Leusner says an 82-year-old man has died, but investigators are still trying to determine if it was due to Legionnaires' disease or a pre-existing illness.
Six of the 12 Newark cases and two of the three cases in Irvington are believed to be linked, as they occurred among residents living within a mile-and-a-half radius near the Newark-Irvington border.
Legionnaires' disease is a form of pneumonia that can be spread through plumbing and air conditioning systems and can be fatal for people with weakened immune systems.
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