MADISON, Wis. (AP) -- A Madison-based clinic says a former employee may have exposed hundreds of patients to blood-borne diseases such as HIV.

Dean Clinic issued a statement Monday saying the former worker inappropriately used insulin demonstration pens and finger stick devices while training patients between 2006 and this year. The clinic says it is contacting 2,345 patients by phone and letter and will take responsibility for testing them to see if they've been exposed to any diseases.

The clinic says it has notified state and local health officials. A spokeswoman for the clinic didn't immediately return a message.

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