-e) Life Cycle of the Pork Tapeworm, Taenia solium, Acquired by Eating Inadequately Cooked Pork If worm ova hatch in the intestine, larval forms called cysticerci can develop throughout the person's tissues.A cysticercus in the brain can cause epilepsy.

(b) Cysticercus develops in flesh of pig

(a) Pig ingests embryonated ovum from human feces

Figure 12.24 (a-e) Life Cycle of the Pork Tapeworm, Taenia solium, Acquired by Eating Inadequately Cooked Pork If worm ova hatch in the intestine, larval forms called cysticerci can develop throughout the person's tissues.A cysticercus in the brain can cause epilepsy.

100 mm

Figure 12.25 Schistosoma mansoni Cercaria The form that penetrates the skin and initiates the infection.Water bird schistosomes may penetrate the skin of swimmers and then die, causing swimmers itch.

100 mm

Figure 12.25 Schistosoma mansoni Cercaria The form that penetrates the skin and initiates the infection.Water bird schistosomes may penetrate the skin of swimmers and then die, causing swimmers itch.

Future Challenges 319

developing within the egg. These larvae escape into the environment, where they are taken up by one or more intermediate hosts such as a snail. Eventually, the last stage is a tail-bearing larva known as a cercaria, which is released from the snail and is ready to attach to the susceptible host (figure 12.25). For example, if a human is wading in water and the cercaria of Schistosoma mansoni have been discharged into that water, the cercaria can penetrate the skin and work its way through the circulation to the liver and intestine, where it matures and lays eggs.

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