Low agreement and frequent invalid controls in two SARS-CoV-2 T-cell assays in people with compromised immune function.

T-cell response plays an important role in SARS-CoV-2 immunogenicity. For people living with HIV (PWH) and solid organ transplant (SOT) recipients there is limited evidence on the reliability of commercially available T-cell tests. We assessed 173 blood samples from 81 participants (62 samples from 35 PWH; 111 samples from 46 SOT recipients [lung and kidney]) with two commercial SARS-CoV-2 Interferon-γ (IFN-γ) release assays (IGRA; SARS-CoV-2 IGRA by Euroimmun, and IGRA SARS-CoV-2 by Roche).

Late re-engagement into HIV care among adults in the Swiss HIV Cohort Study.

Introduction: Little is known about the clinical status of persons with HIV (PWH) who re-engage in care after an interruption. We evaluated the immunological and clinical characteristics of individuals re-engaging in care within the Swiss HIV Cohort Study.

Methods: Participants who re-engaged in care after an interruption >14 months with a viral load ≥100 copies/mL were classified as having interrupted ART.

HIV-1 low-level viremia predicts viral failure in participants on antiretroviral therapy in the Swiss HIV Cohort Study.

Background: Most individuals on combination antiretroviral therapy (ART) have HIV plasma viral loads below the limit of detection. However, episodes of low-level viremia (LLV) are observed in subsets of individuals, risk factors and clinical significance of which remain debated.

Methods: We included participants enrolled in the Swiss HIV Cohort Study, starting ART between July 1999 and April 2023, with HIV RNA <200 copies/ml six months post ART initiation.

Transcriptional profile of infection in people living with HIV.

In people with HIV-1 (PWH), (MTB) infection poses a significant threat. While active tuberculosis (TB) accelerates immunodeficiency, the interaction between MTB and HIV-1 during asymptomatic phases remains unclear. Analysis of peripheral blood mononuclear cells (PBMC) transcriptomic profiles in PWH, with and without controlled viral loads, revealed distinct clustering in MTB-infected individuals.