Recent outbreaks of an unpleasant intestinal illness in Massachusetts, California and Pennsylvania are due to a drug-resistant version of a bacteria that causes travelers' diarrhea, the Centers for Disease Control and Prevention warned this week. Since May 2014, Shigella sonnei bacteria that have shown resistance to the antibiotic ciprofloxacin have sickened 243 people across 32 states and Puerto Rico, the federal agency said. "Research by the CDC found that the drug-resistant illness was being repeatedly introduced as ill travelers returned and was then infecting other people in a series of outbreaks around the country," the CDC explained. Shigellosis is often...