Klebsiella (IMAGE) Arizona State University Caption False-colored scanning electron microscope image of two Klebsiella pneumoniae bacteria (yellow) interacting with a human white blood cell (green). Klebsiella pneumoniae, a bacterial enzyme that plays an important role in antibiotic resistance was examined by the new European XFEL instrument. (Klebsiella measures 1 to 2 microns long.) Credit National Institute of Allergy and Infectious Diseases (NIAID) 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.