MARSHALLTOWN, Iowa -- More cases of Legionnaires' disease have been confirmed in Marshalltown.

Last week Iowa Health and Human Services announced it was investigating a cluster of Legionnaires' disease in Marshalltown. On Thursday, Iowa HHS said that since August there have been 21 confirmed cases of the disease and one death. As of Monday, the number of confirmed cases in Marshall County had jumped to 30.

Legionnaires' disease is caused by Legionella bacteria. According to Iowa HHS, the disease thrives in warm water environments and typically spreads through the inhalation of aerosolized water droplets like mist.

Iowa HHS says that most people considered healthy don't get sick after being exposed to the bacteria. However, those who are 50 or older, have a weakened immune system, or hav

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