Story highlights McLaren Hospital in Flint said it has taken corrective measures with its water supply

The hospital noticed an increase in Legionnaires' cases after the city switched its water supply

(CNN) A hospital in Flint, Michigan, reported Friday that low levels of Legionnaires' disease bacteria were discovered in its water system.

The discovery came after the city switched its water supply and the medical staff noticed an increase in people coming in for treatment who were diagnosed with Legionnaires,' McLaren Hospital said.

Legionnaires' disease is a respiratory bacterial infection usually spread through mist that comes from a water source.

McLaren Hospital said it has taken corrective measures with its water supply.

All testing shows the hospital water supply "is well within safety and quality standards," the hospital statement said, and no tests show McLaren was the source of Legioinnaires' disease.

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