PRRS in pigs APHA Disease Surveillance Report December 2014 Hemlock poisoning and Tick Borne Fever in sheep Necrotic enteritis in laying hens

Systemic disease Lymphoma: A lymphoma was identified by histopathological examination of the sternal bone marrow of a 16 day old calf. The animal had exhibited bleeding from injection sites, and at postmortem examination widespread haemorrhages on internal organs were described by the practitioner. On the basis of the clinical and pathological findings bovine neonatal pancytopenia (BNP) was suspected, especially as previous cases had been confirmed in the herd. However, histopathological findings of almost complete replacement of the intertrabecular architecture by sheets of cells with varying nuclear morphology and loss of haematopoietic cells and adipocytes, were consistent with neoplasia, most likely lymphoma. The possibility of enzootic bovine leucosis, a notifiable disease caused by bovine leukaemia virus, should be considered for all lymphomas in cattle; however, it is recognised as being a disease of adult cattle. In contrast, sporadic lymphomas are diagnosed in all ages of cattle and include, as in this case, a congenital form in calves.