I've got a foster kitten who is having a reccurrance of an upper respiratory infection. She had it when I got her, just got over it when she went to the vet to get spayed, then a week and a half later started showing symptoms again. She is getting treatment again, but I am wondering if she could have been contagious prior to showing symptoms. The other 2 cats I have are not showing symptoms, but my ferret, a recent addition to our furry family, is.