Methods 179 patients with high fever, normal white blood cell count, whose chest X ray showed shadow, were analyzed according to the characters of SARS patients'chest X ray manifestation that we had summarized. 方法对同时具备发热、血象不高、胸部X线有异常改变的179例患者按照我们总结的SARS胸部X线特征性表现进行了临床分析。