Collins Chinese Dictionary Plus (3rd edition), 2011:
免疫 miǎnyì 名
immunity
- 这(這)位病人的免疫系统(統)受到了破坏(壞)。 Zhè wèi bìngrén de miǎnyì xìtǒng shòudàole pòhuài. This patient's immune system has been destroyed.