"This time last year, a painful new virus was knocking on our doorstep. Travelers were bringing chikungunya to the U.S. And eventually, the mosquito-borne virus set up shop in Florida."

"Now the Centers for Disease Control and Prevention says another nasty pathogen is hitching a ride to the U.S. with travelers: multidrug-resistant Shigella."

"Shigella is just about as bad as the word sounds. The bacteria infect your intestines and trigger crampy rectal pain, bloody or mucus-laced diarrhea and vomiting."

"Multidrug-resistant Shigella has caused several outbreaks over the past year in the U.S., the CDC reports Thursday in the journalMorbidity and Mortality Weekly Report. At least 243 people have gotten sick and about 20 percent were hospitalized."