Engagement in care promotes durable viral suppression among persons newly diagnosed with HIV infection.

We characterize the association between engagement in care and durable viral suppression among persons newly diagnosed with HIV infection. Persons newly diagnosed with HIV with unsuppressed viral loads when they initiated care at one of six HIV clinics in the US were observed for up to 24 months. We describe the percentage who achieved durable viral suppression and number of days to achieve durable viral suppression. These outcomes were examined by the proportion of scheduled primary care appointments kept and demographic variables. Overall, 62% of patients achieved durable viral suppression and it took 174 days for 50% of patients to reach the beginning of the event. As the proportion of kept medical appointments increased, the proportion who achieved durable viral suppression increased, with 84% of patients who kept >75% of their appointments achieving the outcome. Higher adherence to appointments shortened the time to the beginning of durable viral suppression. Age, race/ethnicity, and risk factor for acquiring HIV infection were correlated with the outcomes. Adherence to primary care appointments is strongly associated with achieving durable viral suppression in persons newly diagnosed with HIV. Identifying and addressing patient barriers and unmet needs may increase the number who achieve durable viral suppression.

Phylodynamic Analysis Complements Partner Services by Identifying Acute and Unreported HIV Transmission.

Tailoring public health responses to growing HIV transmission clusters depends on accurately mapping the risk network through which it spreads and identifying acute infections that represent the leading edge of cluster growth. HIV transmission links, especially those involving persons with acute HIV infection (AHI), can be difficult to uncover, or confirm during partner services investigations. We integrated molecular, epidemiologic, serologic and behavioral data to infer and evaluate transmission linkages between participants of a prospective study of AHI conducted in North Carolina, New York City and San Francisco from 2011-2013. Among the 547 participants with newly diagnosed HIV with polymerase sequences, 465 sex partners were reported, of whom only 35 (7.5%) had HIV sequences. Among these 35 contacts, 23 (65.7%) links were genetically supported and 12 (34.3%) were not. Only five links were reported between participants with AHI but none were genetically supported. In contrast, phylodynamic inference identified 102 unreported transmission links, including 12 between persons with AHI. Importantly, all putative transmission links between persons with AHI were found among large clusters with more than five members. Taken together, the presence of putative links between acute participants who did not name each other as contacts that are found only among large clusters underscores the potential for unobserved or undiagnosed intermediaries. Phylodynamics identified many more links than partner services alone and, if routinely and rapidly integrated, can illuminate transmission patterns not readily captured by partner services investigations.