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Marshall County health director says Legionella outbreak of 74 cases has ended after remediation of cooling towers
Summary
Marshall County Public Health Director Sydney Gruwell told supervisors the August–September Legionellosis outbreak produced 74 cases and two deaths; testing identified Legionella at one business center but not a patient match, and all 12 identified cooling towers completed offline remediation.
Marshall County Public Health Director Sydney Gruwell told the Board of Supervisors on Nov. 5 that a Legionellosis outbreak that began in August 2025 produced 74 confirmed cases and two deaths and is now considered over.
"Since the outbreak began in August 2025, there were a total of 74 cases of Legionellosis and 2 deaths associated with the outbreak," Gruwell said. She said the last case was reported to public health on Sept. 25 and, after two incubation periods, the outbreak was declared concluded on Oct. 23.
Gruwell said public-health teams identified 12 business centers with cooling towers in the geographic area where people were most likely infected. Each site was tested multiple…
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