Clay, like French clay, and clay found in Nevada and Oregon has been found to kill bacteria like E.coli and MRSA, plus psuedomonas aeruginosa reports Bloomberg News. The findings are being reproted at the American Chemical Society's annual meeting in New Orleans, USA by researchers from the University of Arizona. The Arizona researchers are not the first to study clay. A French doctor working in Africa noticed the anti-bacterial of clays long ago, but no one would listen to her.