I can add little to the discussion. Most of the pertinent information has been added and discussed.
What is important is hygiene, washing and caring for the wood board, or any board, as it should be. Simple washing with dishwashing detergent and warm water after cutting raw meats will do wonders. A spray of Clorox and water or vinegar and water will go a long way to avoid problems. JUST DO SOMETHING! I have customers who do nothing and I wonder why I don't see their names in an obituary or at least the hospital records.
Wood can't go in the DW. The high heat will warp the wood and melt even waterproof glue. (The glues can stand up to water but not persistent heat.)
Wood is not, repeat, is not anti-bacterial. It doesn't kill the bugs, just sucks them into the wood fibers where they die from a lack of moisture. Wood is easier on the edges than glass, stone, nylon, composite or other harder types of materials.
Stains can be removed with peroxide. Odors like onion and garlic can be removed with baking soda
Just wash the darn thing in detergent and warm water, dry thoroughly and oil as needed and it will last for years.