<i>Caulobacter</I> (IMAGE) ETH Zurich Caption Caulobacter crescentus is a harmless bacterium living in fresh water throughout the world (electron microscope image). Credit ETH Zurich 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.