Three photomicrographs of the cervical spinal cord in the region of the anterior horn revealing Polio Type III degenerative changes. The poliovirus has an affinity for the anterior horn motor neurons of the cervical and lumbar regions of the spinal cord. Death of these cells causes muscle weakness of those muscles once innervated by the now dead neurons. Digitally colourised /false colour image. Optimised and enhanced versions of images produced by the US Centers for Disease Control and Prevention / credit CDC

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Photo credit: © World Illustrated / Alamy / Afripics
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