Because signs of illness in cats can be so subtle, even the most astute owner may miss some of these changes especially when the onset is so gradual. (bracpet.com)
These infections are the most common cause of illness in children and adults. (raisingchildren.net.au)
These cats often came from a happy family setting and were given up because of illness of an owner, divorce, death, etc.. (thesprucepets.com)