A week after a family member in the Oregon household exhibited influenza-like symptoms, one of the four cats in the household showed signs of labored breathing.
The cat's owner brought the 10-year-old male to a veterinarian Nov. 4. The cat presented with a 101.7 temperature and a chest radiograph consistent with pneumonia.
After the cat's respiratory rate worsened, the cat was admitted Nov. 5 and treated with oxygen and medication.
The cat died Nov. 7.
Laboratory results from Oregon State University's Veterinary Diagnostic Laboratory and the National Veterinary Diagnostic Laboratory confirmed the cat was infected with pandemic H1N1.
This was the third confirmed case of H1N1 in a cat in the United States, with others surfacing in Iowa and Utah.