Hi Anna and Mark,

You are probably aware that "bacteria" disappear on wood surfaces quickly?

This is NOT true of man-made surfaces (plastic).

I forget where I first read this, but the author commented that most folks would probably continue to use plastic dispite the clear risk.

The implication was that bleach with wood was not needed ???? Maybe?? And that bleach with plastic wasn't very good!

How to measure it and tell for sure?

If you search you will probably know much more than I remember pretty quickly!

warm regards to you both, John

Read about the research at UC Davis.

The conclusions:

In addition to our laboratory research on this subject, we learned after arriving in California in June of 1995 that a case-control study of sporadic salmonellosis had been done in this region and included cutting boards among many risk factors assessed (Kass, P.H., et al., Disease determinants of sporadic salmonellosis in four northern California counties: a case control study of older children and adults. Ann. Epidemiol. 2:683-696, 1992.). The project had been conducted before our work began. It revealed that those using wooden cutting boards in their home kitchens were less than half as likely as average to contract salmonellosis (odds ratio 0.42, 95% confidence interval 0.22-0.81), those using synthetic (plastic or glass) cutting boards were about twice as likely as average to contract salmonellosis (O.R. 1.99, C.I. 1.03-3.85); and the effect of cleaning the board regularly after preparing meat on it was not statistically significant (O.R. 1.20, C.I. 0.54-2.68). We know of no similar research that has been done anywhere, so we regard it as the best epidemiological evidence available to date that wooden cutting boards are not a hazard to human health, but plastic cutting boards may be.

From the standpoint of hygiene, a glass cutting board would probably be best. Nothing much grows on glass. But it would play havoc with your knives.

I also have read and heard that wood boards are the best since they are forgiving. A good hardwood board wiped well, or when using it for some meat washing it with soap and water and rinse well, is best. I have never had a problem with getting sick or any of my guests getting sick. As Anna knows. I feed a great many people over the course of a year! For several years now, people are so afraid of "germs" that they want everything sterilized. Many germs are beneficial and help ones immune system. When everything is sterilized, the body's immune system is put off balance.

So clean off the wood cutting board and do not use the plastic one. The wood one is better on your knives as well as your health.

Here is a link to an article I wrote on this topic a few years ago. In this article is a link to an earlier one. The two, taken together, provide a good view of my position on the subject.

http://blog.larryeiss.com/2008/05/19/food-safe-wood/

I am curious to learn why you decided to wash your wooden cutting board with bleach.

The more I learn, the more I think plastic is pretty much always evil. I am working hard to avoid it wherever possible.

The salt solution makes a perfect environment for lactobacillus bacteria. (Same as lacto fermentation of pickles and saurkraut) Lactobacillus likes to eat all that bad stuff that can make us sick.

So... My vote is for a good hardwood cuttingboard.