I have fished out west, and they have a similar problem with transporting spores from one river to another. They suggest to throughly clean your boots and wadders when leaving a stream and before entering another stream, as to not transport the spores with you. If you are to go to another stream within a day or so of fishing in a stream that you should place your wadders in the freezer over night to kill any spores that you may still have on them. I don't know about you, but I don't think my wife would like to see my wadders in the freezer. Also if you are not to go into another stream within 3-4 days that you should be fine because the spores would dry out and die. I believe that it is a bigger problem in the west, due to the fact that a totally new river system could be within a mile or two. It is really easy to fish several different rivers in a day.