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 vessels | + | *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. |
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Revision as of 14:14, 22 December 2008
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.