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a Comparison of detection rate of three methods. Unused: antibiotics unused before sampling; used: antibiotics used before sampling; Three methods a, b and c have statistical difference. a, b and c are statistically different in pairs, and there is no statistical difference when the logo letters are the same. b Comparison of the detection rate of antibiotic use among the three methods. P values of CSF culture, blood culture and mNGS were 0.247, 0.06, 1, respectively
