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)
Gedi Convertible Helmet
Rescue / Throw Bags
Hardshell Kayak Sail Rigs
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