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The bare essentials
Infections of the nervous system
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    CSF:plasma glucose

    Although it is true that, in patients with suspected meningitis, a CSF:plasma glucose of >0.5 suggests a viral aetiology(1), underrecognition of the fact that the ratio may sometimes fall below 0.5 has led to inclusion of a CSF:plasma ratio > 0.5 among the "clinical case definitions" of aseptic meningitis(2), notwithstanding the fact that CSF:plasma glucose ratios below 0.5(and even as low as 0.26) may be encounte...

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