Experts and some public officials are warning against raw pet foods after a cat in Oregon was found to have died from a product contaminated by bird flu. The maker of that cat food, Northwest Naturals, has since recalled certain batches of the turkey-based food.

The ongoing spread of bird flu in the United States has alarmed experts -- not just because of human cases causing severe illness, but also due to troubling new instances of infections in cats.

A big cat sanctuary in Washington is temporarily closed and quarantined after bird flu killed 20 wild cats there, including cougars, bobcats and a tiger.

The bird flu virus found in a severely ill patient hospitalized in the United States has mutated to become better adapted to human airways, though there is no evidence it has spread beyond the individual,

Federal health officials say that not only has a Louisiana resident contracted the first severe case of bird flu in the U.S., but that the virus likely mutated in the patient. The findings raise concern regarding the adaptability of the virus.

The CDC said Thursday its analysis of samples from a Louisiana patient with bird flu showed mutations not seen in samples from an infected backyard flock