New pathogenic bacterium pinpointed: “Scientists have discovered a previously unknown bacterium lurking in human lymph nodes, a finding that suggests there are many more disease-causing bacteria still to be discovered. The bacterium is thought to cause chronic infections in patients with a rare immune disorder called chronic granulomatous disease (CGD), and the research team is now investigating whether it might be involved in conditions that are more common, such as irritable bowel syndrome.” (Nature)