Geographical Disparities in HIV Seroprevalence Among Men Who Have Sex with Men and People Who Inject Drugs in Nigeria: Exploratory Spatial Data Analysis.

BACKGROUND: The assessment of geographical heterogeneity of HIV among men who have sex with men (MSM) and people who inject drugs (PWID) can usefully inform targeted HIV prevention and care strategies. OBJECTIVE: We aimed to measure HIV seroprevalence and identify hotspots of HIV infection among MSM and PWID in Nigeria. METHODS: We included all MSM and PWID accessing HIV testing services across 7 prioritized states (Lagos, Nasarawa, Akwa Ibom, Cross Rivers, Rivers, Benue, and the Federal Capital Territory) in 3 geographic regions (North Central, South South, and South West) between October 1, 2016, and September 30, 2017. We extracted data from national testing registers, georeferenced all HIV test results aggregated at the local government area level, and calculated HIV seroprevalence. We calculated and compared HIV seroprevalence from our study to the 2014 integrated biological and behavioural surveillance survey and used global spatial autocorrelation and hotspot analysis to highlight patterns of HIV infection and identify areas of significant clustering of HIV cases. RESULTS: MSM and PWID had HIV seroprevalence rates of 12.14% (3209/26,423) and 11.88% (1126/9474), respectively. Global spatial autocorrelation Moran I statistics revealed a clustered distribution of HIV infection among MSM and PWID with a <5% and <1% likelihood that this clustered pattern could be due to chance, respectively. Significant clusters of HIV infection (Getis-Ord-Gi* statistics) confined to the North Central and South South regions were identified among MSM and PWID. Compared to the 2014 integrated biological and behavioural surveillance survey, our results suggest an increased HIV seroprevalence among PWID and a substantial decrease among MSM. CONCLUSIONS: This study identified geographical areas to prioritize for control of HIV infection among MSM and PWID, thus demonstrating that geographical information system technology is a useful tool to inform public health planning for interventions targeting epidemic control of HIV infection.

Effect of community treatment initiative on antiretroviral therapy uptake among linkage-resistant people living with HIV in Northern Nigeria.

BACKGROUND: Community Treatment Initiative (CTI) was developed in northern Nigeria as an intervention to link a cohort of people living with HIV (PLHIV) who refused antiretroviral treatment through a conventional linkage method to care and treatment. The CTI attempted to take treatment to PLHIV in the community. METHODS: This was a non-control interventional study that evaluated the proportion of linkage-resistant PLHIV linked to treatment through the CTI in nine geographical areas. Data were collected between October and December 2015. Linkage-resistant PLHIV were identified and linked to treatment using the CTI. Data were analyzed using Excel and IBM SPSS version 20.0. The simple proportion was used to estimate the linkage-resistant PLHIV who were eventually linked and retained in care and who ultimately achieved virological suppression (viral load <1000 copies/ml). The Chi-square test was used and the level of significance set at a p-value of <0.05. RESULTS: An estimated 541 (20%) PLHIV (239 (44.2%) male, 302 (55.8%) female) seen from October to December 2015 refused linkage to treatment. This was statistically significant at a p-value of <0.0001. Three hundred and seventy-seven (69.7%) of the PLHIV who refused linkage to treatment eventually accepted treatment using an alternative community treatment method; this was significant (p<0.0001). The 6-month retention rate for PLHIV who accepted the alternative treatment method was 88.1% (n=332); this was significant (p<0.0001). Seventy-eight percent of those retained in care attained virological suppression. CONCLUSIONS: The CTI improved linkage to care and treatment for a cohort of linkage-resistant PLHIV. Focus on this cohort of linkage-resistant positive clients is required to achieve HIV epidemic control.

Effect of clients Strategic Index Case Testing on community-based detection of HIV infections (STRICT study).

BACKGROUND: Strategic Index Case Testing (STRICT), a form of partner notification service, was initiated to track, identify and notify sexual partners of people living with HIV (Index clients) with the sole aim of testing them to determine their HIV status and linking clients who are positive to Anti-Retroviral Therapy (ART). This research analyzed the HIV sero-prevalence among sexual partners of HIV positive clients using STRICT and determines the role of STRICT in HIV epidemic control. METHODS: This is a non-control Interventional study that determined the impact of Strategic Index Case Testing (STRICT) on detecting previously undiagnosed HIV infections among sexual partners of positive index clients. This study was conducted in seven Local Government Areas (LGAs) of Karu, Nasarawa, Lafia, Doma, AMAC, Bwari, and Ushongo. These LGAs were selected for HIV epidemic control due to projected high prevalence of HIV from previous program level data. HTS was offered to sexual partners of index PLHIV from facility and community within the LGAs. Index clients were PLHIV diagnosed from outreaches, hot spots set up in strategic places and Provider Initiated Testing and Counseling (PITC) in comprehensive and primary health care facilities. Newly diagnosed PLHIV and those already enrolled and commenced on ART from October 2015 to July 2016 were identified from source registers. These index clients were counseled on how to notify their sexual partners about their HIV status and on bringing them for HIV Testing and Counseling (HTS). Those unable to do so after a given period of time were assisted by health workers in informing their various sexual partners based on the confidential agreement and informed consent signed by the Index clients. FINDINGS: A total of 1277 index cases were counseled and interviewed with 879 index clients agreeing to disclosure, giving a disclosure rate of 68.3%. We identified 888 sexual partners from the interviews and traced 870 (97.9%) sexual contacts. A total of 741 (85.2%) of 870 sexual contacts traced were tested for HIV, out of which 378 (51%) tested positive using an HIV rapid test kit, and this was statistically significant at P Value=0.0254. A total of 348 (92.1%) out of 378 HIV positive sexual partners were immediately commenced on ART using the recommended UNAIDS Test and Treat approach to HIV epidemic control. INTERPRETATION: STRICT identifies the need for reaching out to sexual partners of index clients and providing them with HIV Testing Services (HTS) as they belong to a high risk priority population and also linking them to care and treatment. This group of people must be reached with HTS strategies in order to end the HIV epidemic as evidenced by high sero-prevalence of 51% among them.