CDC genetic testing may help prove that untreated Flint River water contributed to an outbreak of Legionnaires’ disease in and around the city, the MLive site reports.

More than 100 individuals, of whom 12 have died, have contracted the bacterial disease in the Flint area since the outbreak began in 2014. Michigan state officials suspected in early 2015 that Legionnaires’ cases may have been linked to Flint’s 2014 decision to begin using the Flint River as a source of tap water but didn’t make that suspicion public until nine months later.

City, state, and federal officials’ failures to properly treat and monitor Flint’s tap water after the Flint River switch are also believed to have caused an epidemic of lead contamination.

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