A 13-year-old cat in Iowa has tested positive for the H1N1 virus, 'marking the first time a cat has been diagnosed with this strain of influenza,' the American Veterinary Medical Association said in a statement. 'The cat, which has recovered, is believed to have caught the virus from someone in the household who was sick with H1N1. There are no indications that the cat passed the virus on to any other animals or people,' the statement said. State health officials said two of the three people who own it had suffered influenza-like illness before the cat got sick. They recovered, too. The association is tracking all instances of H1N1 in animals and posting updates on its Web site, www.avma.org. Adapted from the The Post's health blog. 