绝大多数病例的病因(90至95姊)是未知的，非细菌性的。

The vast majority (90 to 95 percent) of cases are of unknown, nonbacterial causes.

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细菌性腹泻和非细菌性腹泻病人的临床表现没有明显差别。

There was no significant difference between the clinical symptoms of bacterial and nonbacterial diarrhea.

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他们体检后预测非细菌性脑膜炎的发生率是98％，基本准确。

The set of information they tested predicted which cases are likely not bacterial with 98 per cent accuracy.

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