Arizona State University and Mayo Clinic researchers have found that one type of clay, Oregon blue clay, may help fight disease-causing bacteria in wounds, including treatment-resistant bacteria. In laboratory tests, the researchers found that the clay has antibacterial effects against bacteria such as Escherichia coli and Staphylococcus aureus, including strains such as carbapenem-resistant Enterobacteriaceae and methicillin-resistant Staphylococcus aureus (MRSA).