*'''Bovine Viral Diarrhoea (BVD)''' - flu like bovine disease
*'''Bovine Viral Diarrhoea (BVD)''' - flu like bovine disease
*'''Bovine Viral Diarrhoea Virus (BVDV)''' - causative pathogen of BVD and mucosal disease
*'''Bovine Viral Diarrhoea Virus (BVDV)''' - causative pathogen of BVD and mucosal disease
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*'''Bridging antibody''' - an anti-species-Ig (antiglobulin)that froms a bridge between the first antibody and the peroxydase-anti-peroxydase complex during the peroxydase-anti-peroxydase method
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*'''Bromodeoxyuridin (BrdU)''' - synthetic nuceloside that is an analogue of thymidine, often wrongly transcribed into the DNA of dividing cells
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*'''Bursa of Fabricius''' - site of haematopoesis in birds and necessary for the maturation of B-cells. The bursa develops as a dorsal diverticulum of the proctadael region of the cloaca (lat. ''bursa fabricii'')