I recently attended a CE program on mold (I needed the hours and there isn't much to choose from here, so...). The presenter was from Pro Labs with a PHD in mycology. He surprisingly only spent the last 10 minutes or so pitching their equipment and lab services. In six hours I learned only a handful of useful info: Mildew doesn't grow in your shower. All of the more than 100,000 species grow outdoors on live hosts, the undersides of plant leaves mostly. You can see penicillium aspergillus growing on surfaces by glancing the beam from a laser pointer across them. It's fuzzy enough to refract the beam. Why you would do this I don't know. There are between 14 million and 40 million spores on every square inch of surface on this planet. Removing 99.9% of them leaves 14-40,000 of them behind (per square inch). The hotel conference room we were in had plastic carpeting, vinyl wall coverings, dropped ceilings, and leaky outdated ventilation. By my estimation the spore counts were likely double that in there. The organizer has a sense of humor. The caterer fed us Buffalo chicken wraps with blue cheese for lunch. The mold labs see the writing on the wall. At the close of his presentation, the Doc urged those of us interested in sampling to market our services to Physicians. The next big thing, apparently, is going to be tracking allergens.