The botanical drug Kratom is under fire from health officials who say it’s a dangerous and addictive opioid and a new report links Kratom with multi-state Salmonella outbreak.

On Tuesday, the Centers For Disease Control, the Food and Drug Administration and several states are investigating 28 salmonella infections in 20 states linked to Kratom use.

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The CDC says eleven people have been hospitalized and no deaths have been reported.

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Kratom is a natural herb promoted as an alternative to opioid pain killers and help treat pain, depression and anxiety. It comes in powders and pills.

MORE: CDC Salmonella Kratom case count map

The CDC has not identified a common source, supplier or specific brand responsible for the outbreak, and warns not take Kratom in any form because it could contain Salmonella.

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