ATLANTA (AP) — Georgia Department of Public Health officials say they're investigating four cases of a gastrointestinal illness that has sickened more than 370 people in 15 states.

Department spokeswoman Nancy Nydam said Wednesday that three Georgia women and a man have fallen ill with Cyclosporiasis (sy-kloh-spohr-EYE'-uh-sihs), a parasite known to cause diarrhea, stomach pain, cramps and fatigue about a week after exposure. One case required hospitalization.

Nydam says officials are working with the Centers for Disease Control to investigate the outbreak of the illness.

Officials have said 372 people have been sickened by the parasite nationally. Health officials in some states have linked the bug to a prepackaged salad mix.

Officials are unsure of what caused the Georgia illnesses, but Nydam says Cyclosporiasis is often linked to berries, leafy greens and herbs.