New Hampshire public health officials say an autopsy has confirmed a patient who may have exposed others to the rare brain disease Creutzfeldt-Jakob died of it.

After the patient died in August officials suspected Creutzfeldt-Jakob, an always-fatal disease characterized by rapidly progressive . But the only way to confirm it is through a brain biopsy or autopsy.

The patient had at Catholic Medical Center in Manchester in May. Officials warned eight other patients they may have been exposed because the proteins that cause the disease survive standard techniques used to sterilize surgical equipment.

Five others in Massachusetts and Connecticut also were notified because the equipment was rented and used elsewhere. But officials say such transmission is extremely rare.