CCR5在正常免疫中的作用尚不清楚[25],《複雜疾病遺傳學》(Genetics of Complex Disease)這一本書籍指出:「一般而言,CCR5並不會影響免疫反應,但它在對西尼罗河病毒感染的免疫反應中扮演重要的角色」[26]。CCR5-Δ32基因虽对部分艾滋病具有免疫作用,但一篇2015年的綜述指其与多发性硬化相关[27],不過在整體研究中它跟自體免疫性疾病的關係存有矛盾[28]。其跟腫瘤的關係則欠詳細記錄[29]。此外CCR5-Δ32可能會使携带者在感染西尼罗河病毒後出現更嚴重的神經系统疾病[26]。
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