Kittens and older cats are at greater risk of serious complications. It is a serious problem in many catteries and multi-cat households. FeLV is one of the most common causes of illness and death in cats. It is a cancer-causing virus that can suppress the cat's ability to fight infections. Kittens can be born with the virus.
Cats can have the Leukemia Virus for years before showing symptoms.
The doctor may recommend that your pet be tested for FeLV prior to receiving a FeLV vaccination. Panleukopenia, also called feline distemper, is a highly contagious, often fatal disease, especially dangerous to kittens. Symptoms include loss of appetite, vomiting, diarrhea, high fever and depression. Pneumonitis in cats is caused by Chlamydia psittaci. Symptoms are similar to those of calici virus infection and rhinotracheitis.