FeLV infection is probably the most common infectious cause of death in young cats.
Clinical disease is seen in persistently infected cats, most of which will die within 4 years of meeting the virus. The clinical syndromes associated with FeLV infection are mainly associated with infection of the haemopoietic system. Infection of the bone marrow can have severe effects on the development of both lymphoid and myeloid cells giving rise to proliferation (neoplasia) or depression, although the precise mechanisms of pathogenesis are often not known. In addition, FeLV infection is often associated with reproductive failure.
Thymic (anterior mediastinal) lymphosarcoma
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