Nearly 250 Americans have been sickened by a drug-resistant stomach bug that is linked to overseas travel, federal health officials warned Thursday.
The disease, which has been reported in 32 states since December 2014, comes as the government is already on high alert after outbreaks of potentially deadly antibiotic-resistant infections.
The source of the problem is a bacteria called Shigella that has become resistant to the commonly used antibiotic Ciprofloxacin, which is prescribed to prevent diarrhea during international travel.
Before the outbreak, just 2 percent of Shigella infections developed resistance to the drug. But in recent clusters, 90 percent of samples tested had developed resistance.