Presumptive centrifugal spread of PrP(Sc) from the brain through the optic nerve occurs in two major types of CJD. PrP(Sc) is a marker of CJD infectivity. Given that routine decontamination may not remove PrP(Sc) from surgical instruments, a careful risk assessment should be made of possible iatrogenic spread of sporadic and variant CJD after surgery to the retina or optic nerve.
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