2岁小儿，2个月前患麻疹，1个月来咳嗽，发热，1周来嗜睡，间断呕吐。査体：体温38.90C,嗜睡，营养差，颈抵抗（+),心、肺、腹无异常。脑脊液WBC150x106/L，单核0.65,糖2.24mmol/L，PPD试验阴性。此患儿PPD(-)的原因是

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