nathan79 wrote:For Scotland at least you can talk of cryptosporidium instead of giardia(which is a lot less common over here, unless the beavers have brought it-which does actually get monitored).
Can't speak to beavers but dogs are the typical incubators / distributors of giardia in this country.
Plenty crypto floating about, but as has been said stay away from sources near castle pasture and intense sheep grazing and you'd be very unlucky to contract cryptosporidiosis.
Cryptosporidium is also typically spread by birds so likely sources would be slow moving water under places birds congregate, for example, trees where they roost.
There was a cryptosporidium outbreak in Perth in the not too distant past and although they couldn't be certain the word was the source was the swimming pool which had a little outdoors section that was overhung by shrubs that birds favoured for doing all their birdy-stuff in.