Two cats in two separate New York City households have tested positive for bird flu, the city health department says.

Health authorities say the threat of infection for people remained low even amid the spread of H5N1 virus among birds and cattle nationally.

Health officials urged pet owners not to let their felines roam outdoors or feed them raw food or raw milk — common ways avian influenza can be transmitted.

There's a warning for pet owners after the deadly bird flu virus infected at least two cats in New York City. CBS News New York's Derick Waller reports a specific kind of pet food could be to blame.