complement fixation antibody

例句：

1. 1. The test detects the presence of a complement-fixing antibody in the patient's blood.
   该测试检测患者血液中是否存在补体固定抗体。
2. 2. This antibody is important for the immune system to recognize and neutralize pathogens.
   这种抗体对于免疫系统识别和中和病原体至关重要。
3. 3. The researcher found that the patient had developed a complement-fixing antibody against the virus.
   研究人员发现，这名患者已经产生了针对该病毒的补体固定抗体。