Legionnaires’ disease update: Three additional cases in Genesee County identified - Outbreak News Today | Outbreak News Today Outbreak News Today
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In a follow-up to reports on the Legionnaires’ disease situation in Genesee County, Michigan, the Michigan Department of Health and Human Services (MDHHS) Monday issued an updated summary for 2015. The update includes three additional LD cases (two deaths) identified since the last report.

Legionella pneumophila bacteria/CDC

Legionella pneumophila bacteria/CDC

“To date, 91 cases and 12 deaths have been identified in total for 2014 and 2015 in Genesee County,” said Eden Wells, M.D., Chief Medical Executive with the MDHHS. “We remain vigilant in identifying any potential case associated with the outbreak.”

All of the new cases were identified by MDHHS personnel from hospital testing data that was recently forwarded to the department. Of the three additional cases, two had not been appropriately reported to the public health system.  The third case was reported in a different jurisdiction and there was no epidemiologic information available to link it to the outbreak. MDHHS has provided additional guidance to the hospital to assist them in providing more accurate reporting moving forward.

The public health investigation has looked at a number of potential exposures that the ill people may have experienced, which included exposures to hospitals, water, and community venues. The investigation was able to identify a common source of exposure for 50 individuals (55 percent) of the 91 total confirmed cases, which is a hospital in Flint, Mich. that is served by the City of Flint municipal water system.  MDHHS cannot conclude that the increase is related to the water switch in Flint nor can we rule out a possible association at this time.

For the May 2015 to October 2015 time period, 46 LD cases and seven deaths have been confirmed in the Genesee County outbreak. Data previously indicated 43 cases and five LD-associated deaths for 2015. The number of cases for June 2014 through March 2015 time period remains unchanged with 45 LD cases confirmed, including five associated fatalities. There were no cases reported in April 2015.


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  1. […] To date, there have been 65 confirmed cases of Legionnaires’ disease in Michigan in 2016. In most years, Genesee County has had nine to 11 cases. Enhanced surveillance and preventive measures are being taken as a result of the increase of cases from 2014-2015 when there were 91 cases. […]

  2. […] On Sep 29, GCHD reported investigating the 10th Legionnaires’ disease case of 2016. For the period of 2014-2015, health officials recorded scores of cases, including 12 deaths. […]

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