AMES, Iowa, Aug. 17 -- Iowa State University issued the following news release: A special set of sugars found on some disease-causing pathogens helps those pathogens fight the body's natural defenses as well as vaccines, say two Iowa State University researchers. This discovery may be a first step in understanding a disease family that includes tuberculosis for which there are currently no good vaccines or cures. Nicola Pohl, professor of chemistry, and Christine Petersen, assistant pro  more