In this week’s column David Niesel and Norbert Herzog look at new research that has shown the bacterium Clostridium difficile, or C. diff, could be among the microbial visitors brought into your house on your shoes. C. diff commonly resides in the soil and can cause significant intestinal disease in humans. C. diff produces stable forms called spores that can survive on surfaces for up to 90 days. These spores are resistant to drying and cleaning agents. That provides the opportunity to transfer the bacteria to your hands and eventually your mouth. This column also published in The Galveston County Daily News.