T-Lymphocytopenia, Idiopathic CD4-PositiveLymphopeniaLeukocyte CountLymphocyte CountProtein-Losing EnteropathiesParasite LoadOpportunistic InfectionsLeukoencephalopathy, Progressive MultifocalLymphocytesCD4-Positive T-LymphocytesT-LymphocytesCD4 Lymphocyte CountRetrospective StudiesCarboprostPropylene GlycolsRats, Inbred BBLeukocytosis