Quote:
Originally Posted by
APNelson 
Myri, my new cat has been sneezing a lot again. I expected it when I first got her and the adoption agency gave me some meds that should have taken care of the typical URI, but it's been about a month and she's started sneezing again. Are there any other possible causes of sneezing (allergies, etc?) I took her to the vet once, but that was when it was still URI.
Rodney hasn't started showing any symptoms, so whatever's causing it isn't contagious.
There are many different strains of the Feline Upper Respiratory Viruses. Here are some websites for you to look at:http://pets.webmd.com/cats/guide/upper-respiratory-infection-cats, http://www.catsexclusive.com/handouts/upperrespiratory.pdf, and http://www.veterinarypartner.com/Content.plx?P=A&A=613.
In general, it is a virus and it needs to run its course. However, many times a secondary infection takes hold in the cat and that needs antibiotic. When your cat sneezes, does the cat have clear fluid/mucus coming out? Or does it have a color, like yellow or brown? If the cat is excreting colored mucus, please take the cat to a veterinarian you trust. Since the colored mucus/fluid, is an indication that the cat has a secondary infection.
As for the other cat not catching the URI, be glad
. Since it is most likely a virus, it is most likely contagious. But, as links explain, there are many factors that contribute to cats getting a URI.