Originally Posted by chef2sail
.......Secondly the polyethalene board keeps doesnt dull your knife as quickly.....
The debate over whether natural wood has natural anti-bacterial properties and plastic is a natural petri dish is interesting. Bottom line, as I know you know, you can't cross contaminate anything, wood or plastic. Whether they continue to retain contaminants after you wash them might have something to do with how well you wash them. It is easier to throw a poly board in the dishwasher.
Nevertheless, from personal experience, I was surprised to see the above conclusion. I find poly to be much more abusive to rounding over fine knife edges.