Introduction
Feline leukaemia virus (FeLV) is a significant pathogen of domestic cats throughout the world [1]. Cats exposed to FeLV may become either persistently viraemic or recover from the infection, with young cats being more rapidly infected following contact exposure [2]. A third category of cats infected with FeLV are those with a latent infection; they are not viraemic, but have a subclinical infection and do not develop FeLV disease [3]. Those cats which do recover from the infection produce virus neutralising antibodies which are considered important in preventing re-infection and can be passed through colostrum to protect neonatal kittens