MARSHALL COUNTY, Iowa -- According to the Iowa Department of health and Human Services, the number of Legionnaires' disease cases has almost doubled in the last week.

The Iowa Department of Health and Human Services announced a cluster of Legionnaires' disease cases in Marshall County earlier this month, stating 21 people had been infected and that one person had died as a result.

Legionnaires' is caused by bacteria that spreads through the inhalation of aerosolized water droplets, such as cooling towers, hot tubs, and fountains. According to health officials, the disease is not contagious and most healthy people who become exposed do not become sick.

Days later, Iowa HHS announced that the number of cases had risen from 21 to 30, with officials again raising the number to 34 cases on T

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