What are the characteristics of Schistosoma japonicum?
S. japonicum cercaria look like tiny flatworms with fishtails. The body is about 200 by 70 micrometers, the long thin tail is another 220 micrometers long, and has two “flukes” called furci that are each about 80 micrometers long.
What is the morphology of Schistosoma?
Morphology. Adult human schistosomes are diecious (male and female worms are separate organisms), and the sexes have different morphologies. The adult worms are bilaterally symmetrical and have both a digestive system and oral and ventral suckers for attachment and stabilization.
How does Schistosoma japonicum differ from other trematodes?
Schistosoma. Unlike all other trematodes, schistosomes are not hermaphroditic but dioecious, forming separate sexes. Adult worms have elongate tubular bodies, each male having a unique gynecophoral canal (schisto-soma = split body) in which a female worm resides.
What is the infective stage of Schistosoma japonicum?
The stages in the snail include two generations of sporocysts and the production of cercariae. Upon release from the snail, the infective cercariae swim and penetrate the skin of the human host, where maturation of the worms continues.
What is Schistosomiasis life cycle?
The schistosome life cycle occurs in 2 hosts: snails and mammals. Either asexual or sexual reproduction occurs, depending on the type of host (Figure 1). Asexual reproduction occurs in freshwater snails. In the snail, this begins with the development of miracidia into a sporocyst.
What is the vector of Schistosoma japonicum provide its complete name species?
Introduction. Schistosomiasis (also known as bilharzia) is a vector-borne parasitic disease caused by trematode flatworms of the genus Schistosoma. Freshwater snails act as the vector, releasing larval forms of the parasite into water.
What is the infective stage of Schistosoma?
How big are the eggs of Schistosoma japonicum?
Life cycle Human (definitive host) Morphology Eggs: The ova of S.japonicum are 55-85µm by 40-60 µm. They are large, round and non operculate and have a transparent shell with a minute lateral spine or knob that may be inconspicuous and difficult to see.
What kind of hosts does Schistosoma japonicum infect?
Schistosoma japonicum is an important parasite and one of the major infectious agents of schistosomiasis. This parasite has a very wide host range, infecting at least 31 species of wild mammals, including 9 carnivores, 16 rodents, one primate (human), two insectivores and three artiodactyls and therefore it can be considered a true zoonosis.
What kind of disease does schistosomiasis japonica cause?
It is the cause of schistosomiasis japonica, a disease that still remains a significant health problem especially in lake and marshland regions. Schistosomiasis is an infection caused mainly by three schistosome species; Schistosoma mansoni, Schistosoma japonicum and Schistosoma haematobium.
Where is Schistosoma haematobium found in the world?
Schistosoma japonicum (mostly in Asia) involves the superior mesenteric vessels, and Schistosoma haematobium (mostly in Africa) affects the genitourinary system. Schistosoma japonicum is found principally in China, Indonesia, and the Philippines.