Rivals or allies—how do bacteria and fungi interact in our bodies? Until now, bacteria on our mucous membranes were primarily considered to be antagonists of fungi, as they can inhibit their growth. However, an international research team led by the Leibniz Institute for Natural Product Research and Infection Biology (Leibniz-HKI) in Jena has now been able to show that the yeast Candida albicans and the bacterium Enterococcus faecalis form a dangerous alliance under certain conditions: Instead of fighting each other, they can amplify their impact and cause significantly more severe cell damage together than alone.