癌症患可能因化學治療、放射線治療或其他問題而造成嗜中性白血球減少。嗜中性 白血球減少患者的感染問題是必須立即處理，稍有疏忽即會造成菌血症，患者於感染初期時， 症狀可能並不明顯，但是適當的預防感染措施和評估指引，會讓我們儘速察覺到感染問題而 加以治療。

　　　　　There have been many advances in the treatment of cancer recently, but due to immunocompromised patients, serious infections continue to be a major source of morbidity and mortality. The patient may contract neutropenia as a result of chemotherapy, radiotherapy or other underlying diseases. Neutropenia is the most important factor, caused by infection of the cancer patient. It is regarded as an emergency situation requiring immediate action. If not detected early, infection will lead to sepsis and high mortality. The early symptoms of infection are not easily detected, but good guidelines for prevention and intervention will provide us with better information to control the early infection problem.