Great research! I think in the end analysis this will come down to some really obvious things like bacterial or viral infection and air pollution. Of course this has been overlooked by research because medical research is really conformist, yet it is through mistakes and bold ideas we progress.

I have not even considered Giardia because my mom's cat had it and she is now paranoid over washing the cat's bowl with other dishes. I could see by hand but she insists it cannot even go in the dishwasher! I dismissed her because she tends to over react, but you now have me wondering if she is not so off the mark.

I do know that Giardia is ubiquitous in the environment; it is readily found in soils and groundwater. Even if you are a an avid hand washer, if you were working on your yard and had any sort of cut... I do recall from mom's cat that it is highly transmissible and notoriously hard to eradicate. Interesting thing is most vets do not screen for it. We have always had cats as pets in our family and this cat was the first we had ever heard of Giardia.

Thanks for all the info! Have there been any case studies linking PD to Giardia? If you eradicate it will symptoms improve?

It is annoying how we must resort to being our own researcher and doctor because the most obvious things in the world get overlooked.

Laura