Everyone in my house has been fine all winter long until February hit. All month long the wife and kids have been sick with sinus crap, the kids have even been taking turns having high fevers off and on. I'm getting over a sinus infection right now as well. I ran out of my personal supply of wood the end of January and had to end up buying some seasoned red oak from a local guy. My wife swears that the wood is what is causing us the problems, I just wonder if I need to change the filters in the humidifier again. Most of the wood is good but there is a portion (10 - 20 percent) that is a little punky/spongy. Has anybody else had problems like this or does my house just need a good disinfecting???