We hypothesized that regulatory T cells (Tregs) could play a beneficial role during HIV infection by controlling HIV replication in conventional T cells (Tcons). Purified Tregs and Tcons from healthy donors were activated separately. Tcons were infected with the X4 or R5 HIV strains and cultured with or without autologous Tregs. Coculture of Tcons and Tregs resulted in a dose-dependent inhibition of Tcon infection, which was significant when a 1:1 Treg:Tcon ratio was used. Treg suppression of HIV infection was largely mediated by contact-dependent mechanisms. Blockage of cytotoxic T-lymphocyte–associated antigen-4 did not significantly reduce Treg function. In contrast, Tregs acted through cAMP-dependent mechanisms, because the decrease of cAMP levels in Tregs, the blockade of gap junction formation between Tregs and Tcons, the blockage of CD39 activity, and the blockage of protein kinase A in Tcons all abolished Treg-mediated suppression of HIV replication. Our data suggest a complex role for Tregs during HIV infection. Although Tregs inhibit specific immune responses, their inhibition of HIV replication in Tcons may play a beneficial role, particularly during early HIV infection, when the effector immune cells are not yet activated. Such a protective role of Tregs could have a profound impact on infection outcome.

Retention in preexposure prophylaxis (PrEP) care is critical to elimination of human immunodeficiency virus. We reviewed all Howard Brown Health patients receiving PrEP (n = 5583) from 2012 to 2017. Among those with 12 months of follow-up, 43% remained in care, yet only 15% had all 4 quarters with a PrEP visit. Insurance status and comorbid conditions were drivers of retention in care.

This study uses electronic medical record data to describe monkeypox infections after a single dose of Modified Vaccinia Ankara-Bavarian Nordic vaccine, a live, nonreplicating vaccine indicated for prevention of smallpox and monkeypox infection in adults.

Background: Increased preexposure prophylaxis (PrEP) uptake among black men who have sex with men and black transgender women (BMSM/TW) is needed to end the HIV epidemic. Embedding a brief intervention in network services that engage individuals in HIV transmission networks for HIV/ sexually transmitted infections testing may be an important strategy to accelerate PrEP uptake. Setting: Partner Services PrEP study is a pilot, randomized, control trial to improve linkage to PrEP care among BMSM/TW presenting for network services in Chicago, IL, from 2015 to 2017. Methods: BMSM/TW (N = 146) aged 18–40 years were recruited from network services (partners services and social network strategy services). Intervention participants developed an individualized linkage plan based on the information–motivation–behavioral skills model and received minibooster sessions. Control participants received treatment as usual. Sociodemographic, behavioral, and clinical factors were examined at baseline and 3- and 12-month postintervention. Intent-to-treat analyses examined linkage to PrEP care within 3-month postintervention (primary outcome). Secondary outcomes were PrEP initiation, time to linkage to PrEP care, and time to PrEP initiation. Results: Compared with control participants, a significantly greater proportion of the intervention participants were linked to PrEP care within 3 months (24% vs. 11%; P = 0.04) and initiated PrEP (24% vs. 11%; P = 0.05). Among those linked to PrEP care within the study period, intervention participants were linked significantly sooner than control participants [median (interquartile range) days, 26.5 (6.0–141.8) vs. 191.5 (21.5–297.0); P = 0.05]. Conclusion: Study results support the preliminary efficacy of Partner Services PrEP to improve linkage to PrEP care and PrEP initiation among BMSM/TW.

Analysis of blood samples collected over 20 years suggests substantial underestimation of this virus in this country.