Browsing by Author "Galiwango, Ronald M."

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    Evaluation of current rapid HIV test algorithms in Rakai, Uganda
    (Journal of virological methods, 2013) Galiwango, Ronald M.; Musoke, Richard; Lubyayi, Lawrence; Ssekubugu, Robert; Kalibbala, Sarah; Ssekweyama, Viola; Mirembe, Viola; Nakigozi, Gertrude; Reynolds, Steven J.; Serwadda, David; Gray, Ronald H.; Kigozi, Godfrey
    Rapid HIV tests are a crucial component of HIV diagnosis in resource limited settings. In Uganda, the Ministry of Health allows for both serial and parallel HIV rapid testing using Determine, Stat- Pak and Uni-Gold. In serial testing, a non-reactive result on Determine ends testing. The performance of serial and parallel algorithms with Determine and Stat-Pak test kits was assessed. A cross-sectional diagnostic test accuracy evaluation using three rapid HIV test kits as per the recommended parallel test algorithm was followed by EIA-WB testing with estimates of the performance of serial testing algorithm. In 2520 participants tested by parallel rapid algorithms, 0.6% had weakly reactive result. Parallel testing had 99.7% sensitivity and 99.8% specificity. If Stat-Pak was used as the first screening test for a serial algorithm, the sensitivity was 99.6% and specificity 99.7%. However, if Determine was used as the screening test, sensitivity was 97.3% and specificity 99.9%. Serial testing with Stat-Pak as the initial screening test performed as well as parallel testing, but Determine was a less sensitive screen. Serial testing could be cost saving.
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    HIV serologically indeterminate individuals: Future HIV status and risk factors
    (PLoS ONE, 2020) Mwinnyaa, George; Grabowski, Mary K.; Gray, Ronald H.; Wawer, Maria; Chang, Larry W.; Ssekasanvu, Joseph; Kagaayi, Joseph; Kigozi, Godfrey; Kalibbala, Sarah; Galiwango, Ronald M.; Ndyanabo, Anthony; Serwadda, David; Quinn, Thomas C.; Reynolds, Steven J.; Laeyendecker, Oliver
    Indeterminate HIV test results are common, but little is known about the evolution of indeterminate serology and itssociodemographic and behavioral correlates. We assessed future HIV serological outcomes for individuals with indeterminate results and associated factors in Rakai, Uganda. Methods 115,944 serological results, defined by two enzyme immunoassay (EIAs), among 39,440 individuals aged 15–49 years in the Rakai Community Cohort Study were assessed. Indeterminate results were defined as contradictory EIAs. Modified Poisson regression models with generalized estimating equations were used to assess prevalence ratios (PRs) of subsequent HIV serological outcomes and factors associated with HIV indeterminate results.
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    Immune milieu and microbiome of the distal urethra in Ugandan men: impact of penile circumcision and implications for HIV susceptibility
    (Microbiome, 2022) Galiwango, Ronald M.; Park, Daniel E.; Huibner, Sanja; Onos, Abigail; Aziz, Maliha; Roach, Kelsey; Anok, Aggrey; Nnamutete, James; Isabirye, Yahaya; Wasswa, John Bosco; Male, Deo; Kigozi, Godfrey; Tobian, Aaron A. R.; Prodger, Jessica L.; Liu, Cindy M.; Kaul, Rupert
    Coronal sulcus (CS) anaerobe abundance and IL-8 levels are linked to HIV acquisition, and are dramatically reduced after penile circumcision (PC). The distal urethra may be the site of some HIV acquisition before PC, and presumably most acquisition post PC. We describe the immune milieu and microbiome of the distal urethra in uncircumcised Ugandan men, and define the impact of PC. Participants consisted of HIV-negative, genital symptomfree adult Ugandan men undergoing PC (n = 51). Urethral and coronal sulcus swabs were collected at baseline and at 6- and 12-months post-PC. Soluble immune factors were quantified by multiplex ELISA, and bacterial abundance assessed by 16S rRNA qPCR and sequencing. Results: At baseline, the urethra was enriched compared to the CS for most cytokines (including IL-8 and MIP-1β) and soluble E-cadherin (sE-cadherin, an epithelial disruption marker), although CS levels of IL-1α and IL-1β were higher. Baseline total bacterial abundance was ≥ 20-fold higher in the CS than the urethra (median 27,100 vs. 1200 gene copies/swab, p = 0.001), and anaerobes comprised 58% of CS bacteria vs. 42% of urethral bacteria. PC did not alter urethral IL-8 (median 806 at baseline vs. 1130 pg/ml at 12 months; p = 0.062) and urethral sE-cadherin increased (113,223 vs. 158,385 pg/ml, p = 0.009), despite five- and sevenfold drops in total bacterial and anaerobe abundance after PC, respectively. However, PC dramatically reduced CS levels of sE-cadherin (15,843 vs. 837 pg/ml, p < 0.001) and most cytokines (IL-8; 34 vs. 3 pg/ml, p < 0.001), while reducing total bacterial and anaerobe abundance by 13-fold and 60-fold, respectively (both P ≤ 0.004). Conclusions: The urethra is immunologically rich with characteristics of an HIV-susceptible tissue site. However, PC had no impact on urethral immunology and may have reduced epithelial integrity, despite modest reductions in total bacteria and anaerobes, suggesting that HIV protection from PC is not mediated via immune or microbiome alterations in the urethra.