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eFigure 37–27. Life cycle of cestodes. Taeniasis is the infection of humans with the adult tapeworm of Taenia saginata, Taenia solium, or T asiatica. Humans are the only definitive hosts for these three species. Eggs or gravid proglottids are passed with feces ; the eggs can survive for days to months in the environment. Cattle (T saginata) and pigs (T solium and T asiatica) become infected by ingesting vegetation contaminated with eggs or gravid proglottids . In the animal’s intestine, the oncospheres hatch , invade the intestinal wall, and migrate to the striated muscles, where they develop into cysticerci. A cysticercus can survive for several years in the animal. Humans become infected by ingesting raw or undercooked infected meat . In the human intestine, the cysticercus develops over 2 months into an adult tapeworm, which can survive for years. The adult tapeworms attach to the small intestine by their scolex and reside in the small intestine . Length of adult worms is usually 5 M or less for T saginata (however, it may reach up to 25 M) and 2–7 M for T solium. 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 1000 to 2000 proglottids, while T solium adults have an average of 1000 proglottids. The eggs contained in the gravid proglottids are released after the proglottids are passed with the feces. T saginata may produce up to 100,000, and T solium may produce 50,000 eggs per proglottid respectively. (From Global Health, Division of Parasitic Diseases and Malaria, CDC.) A flowchart of the life cycle of Taeniasis species.

Current Medical Diagnosis & Treatment 2024 > Noninvasive Cestode Infections

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eFigure 37–27. Life cycle of cestodes. Taeniasis is the infection of humans with the adult tapeworm of Taenia saginata, Taenia solium, or T asiatica. Humans are the only definitive hosts for these three species. Eggs or gravid proglottids are passed with feces ; the eggs can survive for days to months in the environment. Cattle (T saginata) and pigs (T solium and T asiatica) become infected by ingesting vegetation contaminated with eggs or gravid proglottids . In the animal’s intestine, the oncospheres hatch , invade the intestinal wall, and migrate to the striated muscles, where they develop into cysticerci. A cysticercus can survive for several years in the animal. Humans become infected by ingesting raw or undercooked infected meat . In the human intestine, the cysticercus develops over 2 months into an adult tapeworm, which can survive for years. The adult tapeworms attach to the small intestine by their scolex and reside in the small intestine . Length of adult worms is usually 5 M or less for T saginata (however, it may reach up to 25 M) and 2–7 M for T solium. 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 1000 to 2000 proglottids, while T solium adults have an average of 1000 proglottids. The eggs contained in the gravid proglottids are released after the proglottids are passed with the feces. T saginata may produce up to 100,000, and T solium may produce 50,000 eggs per proglottid respectively. (From Global Health, Division of Parasitic Diseases and Malaria, CDC.) A flowchart of the life cycle of Taeniasis species.

Current Medical Diagnosis & Treatment 2024 > Noninvasive Cestode Infections

View in Context

eFigure 37–27. Life cycle of cestodes. Taeniasis is the infection of humans with the adult tapeworm of Taenia saginata, Taenia solium, or T asiatica. Humans are the only definitive hosts for these three species. Eggs or gravid proglottids are passed with feces ; the eggs can survive for days to months in the environment. Cattle (T saginata) and pigs (T solium and T asiatica) become infected by ingesting vegetation contaminated with eggs or gravid proglottids . In the animal’s intestine, the oncospheres hatch , invade the intestinal wall, and migrate to the striated muscles, where they develop into cysticerci. A cysticercus can survive for several years in the animal. Humans become infected by ingesting raw or undercooked infected meat . In the human intestine, the cysticercus develops over 2 months into an adult tapeworm, which can survive for years. The adult tapeworms attach to the small intestine by their scolex and reside in the small intestine . Length of adult worms is usually 5 M or less for T saginata (however, it may reach up to 25 M) and 2–7 M for T solium. 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 1000 to 2000 proglottids, while T solium adults have an average of 1000 proglottids. The eggs contained in the gravid proglottids are released after the proglottids are passed with the feces. T saginata may produce up to 100,000, and T solium may produce 50,000 eggs per proglottid respectively. (From Global Health, Division of Parasitic Diseases and Malaria, CDC.) A flowchart of the life cycle of Taeniasis species.

Current Medical Diagnosis & Treatment 2024 > Noninvasive Cestode Infections

View in Context

eFigure 37–27. Life cycle of cestodes. Taeniasis is the infection of humans with the adult tapeworm of Taenia saginata, Taenia solium, or T asiatica. Humans are the only definitive hosts for these three species. Eggs or gravid proglottids are passed with feces ; the eggs can survive for days to months in the environment. Cattle (T saginata) and pigs (T solium and T asiatica) become infected by ingesting vegetation contaminated with eggs or gravid proglottids . In the animal’s intestine, the oncospheres hatch , invade the intestinal wall, and migrate to the striated muscles, where they develop into cysticerci. A cysticercus can survive for several years in the animal. Humans become infected by ingesting raw or undercooked infected meat . In the human intestine, the cysticercus develops over 2 months into an adult tapeworm, which can survive for years. The adult tapeworms attach to the small intestine by their scolex and reside in the small intestine . Length of adult worms is usually 5 M or less for T saginata (however, it may reach up to 25 M) and 2–7 M for T solium. 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 1000 to 2000 proglottids, while T solium adults have an average of 1000 proglottids. The eggs contained in the gravid proglottids are released after the proglottids are passed with the feces. T saginata may produce up to 100,000, and T solium may produce 50,000 eggs per proglottid respectively. (From Global Health, Division of Parasitic Diseases and Malaria, CDC.) A flowchart of the life cycle of Taeniasis species.

Current Medical Diagnosis & Treatment 2024 > Noninvasive Cestode Infections

View in Context

eFigure 37–27. Life cycle of cestodes. Taeniasis is the infection of humans with the adult tapeworm of Taenia saginata, Taenia solium, or T asiatica. Humans are the only definitive hosts for these three species. Eggs or gravid proglottids are passed with feces ; the eggs can survive for days to months in the environment. Cattle (T saginata) and pigs (T solium and T asiatica) become infected by ingesting vegetation contaminated with eggs or gravid proglottids . In the animal’s intestine, the oncospheres hatch , invade the intestinal wall, and migrate to the striated muscles, where they develop into cysticerci. A cysticercus can survive for several years in the animal. Humans become infected by ingesting raw or undercooked infected meat . In the human intestine, the cysticercus develops over 2 months into an adult tapeworm, which can survive for years. The adult tapeworms attach to the small intestine by their scolex and reside in the small intestine . Length of adult worms is usually 5 M or less for T saginata (however, it may reach up to 25 M) and 2–7 M for T solium. 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 1000 to 2000 proglottids, while T solium adults have an average of 1000 proglottids. The eggs contained in the gravid proglottids are released after the proglottids are passed with the feces. T saginata may produce up to 100,000, and T solium may produce 50,000 eggs per proglottid respectively. (From Global Health, Division of Parasitic Diseases and Malaria, CDC.) A flowchart of the life cycle of Taeniasis species.

Current Medical Diagnosis & Treatment 2024 > Noninvasive Cestode Infections

View in Context

eFigure 37–27. Life cycle of cestodes. Taeniasis is the infection of humans with the adult tapeworm of Taenia saginata, Taenia solium, or T asiatica. Humans are the only definitive hosts for these three species. Eggs or gravid proglottids are passed with feces ; the eggs can survive for days to months in the environment. Cattle (T saginata) and pigs (T solium and T asiatica) become infected by ingesting vegetation contaminated with eggs or gravid proglottids . In the animal’s intestine, the oncospheres hatch , invade the intestinal wall, and migrate to the striated muscles, where they develop into cysticerci. A cysticercus can survive for several years in the animal. Humans become infected by ingesting raw or undercooked infected meat . In the human intestine, the cysticercus develops over 2 months into an adult tapeworm, which can survive for years. The adult tapeworms attach to the small intestine by their scolex and reside in the small intestine . Length of adult worms is usually 5 M or less for T saginata (however, it may reach up to 25 M) and 2–7 M for T solium. 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 1000 to 2000 proglottids, while T solium adults have an average of 1000 proglottids. The eggs contained in the gravid proglottids are released after the proglottids are passed with the feces. T saginata may produce up to 100,000, and T solium may produce 50,000 eggs per proglottid respectively. (From Global Health, Division of Parasitic Diseases and Malaria, CDC.) A flowchart of the life cycle of Taeniasis species.

Current Medical Diagnosis & Treatment 2024 > Noninvasive Cestode Infections

View in Context

eFigure 37–27. Life cycle of cestodes. Taeniasis is the infection of humans with the adult tapeworm of Taenia saginata, Taenia solium, or T asiatica. Humans are the only definitive hosts for these three species. Eggs or gravid proglottids are passed with feces ; the eggs can survive for days to months in the environment. Cattle (T saginata) and pigs (T solium and T asiatica) become infected by ingesting vegetation contaminated with eggs or gravid proglottids . In the animal’s intestine, the oncospheres hatch , invade the intestinal wall, and migrate to the striated muscles, where they develop into cysticerci. A cysticercus can survive for several years in the animal. Humans become infected by ingesting raw or undercooked infected meat . In the human intestine, the cysticercus develops over 2 months into an adult tapeworm, which can survive for years. The adult tapeworms attach to the small intestine by their scolex and reside in the small intestine . Length of adult worms is usually 5 M or less for T saginata (however, it may reach up to 25 M) and 2–7 M for T solium. 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 1000 to 2000 proglottids, while T solium adults have an average of 1000 proglottids. The eggs contained in the gravid proglottids are released after the proglottids are passed with the feces. T saginata may produce up to 100,000, and T solium may produce 50,000 eggs per proglottid respectively. (From Global Health, Division of Parasitic Diseases and Malaria, CDC.) A flowchart of the life cycle of Taeniasis species.

Current Medical Diagnosis & Treatment 2024 > Noninvasive Cestode Infections

View in Context

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