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MARSHALLTOWN — The Legionnaires’ disease outbreak that sickened 74 people and led to two deaths in Marshalltown in August and September has been declared over after more than a month without any new cases.

Legionnaires’ disease is caused by Legionella bacteria, which thrive in warm water and typically spread when a person inhales aerosolized water droplets.

State and local public health officials said they believed the source of the Marshalltown outbreak was a cooling tower . Early in the outbreak, they said all of the cases had been in residents who live in the north central part of the city .

Marshall County Public Health Director Sydney Grewell provided a final update on the outbreak

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