CJD slide preparation. Technician preparing microscope slides of human brain slices to be checked for new variant Creutzfeldt-Jakob disease (vCJD). Behind her another technician places a slide on a microscope. In vCJD virus-like prions in the brain result in the appearance of large vacuoles and protein plaques, making it spongy and killing off the tissue. Symptoms include dementia and sudden muscle contractions, leading to death. The similarly fatal cattle disease BSE (Bovine Spongiform Encephalopathy) has now been linked to human vCJD. Photographed in a security level 3 pathology laboratory at the UK CJD Surveillance Unit in Edinburgh, Scotland.

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