再次应答能迅速产生效应是因为机体内有() ["被激活的巨噬细胞","一定水平的致敏淋巴细胞","记忆细胞的存在","初次应答的残留抗原","T淋巴细胞的存在"]
简述艾滋病的流行过程三环节。
某部位粘膜受抗原刺激后,无抗原诱导的其他粘膜部位是否同样产生抗原活化细胞() ["同样产生","不产生","不一定","微量产生","以上都不是"]
瓜蒌的主治病证有()。 ["肺热咳嗽","胸痹作痛","肠燥便秘","肺虚久咳","疮痈瘰疬"]
对人体来说细菌的菌体抗原属于() ["自身抗原","异种抗原","同种异型抗原","异嗜性抗原","半抗原"]
试述常见的医院感染各有哪些预防及处理措施。