<i>Lactobacillus rhamnosus</i> (IMAGE) Washington University School of Medicine Caption The probiotic Lactobacillus rhamnosus GG (above) was no more effective than regular medical care in preventing the colonization of superbugs in the gastrointestinal tracts of critically ill patients, according to a pilot study by Washington University researchers. Credit Washington University in St. Louis Usage Restrictions Credit to Washington University License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.