NEW YORK (AP) — A rabid dog imported into the United States this month has sparked a public health investigation across several states.

Health officials say a dog brought to the U.S. from Azerbaijan that ended up with a family in Chester County, Pennsylvania began acting strangely. It later tested positive for rabies and was euthanized. At least 12 people were exposed to the animal.

The dog was one of 34 animals — 33 dogs and one cat — imported by an animal rescue organization from Azerbaijan to O'Hare International Airport in Chicago on June 10.

The animals were not in the main cabin of the plane or main terminal of the airport. Travelers through O'Hare are not considered to be at risk, but health officials are checking to see if other animals in the shipment are infected and are still tracking down the pets' new owners.

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