First, the researchers put together a case definition.

首先，研究人员整理出一个案例定义。

Case definitions are characteristics that could indicate whether someone has a disease, like its typical symptoms, signs, or clinical test results.

病例定义是可以表明某人是否患有疾病的特征，如其典型症状、体征或临床测试结果。

For new diseases, case definitions tend to start out broad and exploratory, and then become more specific as we learn more about them.

对于新的疾病，病例定义往往开始时是宽泛的和探索性的，然后随着我们对它们了解的更多而变得更加具体。

However, whether the adult CDC case definition can be applied to children and adolescents is debatable.

然而，CDC 成人病例定义是否可以适用于儿童和青少年尚存在争议。