Hawaii health officials are looking into what may be the state's first case of the stomach parasite cyclospora caught locally, a worrying sign for local food safety.

• An Oahu patient got sick at the end of July without leaving Hawaii during the window when they would have been infected.
• Every earlier case this year was tied to travel, so this one breaks the pattern.
• It is the sixth cyclospora case the Hawaii Department of Health has investigated.
• Investigators are now trying to trace how the parasite was picked up on the island, which usually points to contaminated fresh produce or water.

Outlook: Health officials will keep hunting for the local source, and more cases could turn up if a contaminated food supply is behind it.