E. coli H30 Strain (image) University of Washington Health Sciences/UW Medicine Share Print E-Mail Caption This is an electron micrograph of a single E. coli bacterium of the pandemic H30 strain. The pathogen, which largely infects the urinary tract, can cause mild or no symptoms, but later serious complications might set in. H30 E. coli infections are more common in the elderly. Credit Dagmara Kisiela/Univeristy of Washington Usage Restrictions None Share Print E-Mail 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.