This is the website of Professor Graham Rook. It has been set up to give rapid access to the latest thinking on the "Old Friends mechanism", a reformulation of the hygiene hypothesis. It contains mostly recent publications, together with their abstracts, and links that will enable most of them to be downloaded.

The website discusses the evolutionary theory and immunological mechanisms behind the Old Friends mechanism, and point out the implications for human health and wellbeing in rich developed countries.

The website is at http://www.grahamrook.net/