Vaccine linked to 'bleeding calf syndrome'

Bleeding calf syndrome (bovine neonatal pancytopenia or BNP) affects new born calves resulting in low blood cell counts and depletion of the bone marrow. It first emerged in 2007 and a serious number of cases are reported each year. In affected calves, bone marrow cells which produce platelets are also destroyed. Consequently the calves' blood does not clot and they appear to bleed through undamaged skin. There is evidence that BNP is linked to the use of a particular vaccine against "Bovine viral diarrhea virus" (BVDV).

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