Difference between revisions of "Schistosoma"
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== ''Schistosoma'' Species == | == ''Schistosoma'' Species == | ||
| − | *The schistosomes are also known as "blood-flukes" | + | *The schistosomes are also known as "blood-flukes" |
| − | *There are several important species producing serious human and animal disease in the tropics | + | *There are several important species producing serious human and animal disease in the tropics |
| − | *The pathology is mostly associated with the passage of eggs through the liver, urinary bladder or intestinal wall (depending on the predilection site of the fluke) | + | *The pathology is mostly associated with the passage of eggs through the liver, urinary bladder or intestinal wall (depending on the predilection site of the fluke) |
| − | *As their common name suggests, the adults live in blood | + | *As their common name suggests, the adults live in blood vessels |
| − | *Unusually for a trematode, the sexes are separate | + | *Unusually for a trematode, the sexes are separate |
| − | *The smaller female lies enveloped by the male | + | *The smaller female lies enveloped by the male |
| − | *The eggs of most species have spikes to assist their passage through host tissue to get into faeces or urine (depending on predilection site) | + | *The eggs of most species have spikes to assist their passage through host tissue to get into faeces or urine (depending on predilection site) |
| − | *The intermediate hosts are water snails | + | *The intermediate hosts are water snails |
| − | *On release, the cercariae swim in water and actively seek their final host, which they enter by skin penetration | + | *On release, the cercariae swim in water and actively seek their final host, which they enter by skin penetration |
| + | **There is therefore no metacercaria stage | ||
Revision as of 23:18, 11 January 2009
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Schistosoma Species
- The schistosomes are also known as "blood-flukes"
- There are several important species producing serious human and animal disease in the tropics
- The pathology is mostly associated with the passage of eggs through the liver, urinary bladder or intestinal wall (depending on the predilection site of the fluke)
- As their common name suggests, the adults live in blood vessels
- Unusually for a trematode, the sexes are separate
- The smaller female lies enveloped by the male
- The eggs of most species have spikes to assist their passage through host tissue to get into faeces or urine (depending on predilection site)
- The intermediate hosts are water snails
- On release, the cercariae swim in water and actively seek their final host, which they enter by skin penetration
- There is therefore no metacercaria stage