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Background: Human Immunodeficiency Virus (HIV) infection may alter antibody responses against periodontopathic bacteria, increasing the susceptibility for gingival and periodontal disorders in HIV-infected individuals. We describe the oral health of HIV-infected individuals receiving stable Antiretroviral Therapy (ART) and determine their association with serum anti-periodontopathic bacteria antibody level.

Background: The highest burden of disease from hepatitis C virus (HCV) is found in Southeast Asia, but our understanding of the epidemiology of infection in many heavily burdened countries is still limited. In particular, there is relatively little data on acute HCV infection, the outcome of which can be influenced by both viral and host genetics which differ within the region. We studied HCV genotype and IL28B gene polymorphism in a cohort of acute HCV-infected patients in Southern Vietnam alongside two other cohorts of chronic HCV-infected patients to better understand the epidemiology of HCV infection locally and inform the development of programs for therapy with the increasing availability of directly acting antiviral therapy (DAAs).Methods: We analysed plasma samples from patients with acute and chronic HCV infection, including chronic HCV mono-infection and chronic Human Immunodeficiency Virus (HIV)-HCV coinfection, who enrolled in four epidemiological or clinical research studies. HCV infection was confirmed with RNA testing. The 5’ UTR, core and NSB5 regions of HCV RNA positive samples were sequenced, and the genotype and subtype of the viral strains were determined. Host DNA from all HCV positive patients and age- and sex-matched non-HCV-infected control individuals were analysed for IL28B single nucleotide polymorphism (SNP) (rs12979860 and rs8099917). Geolocation of the patients were mapped using QGIS.Results: 355 HCV antibody positive patients were analysed; 54.6% (194/355) and 46.4% (161/355) were acute and chronic infections, respectively. 50.4% (81/161) and 49.6.4% (80/161) of chronic infections had HCV mono-infection and HIV-HCV coinfection, respectively. 88.7% (315/355) and 10.1% (36/355) of the patients were from southern and central regions of Vietnam, respectively. 92.4% (328/355) of patients were HCV RNA positive, including 86.1% (167/194) acute and 100% (161/161) chronic infections. Genotype could be determined in 98.4% (322/328) patients. Genotypes 1 (56.5%; 182/322) and 6 (33.9%; 109/322) predominated. Genotype 1 including genotype 1a was significantly higher in HIV-HCV coinfected patients compared to acute HCV patients [43.8% (35/80) versus 20.5% (33/167)], (p = Conclusion: HCV genotype 6 is highly prevalent in Vietnam and the high prevalence in treatment naïve chronic HCV patients may results from poor spontaneous clearance of acute HCV infection with genotype 6.

High levels of human immunodeficiency virus (HIV) DNA in peripheral blood mononuclear cells (PBMCs), and specifically within CD14+ blood monocytes, have been found in HIV-infected individuals with neurocognitive impairment and dementia. The failure of highly active antiretroviral therapy (HAART) to eliminate cognitive dysfunction in HIV may be secondary to persistence of HIV-infected PBMCs which cross the blood-brain barrier, leading to perivascular inflammation and neuronal injury. This study assessed brain cortical thickness relative to HIV DNA levels and identified, we believe for the first time, a neuroimaging correlate of detectable PBMC HIV DNA in subjects with undetectable HIV RNA. Cortical thickness was compared between age- and education-matched groups of older (>40 years) HIV-seropositive subjects on HAART who had detectable (N = 9) and undetectable (N = 10) PBMC HIV DNA. Statistical testing revealed highly significant (P < 0.001) cortical thinning associated with detectable HIV DNA. The largest regions affected were in bilateral insula, orbitofrontal and temporal cortices, right superior frontal cortex, and right caudal anterior cingulate. Cortical thinning correlated significantly with a measure of psychomotor speed. The areas of reduced cortical thickness are key nodes in cognitive and emotional processing networks and may be etiologically important in HIV-related neurological deficits.

Monocytes and macrophages serve as HIV-1 reservoirs and may indirectly lead to HIV-1-associated dementia via neurotoxic cytokine/chemokine production. It remains unknown if peripheral monocytes and macrophages are responsible for the presence of circulating and cerebral spinal fluid cytokine/chemokine. The purpose of this evaluation was to determine the relationship between inflammatory and chemoattractant cytokine/chemokine in the periphery and the CNS among individuals with HIV-1-associated dementia and normal cognition. To accomplish this, we utilized specimens from the Hawaii Aging with HIV Cohort to assay plasma, cerebral spinal fluid, and cultured peripheral monocyte and macrophage supernatant cytokine/chemokines from individuals with HIV-1-associated dementia and normal cognition by ELISA, relative real-time PCR, and protein macroarrays. To further characterize the activated cells that may be responsible for HIV-1-associated dementia, inverse-PCR was used to identify sites of viral integration. Different mediators of inflammation, and chemoattraction from monocyte and macrophage supernatants, plasma, and cerebral spinal fluid were identified in HIV-1-associated dementia versus normal cognition. The data suggest unique pathways leading to cytokine/chemokine release in the periphery versus the brain region. This may have implications in delineating a cause and effect in HIV-1-associated dementia pathogenesis.