58. Phylum Platyhelminthes. Class Cestoda. Taenia solium. Taenia saginata.

General Overview: Taenia saginata and Taenia solium

• Both species belong to the Class Cestoda, a group of flatworms known as tapeworms.
• Tapeworms have a ribbon-like, segmented body called the strobila.
• Their head, or scolex, is specialized for attaching to the host’s intestinal wall.
• Adult tapeworms live in the small intestine of the definitive host, which is human in both species.

• These parasites are acquired by eating undercooked or raw meat from infected animals.

Taenia saginata (Beef Tapeworm)

• Known as the beef tapeworm due to its transmission through infected cattle.
• Adult worms are large and can reach four to ten meters in length.
• The intermediate host is cattle, where the larval stage (cysticercus) develops in the muscle.
• Humans serve as the definitive host and do not act as intermediate hosts in this species.
• The scolex of T. saginata has four muscular suckers but lacks a rostellum (there is no crown of hooks).
• The gravid proglottids (segments full of eggs) are notable for having more than twelve uterine branches on each side.
• Infection with T. saginata causes taeniasis, an intestinal tapeworm infection, which is generally not serious.