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CHALMETTE, La. -- State officials say water samples in St. Bernard Parish have come back negative for the flesh-eating amoeba that killed a boy last year.

Increased chlorine levels over the last several months have controlled the rare Naegleria fowleri amoeba, according to the Louisiana Department of Health and Hospitals.

The amoeba has killed three people in Louisiana since 2011.

'While the water in St. Bernard Parish was always safe to drink, these negative test results give us confidence that it is now safe for all uses,' said DHH Secretary Kathy Kliebert. 'We will continue to work with parish leaders to monitor the system so that all families in the parish can feel safe.'

The most common way to contract the amoeba is when water goes up through the nose. Officials believe the 4-year-old boy who died in September contracted the virus while playing on a slip and slide.

More sampling and testing will be done later in the year 'out of an abundance of caution,' according to the DHH.

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