ArticlePLoS neglected tropical diseases2025
T-cell activation and senescence in asymptomatic HIV/Leishmania infantum co-infection.
Article in PLoS neglected tropical diseases, 2025. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 4 papers.
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4 citing papers in PubMed.
- HIV associated immune aging among people living with HIV: implications for long-term antiretroviral therapy and potential HIV cure interventions in sub-Saharan Africa.Frontiers in immunology · 2026Review
- Phenotypic characterization of mucosal-associated invariant T cells in visceral leishmaniasis and HIV co-infection.Frontiers in immunology · 2026Article
- Revisiting the past in light of current knowledge on γδ T cells in leishmaniasis.Frontiers in immunology · 2026Review
- Assessment of asymptomaticFrontiers in medicine · 2025Article
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Abstract
backgroundLeishmania infantum can be an opportunistic pathogen, with an immunocompromised status increasing the risk of converting asymptomatic infection to symptomatic visceral leishmaniasis (VL). VL has approximately 5% fatality rate; and HIV coinfection (AIDS/VL) increases this risk. We hypothesized that, relative to those with HIV alone, people with co-infection would have altered T cell activation which could impact on the risk of VL.
methodsA cross-sectional study was performed between 2014 and 2016 to determine the prevalence of L. infantum infection in people living with HIV (PLHIV) residing in Brazil (n = 1,372). Subsequent incident cases of VL were ascertained from a public health database through 2018 and from a cohort of families with VL. Immune status of 69 participants was evaluated and comparisons made between those with and without HIV, with latent or with active Leishmania infection and those without HIV but with active or resolved Leishmania or T cell hypersensitivity to Leishmania antigen and healthy control subjects.
resultsA total of 24.2% of PLHIV had positive anti-IgG L. infantum antibodies. The relative risk of developing AIDS/VL was 2.27 (95% CI: 0.920 to 5.59; p = 0.07) to HIV/Leish coinfected subjects with positive leishmania serology compared to HIV subjects without leishmania serology. Poor adherence to antiretroviral therapy (p = 0.0008) or prior opportunistic infections (p = 0.0007) was associated with development of AIDS/VL in asymptomatic HIV/Leish. CD4+ and CD8+ T cells counts or viral load were similar between asymptomatic HIV/Leish and HIV subjects. However, activated CD8+CD38+HLA-DR+ T cells were higher in asymptomatic HIV/Leish than HIV. Likewise, senescent (CD57+) and PD1+ CD8+ T cells were higher in asymptomatic HIV/Leish than in AIDS/VL or HIV groups.
conclusionAlthough asymptomatic HIV/Leish subjects had CD4+ and CD8+ T cells similar to HIV alone, their CD8+T cells had increased activation and senescence which could contribute to risk of developing VL.
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