health officials say a drug-resistant mutant super-strain of a nasty stomach bug has made its way into the u.s. and is spreading - already causing more than 200 illnesses since last may .
` delhi belly ' or ` montezuma 's revenge ' were traced to people who had recently traveled to the dominican republic , india or other countries .
the symptoms include diarrhea , stomach cramps and nausea .
outbreaks of the shigella bacteria are not unusual , but this strain is resistant to the antibiotic most commonly prescribed for adults that