Hawaii health officials are investigating the first possibly locally acquired case of the parasite illness cyclosporiasis in about a decade, an unwelcome development for local farmers even though the risk to the public stays low.

• This is the sixth case on Oahu since July, and the first in someone who had not traveled while likely exposed.
• Investigators are retracing everywhere the patient ate, drank and shopped to find the source.
• Farmers stress that a local case does not mean local produce caused it, and are urging shoppers to keep buying from island growers.
• Shoppers at Oahu farmers markets say they are not changing their habits.
• Washing produce lowers the risk, and cooking kills the parasite — chilling or freezing does not.

Outlook: The source hunt continues, and until it turns something up, local farms face doubt they say they do not deserve.