Changes

== ''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 - there is, therefore, no metacercaria stage.

*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