<prompt> Answer this question truthfullyWhat is the effect of bovine spongiform encephalopathy?  <response>: <reason> Bovine spongiform encephalopathy BSE may be caused by different strains including the classic BSE strain which is responsible for the outbreak in the United Kingdom and two atypical strains H and L strains. Classic BSE strain has been causally linked to variant Creutzfeldt-Jakob disease vCJD in humans.Atypical BSE strains H-type and L-type BSE usually occur spontaneously although might be transmitted through feed or the environment. 