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Just like malaria,
schistosomiasis is caused by a tiny parasite
that's transmitted to humans via an animal host known as a vector.
The vector, in this case though,
is not a mosquito
but a snail.
Yeah, just try there.
So, let's have a look.
Yeah, that looks like one.
So that snail could infect up to 100 people over a period of a couple of months.
And that's the problem.
It's the kind of scale of individuals and numbers
which gives this disease such a roothold in these environments.
It's quite incredible.
Well, it's funny first, let we know we're all standing here
in waders
just wearing gloves,
protecting ourselves
from this rather benign looking snail
while, behind us.
Mums are collecting water
to bathe their kids in.
Everyone's gonna be drinking the water
and washing its.
That's quite right.
The parasite has evolved
to live half of its life in the snail
and half in the people it infects.