I've been using Aqua Mira for a while as my primary defense against Giardia (along with good hand washing/purifying). A friend who was on an 8 day canoeing trip with me in Canada a little over a week ago is coming down with an intestinal problem that sounds like it might be giardiadasis. She just sent me a link from a MayoClinic site indicating that chlorine and iodine pills do not prevent giardia (at the end of the prevention section of their article). Anyone care to offer an opinion about the validity of this statement and how it relates to the use of Aqua Mira?
http://www.mayoclinic.com/health/giardia-infection/DS00739/DSECTION=2

thanks,
Gerry Magnes