If your cat spends time outdoors, and particularly if they are involved in cat fights, then we recommend vaccination. However it should be kept in mind that the vaccination is not 100%protective, and the best protection is to prevent your cat from being bitten. We recognise that there are times when preventing cat fights is impossible, in which case the vaccine is a reasonable alternative.
As there are no commercially available tests that can differentiate between a cat that has been vaccinated from a cat that has been infected, it is important to microchip your cat before vaccinating against FIV. This is because some animal shelters have a policy of euthanasing FIV positive cats; therefore it is possible that a healthy, vaccinated cat could be euthanased if it is not microchipped and the owners cannot be contacted.
If your vaccinated cat has a litter of kittens, it is possible for the kittens to be positive on the test also, so making sure they are microchipped before sale is essential.
The decision to vaccinate a cat should be made after careful consideration of the advantages and disadvantages of vaccination and whether your cat is in the risk group for infection.