to the original question, which was not about the need to filter water but rather is there a pattern of distribution of cryptospiridium and giardia.
I maintain there is from what amateur research I have been able to do. Whether or not I have had it is of less interest. (and I have from Mexico in unsanitary conditions, not on a trip)
Touring Kayak Paddles
Classic Freestanding Rack
Kindle / iPad Cases
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