在开展此类研究中要有明确的病例定义。
为什么要使用病例定义？
什么是病例定义？
根据以下报告的狂犬病例数据，哪些病例符合病例定义？
Some data from reported rabies cases. Which fit the case definitions?
麻疹病例定义为发烧、发疹伴以咳嗽、流涕或结膜炎等一种或多种症状。
A measles case was defined as fever and rash and one or more of cough, coryza or conjunctivitis.
乌干达北部的12个地区已经报告发生了总共226例临床病例定义符合病例，包括53例死亡病例。
A total of 226 cases compatible with the clinical case definition including 53 deaths have been reported by 12 districts in northern Uganda.
在呼吁各国加强结核控制—预防结核抗药性的关键—的同时，就极端耐药结核病例定义达成一致意见(见如下)。
Along with a call for countries to strengthen TB control - the key to preventing TB drug resistance - consensus was reached on an XDR-TB case definition (see below).
除上述病例之外以及在最近修订H5N1感染病例定义之后，世卫组织将增加印度尼西亚追溯自2005年6月和11月的这两例。
In addition to the above case and following the recent revision of case definitions for H5N1 infection, WHO is adding two cases in Indonesia, dating back to June and November of 2005.
一些科学家认为现在的疫情已满足6级的定义，此病已在美国各地大面积传播，且有近5000例确诊病例，也很容易在国际间传播。
Scientists could argue that the conditions for phase 6 have already been met, with extensive transmission across the US, which has nearly 5, 000 confirmed cases, and easy passage between countries.
《国际糖尿病》：当前，糖尿病足溃疡合并感染的定义仍无统一标准，在很多病例中我们并不清楚是否有抗生素使用的适应证。
International Diabetes: at present the definition of infection in diabetics with foot ulcers is arbitrary, and in many borderline cases we are uncertain whether antibiotic therapy is indicated.
产前诊断病例的定义为通过侵入性手术或妊娠产物(POC)获得的胎儿样品。
Prenatal cases are defined as a fetal sample obtained through either an invasive procedure or a product of conception (POC).
虽然许多种情况与死产有关，在许多病例中很难定义准确的病因。
Although several conditions have been linked to stillbirth, it is difficult to define the precise etiology in many cases.
虽然许多种情况与死产有关，在许多病例中很难定义准确的病因。
Although several conditions have been linked to stillbirth, it is difficult to define the precise etiology in many cases.
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