Squiffy
I believe wood is naturally antiseptic/antimicrobial. Not sure if that last indefinitely??
I’ve just found this research carried out in Wisconsin,
Although plastic chopping boards have a nonporous surface when new, many of the cheaper boards can scar quite easily when used with sharp cutting implements. With regular use, the damage accumulates over time and creates a rough surface that can become awkward to clean regardless of whether the board is soaked, cleaned manually with hot running water or placed in dishwasher using bleach and detergents. Of course, high-end plastic cutting boards are not as susceptible to such damage in everyday use.
The tests results indicate that the surface of a wooden board will actually stop dangerous bacteria from multiplying and the germs simply die out after a period of about three minutes. Following the experiment, the scientists at the University of Wisconsin found that 99.9% of the bacteria placed on the wooden chopping boards had died out completely within minutes whereas some of the cheaper plastic boards had very little effect in terms of killing dangerous microbes.
After being left overnight in normal room temperature conditions, the wooden chopping boards had no living bacteria left on them at all. Although the researchers were unable to identify how or why the wood cutting boards were able to kill off the bacteria – it really does seem that wood does have antibacterial properties after all.