Germ-Free Mice (IMAGE) University of Wisconsin-Madison Caption Nacho Vivas, lab manager at the Rey Lab in the Bacteriology Department at the University of Wisconsin-Madison, checks on a group of germ-free mice inside a sterile lab environment on June 22, 2015. Credit Bryce Richter/UW-Madison 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.