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PHILADELPHIA (CBS) — The discovery of a rabid fox has residents on the Main Line on alert.

A Radnor resident called authorities to report a fox acting strangely in his backyard.

The next day, he found the fox dead.

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It was taken for testing and results came back positive for rabies.

As a precaution, officials urge pet owners to have their vaccinations up to date and urge humans to stay away from stray or wild animals.