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Legionnaires' Disease Cases Surge in Marshall County

9/19/2025

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Summary

Story summary

Legionnaires’ disease cases in Marshall County rose to 68 as of September 18, according to Iowa HHS.
Public Health Director Sydney Grewell identified a cooling tower as the likely outbreak source, with 12 towers tested.
Remediation efforts continue despite no test results being returned.
The 2-14 day incubation period accounts for the ongoing rise in cases.
Officials emphasize low public risk and encourage participation in local events.

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Story summary

Legionnaires’ disease cases in Marshall County rose to 68 as of September 18, according to Iowa HHS.
Public Health Director Sydney Grewell identified a cooling tower as the likely outbreak source, with 12 towers tested.
Remediation efforts continue despite no test results being returned.
The 2-14 day incubation period accounts for the ongoing rise in cases.
Officials emphasize low public risk and encourage participation in local events.