MICROBIOME NEWS: Antibiotic use may increase risk of bowel disease. “Among folks who were 40 or older, a new study found that antibiotics may increase the risk for bowel diseases, such as Crohn’s and ulcerative colitis, for one to two years after use. And the greatest risk was posed by two classes of antibiotics – nitroimidazoles and fluoroquinolones – often used to treat gut infections.”