Feline Leukaemia (FeLV)
The feline leukaemia virus directly attacks the immune system of cats. Symptoms include apathy, loss of appetite, weight loss, vomiting, diarrhoea, pale or yellow-looking mucous membranes and reproductive issues. Cats infected with FeLV are also more susceptible to infection, blood cancer and tumours. While most cats show obvious symptoms, some may not show any sign of infection at all. Up to a third of infected cats spread the disease to others in their tears, saliva, urine and nasal secretions. The disease can even be spread by flea bites, sneezing, mutual grooming or fighting.