Gastrointestinal disorder (IMAGE) Johns Hopkins Medicine Caption Diagnosing the source of a patient’s illness — in the pictured scenario, a gastrointestinal disorder that may have a bacterial (Salmonella on left) or viral (norovirus on right) cause — may one day be simpler and more accurate using next-generation sequencing (NGS) than with current methods. A recent Johns Hopkins Medicine study found that NGS genetic diagnostic systems show promise but need refinement. Credit Graphic created by M.E. Newman, Johns Hopkins Medicine, using public domain images. Salmonella image courtesy of the National Institute for Allergy and Infectious Diseases; norovirus image courtesy of the U.S. Centers for Disease Control and Prevention Usage Restrictions No restrictions. License Public Domain 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.