Roundworms are the most common internal parasites in cats. Resembling spaghetti, adult worms are three to four inches long. There are several ways cats can become infected. Nursing kittens can get roundworms from an infected mother’s milk, while adult cats can acquire them by ingesting eggs from the feces of an infected cat.
Herpesvirus infection, also known as feline viral rhinotracheitis (FVR), is an infectious disease caused by feline herpesvirus type-1. As with other herpes viruses, the virus is very species specific, and is only known to cause infections in domestic and wild cats. The virus can infect cats of all ages.
5 Rare Cat Diseases. By Dr. Jennifer Coates. When veterinarians are faced with a sick cat, the first thing they do is put together a list of the various diseases that might be responsible. The common ones are at the top and the rare ones are at the bottom. This is called a differential diagnosis.