Division Laboratory criteria
United Kingdom
At least one of the following four:
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Isolation of Neisseria meningitidis from a normally sterile site, including purpuric skin lesions
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Detection of Neisseria meningitidis nucleic acid from a normally sterile site, including purpuric skin lesions
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Detection of Neisseria meningitidis antigen in CSF
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Detection of gram negative stained diplococcus in CSF