SAN ANTONIO -- An outbreak of a nasty and dangerous stomach bug is infecting people in Texas and health officials still don't even know where the parasite came from.

It can cause diarrhea and vomit for more than a month all while the victim doesn't even know they have it.

Metro Health San Antonio has confirmed there are no known cases here in San Antonio but the agency said it is drafting a letter to send to health care providers to test patients for the bug.

Hundreds of people have come down with this unidentified stomach bug. Experts say its possibly food-borne.

According to the Centers for Disease Control 200 people have come down with the cyclospora infection. Symptoms include diarrhea with sometimes explosive bowel movements, flu like symptoms including loss of appetite, stomach cramps and headaches .

It has been reported in Texas along with Iowa, Nebraska and Wisconsin. So far eight people required hospitalization. The CDC says the outbreak happened in mid-June to early July.

The illness is usually spread when people ingest foods or water contaminated with feces. Experts say it takes about a week from the time you were infected to become sick.

Typically this bug is found in tropical countries.The Food and Drug Administration is investigating if its linked to imported fresh produce.

Also experts said it's unlikely Cyclospora is spread from person to person but the illness could last more than a month if not treated. Over the counter medication will not wipe out this particular stomach bug.

Dr. Fred Campbell from UT Medicine San Antonio says a trained technician can identify the cysts for the parasite and then recommend treatment. Typically a combination of drugs can get rid of the parasite he added.

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