Flavonoid-Rich Foods (IMAGE) Washington University School of Medicine Caption Researchers at Washington University School of Medicine in St. Louis have found that a particular gut microbe can prevent severe flu infections in mice, likely by breaking down naturally occurring compounds -- called flavonoids -- commonly found in foods such as black tea, red wine and blueberries. Credit Getty Images Usage Restrictions None 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.