What is the life cycle of Diphyllobothrium latum?
The life cycle of D. latum, as it relates to humans, begins when un-embryonated eggs are released into the feces of humans that were infected with the intestinal parasite. These eggs will become embryonated in water under appropriate conditions, with the process usually lasting 18 to 20 days.
What is the distinguishing features of Diphyllobothrium latum?
The adult Diphyllobothrium latum may reach up to 12 meters, increasing throughout its life. These whitish/yellow worms are dorso-ventrally flattened, and much more narrow than they are long. They have no oral opening, thus feeding through absorption.
What is the common name for Diphyllobothrium latum?
broad fish tapeworm
Dibothriocephalus latus (=Diphyllobothrium latum), the “broad fish tapeworm”, is usually assumed to be the most common agent of human diphyllobothriasis.
What is the mode of transmission of Diphyllobothrium latum?
Diphyllobothrium latum, or fish tapeworm, is one of the pseudophyllidean cestodes transmitted via aquatic species. Human infection with D. latum is acquired by eating uncooked freshwater fish containing the parasite’s plerocercoid cysts.
What is the definitive host of Diphyllobothrium Latum?
The life cycle of Diphyllobothrium (Fig. 121.10) requires three hosts: (1) the definitive hosts are predominantly humans and fish-eating carnivores; (2) the first intermediate hosts are a large number of copepod species (crustaceans); and (3) the second intermediate hosts are fresh-water, anadromous, and marine fish.
What is the largest tapeworm?
The longest tapeworm ever removed from a human was 82 feet long, and was removed from a patient in India. The man had complained of abdominal pain for several months and had anemia. A tapeworm is a parasite (Diphyllobothrium datum) that can live in the small intestine and has the ability to grow rapidly.
What is the function of Rostellum?
Function. The rostellum is an organ of attachment of tapeworms, in addition to the surrounding suckers, to the intestinal wall of the host. It is protruded during attachment, and by the use of hooks penetrates the intestinal mucosa.
What is the meaning of Latum?
Medical Definition of Diphyllobothrium : a large genus of tapeworms that is the type genus of the family Diphyllobothriidae and that comprises a number of parasites of fish-eating birds and mammals including the fish tapeworm (D. latum) of humans — compare bothriocephalus.
What does Diphyllobothrium Latum cause?
Diphyllobothrium latum and related species (the fish or broad tapeworm), the largest tapeworms that can infect people, can grow up to 30 feet long. While most infections are asymptomatic, complications include intestinal obstruction and gall bladder disease caused by migration of proglottids.
What is the smallest tapeworm?
granulosus is the smallest of the tapeworms (3-9 mm long) and it only has three proglottids.
How long is a tapeworm?
Adult tapeworms may measure 4-28 inches in length. As the tapeworm matures inside the intestine, these segments (proglottids) break off and pass into the stool.
What is rostellum Where does it occur?
The rostellum is a projecting part of the column in Orchidaceae flowers, and separates the male androecium from the female gynoecium, commonly preventing self-fertilisation.
Where can I find Diphyllobothrium stemmacephalum latus?
Among the cetacean-associated species, Diphyllobothrium stemmacephalum is found mostly in dolphins and porpoises, and D. balaenopterae in whales. Dibothriocephalus latus has a relatively wide distribution, but is most common in circumpolar regions; it is also known to occur very rarely in South America, perhaps through importation and aquaculture.
Are there any historical cases of Diphyllobothrium?
However, it is possible that many historical cases were falsely attributed to this species.
Where does the Diphyllobothrium latum scolex attach to?
Diphyllobothrium latum scolex The adult worm is composed of three fairly distinct morphological segments: the scolex (head), the neck, and the lower body. Each side of the scolex has a slit-like groove, which is a bothrium for attachment to the intestine. The scolex attaches to the neck, or proliferative region.
What are the intermediate hosts of diphyllobothrius latus?
Intermediate and paratenic hosts include a wide diversity of freshwater and marine fishes, commonly perch and pike for Dibothriocephalus latus and salmon for D. nihonkaiense. Definitive host specificity among the medically important diphyllobothriids is low.
