http://articles.mercola.com/sites/articles/archive/2006/03/04/computer-mice-or-trackballs-may-get-you-sick.aspxThe Korea Consumer Protection Board tested the bacteria content of six items commonly handled by large numbers of people. Shopping Cart Handles and Computer Mice Shopping cart handles were the worst, containing 1,100 units of colony-forming units of bacteriaenCommunityServer 2008.5 SP1 (Build: 31106.3070)