Changes

The clinical signs in the immunosuppressive stage of the disease are related to secondary infections and are therefore extremely variable. Clinically, the associated conditions cannot be distinguished from those occuring in feline leukaemia virus-related immunosuppression. Patients often present with vague signs, such as inappetance or weight loss, and a history of recurrent minor illness related to the gastrointestinal or upper respiratory tract is common. Disease of the oral cavity including gingivits and stomatitis is frequently seen. This can be linked to secondary pathogens such as calicivirus and oral bacteria. Calicivirus, along with other organisms such as herpesvirus, ''Toxoplasma gondii'' and ''Chlamydia psittaci'', can cause ocular signs including conjunctivitis, keratitis, uveitis and chorioretinitis in 35% of cases. Similar microbes give rise to secondary cat flu, and diarrhoea occurs in a quarter of affected cats.  Other common signs due to immunosupression include anaemia (due to ''Haemobartonella felis''), meningoencephalitis, pneumonia, glomerulonephritis, renal failure, cystitis and pyoderma, caused by a variety of bacteria. The potentiating effects of FIV on FeLV infection can also induce neoplasia.

The clinical signs in the immunosuppressive stage of the disease are related to secondary infections and are therefore extremely variable. Clinically, the associated conditions cannot be distinguished from those occuring in feline leukaemia virus-related immunosuppression. Patients often present with vague signs, such as inappetance or weight loss, and a history of recurrent minor illness related to the gastrointestinal or upper respiratory tract is common. Disease of the oral cavity including gingivits and stomatitis is frequently seen. This can be linked to secondary pathogens such as calicivirus and oral bacteria. Calicivirus, along with other organisms such as herpesvirus, ''Toxoplasma gondii'' and ''Chlamydia psittaci'', can cause ocular signs including conjunctivitis, keratitis, uveitis and chorioretinitis in 35% of cases. Similar microbes give rise to secondary cat flu, and diarrhoea occurs in a quarter of affected cats.  Other common signs due to immunosupression include anaemia (due to ''Haemobartonella felis''), meningoencephalitis, pneumonia, glomerulonephritis, renal failure, cystitis and pyoderma, caused by a variety of bacteria. The potentiating effects of FIV on FeLV infection can also induce neoplasia.

The virus itself may also have certain effects. Half of all cats affected display lymphomegaly, and pyrexia occurs in 30% of cases²

The virus itself may also have certain effects. Half of all cats affected display lymphomegaly, and pyrexia occurs in 30% of cases².

===Laboratory Tests===

===Laboratory Tests===