Anyone have figures on how many cats get feline leukemia, and how many cat deaths there are?
Cats can be vaccinated for FeLV.
Wikipedia
There are many possible outcomes as to how successfully the cats immune system will react to the virus. About forty percent of cats extinguish the virus. Sixteen percent fight it off due to minimal exposure to it. The other twenty-four percent resist the virus at phase four, which will be described later. All of this usually occurs between sixteen to eighteen weeks after the FeLV infection begins. About twenty percent are able to put the virus into a latent stage, in which the virus will remain until the cat becomes stressed, causing the FeLV to re-emerge. About five to ten percent of cats go through a sequestered stage in which viremia is limited, intermittent, or absent altogether. Approximately thirty percent of cats go through the disease from start to finish, normally resulting in death.
Once the virus has entered the cat, there are six phases to a FeLV infection:
* Phase One: The virus enters the cat, usually through the pharynx where it infects the epithelial cells and infects the tonsorial B-lymphocytes and macrophages. These white blood cells then filter down to the lymph nodes and begin to replicate.
* Phase Two: The virus enters the blood stream and begins to distribute throughout the body.
* Phase Three: The lymphoid system (which produces antibodies to attack infected and cancerous cells) becomes infected, with further distribution throughout the body.
* Phase Four: The main point in the infection- where the virus can take over the body's immune system and cause viremia. During this phase the hemolymphatic system and intestines become infected.
If the cat's immune system does not fight off the virus, then it goes onto:
* Phase Five: The bone marrow becomes infected. At this point, the virus will stay with the cat for the rest of its life. In this phase, the virus replicates and is released four to seven days later in infected neutrophils (white blood cells), and sometimes lymphocytes, monocytes (white blood cell formed in the bone marrow), and eosinophils (another white blood cell).
* Phase Six: The cat's body is overwhelmed by infection and mucosal and glandular epithelial cells (tissue that forms a thin protective layer on exposed bodily surfaces and forms the lining of internal cavities, ducts, and organs) become infected. The virus replicates in epithelial tissues including salivary glands, oropharynx, stomach, esophagus, intestines, trachea, nasopharynx, renal tubules, bladder, pancreas, alveolar ducts, and sebaceous ducts from the muzzle.
Cats diagnosed as persistently infected by ELISA testing may die within a few months or may remain asymptomatic for up to 4 years. The fatal diseases are leukemias, lymphomas, and non-regenerative Anaemias.