Table of Contents
What is cysticercoid larva?
A cysticercoid is the larval stage of certain tapeworms, similar in appearance to a cysticercus, but having the scolex filling completely the enclosing cyst. In tapeworm infections, cysticercoids can be seen in free form as well as enclosed by cysts in biological tissues such as the intestinal mucosa.
Where is cysticercoid found?
The larval stage infective for the dog is called cysticercoid and develops in the body cavity of the intermediate host.
What is the larval stage of Hymenolepis nana?
Hymenolepis nana is unique among tapeworms in that the adult worm develops after the egg is ingested. The hooked oncosphere then invades the intestinal mucosa and develops into a cysticeroid larva.
What is the infective stage of H Nana?
About 20 to 30 days after initial ingestion, the worm begins to shed eggs in the stool. H. nana adults live for only 4 to 6 weeks, but eggs shed in the stool are immediately infective. Self-inoculation or internal autoinfection allows colonization to persist for years.
What is the difference between cysticercosis and Taeniasis?
What is the difference between cysticercosis and taeniasis? Remember, taeniasis is the infection of a human with the adult form of the beef or pork tapeworm. Cysticercosis is the infection of a human with the larval stage of the pork tapeworm, T. solium, only.
What is the larva stage of Taenia Saginata?
Taenia saginata Infection Taenia saginata, the beef tapeworm, is acquired by eating uncooked beef. Cattle are the intermediate host, whose flesh contains cysticerci, the larval stages. In the human small intestine, after ingestion, these develop into long, flat, segmented adult worms.
What is the larval stage of Taenia solium called and what animal is this larva normally found in?
Taenia solium is a cyclophyllid cestode with adults found in the small intestine of people and the larval stages (Cysticercus cellulosae) found in muscle tissue of pigs. It occurs in people in many countries of the world especially where pork is a major source of food.
What causes Nana infection?
nana, and humans can become infected with the latter by direct ingestion of eggs. Within the arthropod host, the eggs develop into cysticeroids, which can infect the mammalian host upon ingestion and develop into adults in the small intestine.
What is the pathogenesis of Hymenolepis nana?
Hymenolepiasis is the most common intestinal tapeworm infection of humans caused by worm of family cestoda, genus Hymenolepis and species nana. This infection does not require an intermediate host and infection can occur directly from one infected person to another by fecal-oral transmission.
What is Plerocercoid larva?
Medical Definition of plerocercoid : the solid elongate infective larva of some tapeworms especially of the order Pseudophyllidea usually occurring in the muscles of fishes.
What is the function of Proglottids?
Platyhelminthes. … (body) typically consists of numerous proglottids, each of which is usually a self-sufficient reproducing unit with all of the sexual organs necessary to reproduce.
What is the larval stage of Taenia solium?
The larval stage of Taenia solium is Cysticercus cellulosae, the cause of porcine and human cysticercosis.