I could be wrong ( you never know when dealing with the corporate world) but I understand that this was a problwem in a short batch of the product where the oak fibre was allowed to set too long before use. product made from fresher oak byproduct is fine. once it gets encapsulated in the man-made baord, it can not suffer exposure to the things that cause the micro-organisms to grow. It is only when they begin their life cycle before the sawdust is captured in the prioduct that it can cause the trouble.