I would not suggest using your board for raw poultry or fish but if use if for that purpose then the USDA issued the following statement to safely sanitize your board.

“Both wooden and plastic cutting boards can be sanitized with a solution of 1 tablespoon of unscented, liquid chlorine bleach per gallon of water. Flood the surface with the bleach solution and allow it to stand for several minutes. Rinse with clear water and air dry or pat dry with clean paper towels.”