DES MOINES, Iowa —

The Centers for Disease Control and Prevention is assisting Iowa health officials as they investigate more than two dozen cases of Legionnaires’ disease in Marshall County .

The CDC said it has been consulting with the Iowa Department of Health and Human Services since Aug. 29.

Health leaders in neighboring counties say they are watching developments but are not anticipating a spread beyond Marshall County.

Legionnaires’ disease is not transmitted person to person, county health officials emphasized.

It spreads when people inhale mist from contaminated water sources. Identifying and addressing the source is the key to prevention, they said.

“Anywhere there’s water, there could be Legionella,” said Janelle Turner, a communicable disease nurse with the Polk County

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