Just as humans can, cats can suffer from fatal health issues. One of the commonest and most deadly cat diseases is feline Leukaemia.

It is often thought that feline leukaemia is a cancer but it is actually a virus and highly infectious, which can cause cancer. In fact it is a retrovirus known as FeLV which means that as a cat disease, it can only affect cats and cannot be passed to humans or dogs.

FeLV is estimated to infect one to two percent of normal, healthy cats. Cats which regularly go outside are at far greater risk than cats which are kept inside and males contract the infection more often than females and kittens even more so.

This cat disease is commonly transmitted in saliva, through communal food and water bowls, nose to nose greetings and bites. Other means of transmission are urine and faeces so shared litter trays can be a risk. There are additional risks of a pregnant cat passing the disease to her kittens.

If a cat is infected with FeLV the virus will be detectable in the bloodstream about two to four weeks afterwards. However, the infected cat may not display any symptoms; if it does, these are likely to be fever, lethargy, diarrhoea and swollen lymph nodes.

Some cats will not develop the infection because exposure was slight, others will develop an infection which is latent in other words it is suppressed by the cat's immune system and is usually not infectious. Yet others will be permanently infected with FeLV and will carry and pass on the virus. These cats will almost certainly develop other cat diseases within a couple of years and these could be related to immunodeficiency and consequent infections, anaemia, enlarged lymph nodes or platelet disorders or cancer. Unfortunately, this is just the tip of the iceberg and there are likely to be many other manifestations.

There are vaccines against feline leukaemia and cat owner should have all their cats vaccinated annually. However, these vaccines are not one hundred percent effective, so animals which go out a lot and share a house should be tested for this cat disease.