MARSHALLTOWN, Iowa —

Health officials are urging Marshall County residents with possible symptoms of Legionnaires’ disease to get tested immediately, as local clinics have tests available and results could help pinpoint the source of an ongoing outbreak .

“By identifying who actually has Legionnaires’ disease, we can start to get further data and uncover the mystery of where this thing is coming from,” Dr. Lance VanGundy said in a video released by the Marshall County Health Department.

Since August, at least 34 people have been diagnosed with Legionnaires’ disease in the county. One of those people died. The state health department says cases are clustered in north-central Marshalltown.

The cause of the outbreaks remains under investigation. Officials are examining water and air sys

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