• Persons living with HIV (PHIV) attending St Marys' hospital were consented and recruited between April and December 2023, all had: • Undetectable viral load at time of recruitment • Previous virological failure with drug resistance associated mutations (DRAMs) identified in ≥1 RNA sequence(s) (except 3 controls) • Virological data were extracted from clinical records and anonymized • 5ml EDTA blood was collected and用研究代码标记•从Buffy Coat细胞中提取DNA•通过经过验证的下一代测序(NGS)方法测序的蛋白酶蛋白酶修复转录酶(Prot-RT),其临界值15%•前病毒DNA序列与累积的历史RNA基因型和临床史及临床史