https://orcid.org/0000-0002-8280-2810
ABSTRACT
The goals of this study were to assess retention on antiretroviral therapy (ART) and to identify predictors of loss to follow-up (LTFU) among people living with HIV (PLHIV) in Senegal. HIV-positive individuals presenting for initiation of ART in Dakar and Ziguinchor were enrolled and followed for 12 months. Data were collected using interviews, clinical evaluations, laboratory analyses, chart review, and active patient tracing. Of the 207 individuals enrolled, 70% were female, 32% had no formal education, and 28% were severely food insecure. At the end of the follow-up period, 58% were retained on ART, 15% were deceased, 4% had transferred care, 5% had migrated, and 16% were lost to follow-up. Enrollment in Ziguinchor (OR 2.71 [1.01-7.22]) and severe food insecurity (OR 2.55 [1.09-5.96]) were predictive of LTFU. Sex, age, CD4 count, BMI <18.5, country of birth, marital status, number of children, household size, education, consultation with traditional healers, transportation time, and transportation cost were not associated with LTFU. The strongest predictor of severe food insecurity was lack of formal education (OR 2.75 [1.30-5.80]). Addressing the upstream drivers of food insecurity and implementing strategies to enhance food security for PLHIV may be effective approaches to reduce LTFU and strengthen the HIV care cascade in the region.
Introduction
According to UNAIDS, progress towards the 90-90-90 targets in West and Central Africa has been slow compared to other regions (UNAIDS, Citation2020). Among the 4.9 million people living with HIV (PLHIV) in West and Central Africa in 2019, 68% knew their HIV status, 58% were receiving antiretroviral therapy (ART), and 45% had suppressed viral loads. Although 13% of PLHIV globally live in West and Central Africa, 20% of AIDS-related deaths in 2019 occurred in the region.
The second UNAIDS 90-90-90 target states that 90% of all people diagnosed with HIV infection will receive sustained ART, which is predicated on retention in care (UNAIDS, Citation2014). Previous studies of retention on ART among PLHIV have found that loss to follow-up (LTFU) rates are high in West Africa (Ekouevi et al., Citation2010; Fox & Rosen, Citation2015; Haas et al., Citation2018); however, prospective studies to identify risk factors for LTFU among PLHIV in West Africa are limited.
Addressing weaknesses along the entire continuum of care, including barriers to sustained ART, is critical to interrupting transmission, preventing mortality, and ending the HIV epidemic. The aims of this study were to assess retention on ART and to identify predictors of LTFU among a prospective cohort of PLHIV in Senegal, West Africa.
Methods
This study was conducted at the Services des Maladies Infectieuses et Tropicales, CHNU-Fann in Dakar and the Centre de Santé de Ziguinchor, located in the Casamance Region. Participants were enrolled from April 2017 to April 2018 and were followed for a period of 12 months. All HIV-positive individuals initiating ART through the Senegalese Antiretroviral Drug Access Initiative who provided informed consent were eligible for enrollment. For participants <18 years of age, consent was obtained from their legal guardian. Study procedures were approved by the University of Washington Institutional Review Board and the Senegal Comité National d’Ethique pour la Recherche en Santé.
Data were collected using interviews, clinical evaluations, laboratory analyses, and chart review. Sociodemographic characteristics and health seeking behaviors were determined using enrollment interviews. Baseline nutritional status, WHO clinical stage, CD4 cell count, and HIV associated characteristics were determined at enrollment using clinical evaluations, lab analyses, and chart review. Food insecurity was determined at enrollment, month 6, and month 12 using the Household Food Insecurity Access Scale (HFIAS) (Coates et al., Citation2007). “Not food insecure” was defined as a HFIAS score of 1 on a scale of 1-4, “food insecure” was defined as a HFIAS score of 2-4, and “severely food insecure” was defined as a HFIAS score of 4.
Outcomes were determined at the end of the 12 month follow-up period. “Retained on ART” was defined as alive, retained in care, and receiving ART as determined by patient report and the medical record. Medical records and family report were used to ascertain mortality. Patients who had no contact with the clinic for >6 months were traced by phone call or home visit, and were classified as deceased, transferred care to another clinic, migrated, or lost to follow-up. Patients were considered lost to follow-up if they had no contact with the clinic for >6 months (Chi et al., Citation2011; Grimsrud et al., Citation2013) and were alive but not retained in care or if they could not be traced. The primary outcome for this study was loss to follow-up; the comparison group included those retained in care at the study clinic, transferred to another clinic, and migrated.
Data were analyzed using SPSS Statistics 26. Descriptive analysis was performed for all variables. Chi-square and Fisher’s Exact tests were used to identify differences in patient characteristics between individuals in Dakar versus Ziguinchor. The Mann–Whitney U test was used to identify differences in medians between groups. Logistic regression was used to identify predictors of LTFU and severe food insecurity. Variables that were significantly associated with LTFU or severe food insecurity using simple regression were included in the multiple logistic regression models. Individuals known to be deceased and the individual who withdrew from care were excluded from the LTFU regression model. Missing data were excluded from analysis. P-values <0.05 were considered significant.
Results
We enrolled 207 HIV-positive individuals, of which 84 (41%) were enrolled in Dakar and 123 (59%) were enrolled in Ziguinchor (). More than two-thirds of participants (70%) were female and the median age was 37 years (IQR 31-46). The median baseline CD4 count was 181 cells/mm3 (IQR 63-382). Among non-pregnant participants ≥18 years of age, 41% had a BMI <18.5.
Table 1. Characteristics of HIV-infected participants presenting for HIV care and ART initiation in Senegal, 2018–2019.
The majority of participants (80%) were born in Senegal. Nearly one third of participants had no formal education and fewer than 30% had received any education beyond primary school. Only 61% of women had received any formal education versus 86% of men (p < 0.01), and only 27% of women had received any education beyond primary school versus 36% of men (p = 0.01). The majority of participants (86%) were unemployed. Approximately two thirds of participants had some form of food insecurity at their most recent study encounter and 28% were severely food insecure; a greater percentage of participants in Ziguinchor were severely food insecure compared to Dakar (35% vs. 17%, p = 0.01). Seeking care from traditional healers was reported by 36% of all participants and was more common in Ziguinchor (43% vs. 26%, p = 0.02). Individuals in Dakar spent more time traveling to and from clinic (median 240 min vs. 40 min, p < 0.01), while individuals in Ziguinchor spent more on the cost of transportation ($1.74 vs. $1.39, p < 0.01).
At the end of the 12 month follow-up period, 120 individuals (58%) were alive and retained on ART at the study clinic, 30 individuals (15%) were deceased, 8 (4%) had transferred care, 11 (5%) had migrated, and 33 (16%) were lost to follow-up. Four individuals (2%) were retained in care but were not receiving ART. One participant withdrew from care <24 h after enrollment in order to seek care from a traditional healer, and was not traced. In Ziguinchor, 22% of participants were lost to follow-up compared to 7% of participants in Dakar (p < 0.01). Of the 11 individuals who had migrated, 1 moved to France, 2 went to the Gambia, and 8 returned to Guinea-Bissau. Excluding individuals who were deceased and those who had migrated or transferred, 75.9% of participants were retained on ART at 12 months (91.5% in Dakar and 63.2% in Ziguinchor).
Enrollment at the Ziguinchor site (OR 2.71, 95% CI 1.01-7.22; p = 0.047) and severe food insecurity (OR 2.55, 95% CI 1.09-5.96; p = 0.03) were predictive of LTFU (). Sex, age, baseline CD4 cell count, BMI <18.5, country of birth, marital status, number of children, household size, education, seeking care from traditional healers, transportation time to clinic, and transportation cost were not associated with LTFU. Individuals enrolled at the Ziguinchor site (OR 2.66, 1.34-5.29; p = 0.01), women (OR 2.37, 1.10-5.10; p = 0.03), and those without any formal education (OR 3.51, 1.75-7.04; p < 0.01) had greater odds of severe food insecurity using simple logistic regressions (). In the multiple regression model, the only significant predictor of severe food insecurity was lack of any formal education (OR 2.75, 95% CI 1.30-5.80; p = 0.01).
Table 2. Logistic regressions showing predictors of loss to follow-up at one year among HIV-infected participants initiating ART in Senegal.
Table 3. Logistic regressions showing predictors of severe food insecurity among HIV-infected participants initiating ART in Senegal.
Discussion
In this prospective longitudinal study, we evaluated factors that we hypothesized could contribute to LTFU, and traced patients who were not retained in care in order to refine our understanding of patient outcomes. We found that retention on ART is substantially lower than the UNAIDS target, particularly among individuals enrolled in Ziguinchor, and severe food insecurity is a strong predictor of LTFU.
Food security exists when people have physical, social and economic access to sufficient, safe and nutritious food that meets their dietary needs and food preferences for an active and healthy life (Food and Agricultural Organization of the United Nations, Citation2009; Food and Agricultural Organization of the United Nations, Citation2019). The four dimensions of food security are food availability, access, utilization, and stability over time (Food and Agricultural Organization of the United Nations, Citation2019; Benzekri et al., Citation2017). The right to adequate food and freedom from hunger are recognized as basic human rights in the Universal Declaration of Human Rights (Food and Agricultural Organization of the United Nations, Citation1998; Universal Declaration of Human Rights, General Assembly of the United Nations, Citation1948), and ending hunger and achieving food security are targets of goal 2 of the United Nations Sustainable Development Goals (United Nations, Citation2015).
Our previous work has shown that the majority of PLHIV in Senegal are food insecure (Benzekri et al., Citation2015). The mechanisms through which food insecurity can contribute to poor HIV outcomes are mediated through vulnerabilities along the entire HIV continuum of care. Food insecurity can contribute to increased risk of HIV acquisition through high-risk behaviors and coping strategies (Chop et al., Citation2017; Weiser et al., Citation2007; Willie et al., Citation2018). Food insecurity contributes to poor adherence to ART when individuals choose not to take ART due to hunger and lack of food to take with their medications (Au et al., Citation2006; Benzekri et al., Citation2015; Hardon et al., Citation2007; Merten et al., Citation2010; Musumari et al., Citation2013; Nagata et al., Citation2012; Weiser et al., Citation2010), when they are confronted with the competing demands of paying for transportation costs and medical expenses or purchasing food (Merten et al., Citation2010; Tuller et al., Citation2010; Weiser et al., Citation2010), or when time spent earning wages or performing agricultural work is prioritized over time spent traveling to clinic and waiting for care. As a barrier to ART adherence (Singer et al., Citation2015; Young et al., Citation2014), food insecurity can contribute to virologic failure (Aibibula et al., Citation2017), which increases risk of HIV transmission. Food insecurity also has the potential to contribute to vertical transmission when it acts as a barrier to uptake of prevention of maternal to child transmission services (McCoy et al., Citation2015). The high prevalence of food insecurity among PLHIV in Senegal and its role as a driver of poor outcomes across the HIV care cascade, suggest that strategies to address food insecurity will be critical to achieving the 90-90-90 targets and ending the HIV epidemic.
Our findings suggest that there is a substantial gap in progress towards achieving the second 90-90-90 target in Senegal and reveal important regional differences in retention in care. We found that loss to follow-up was higher among individuals in Ziguinchor, located in the Casamance Region. The Casamance Region, which recently emerged from a decades long war for independence (TNH, Citation2015), has been the most severely affected by the HIV epidemic and has the highest prevalence of food insecurity in the country (World Food Program, Citation2014). The longstanding civil conflict, which included the extensive use of landmines, disrupted social structures and agricultural and economic development (Analyses et Cartographie de la Vulnérabilité au VIH - Rapport de la région de Ziguinchor, Citation2013; TNH, Citation2015). Although the Casamance has the highest prevalence of HIV in the country, this is the first study to evaluate retention in care among PLHIV in the region.
Male sex, younger age, and indicators of advanced HIV disease have been associated with LTFU in a number of studies conducted in sub-Saharan Africa, including the few studies conducted in West Africa (Agbaji et al., Citation2015; Alhaj et al., Citation2019; Aliyu et al., Citation2019; Arnesen et al., Citation2017; Asiimwe et al., Citation2015; Bekolo et al., Citation2013; Bilinski et al., Citation2017; Dalhatu et al., Citation2016; Ekouevi et al., Citation2010; Geng et al., Citation2016; Jespersen et al., Citation2016; Nordentoft et al., Citation2017; Nsanzimana et al., Citation2015; Ochieng-Ooko et al., Citation2010; Saka et al., Citation2013; Sifa et al., Citation2019; Tsague et al., Citation2008; Tweya et al., Citation2018; Wringe et al., Citation2018). In our study, these factors were not predictors of LTFU. The absence of an association between advanced disease and LTFU in this study may be attributable to the inclusion of patient tracing, which minimized the number of deceased patients that might otherwise have been misclassified as lost to follow-up.
Social and structural barriers to retention in care that have been identified previously include lower educational level (Agbaji et al., Citation2015; Dalhatu et al., Citation2016), unemployment (Mekonnen et al., Citation2019), being unmarried (Agbaji et al., Citation2015; Asiimwe et al., Citation2015; Nsanzimana et al., Citation2015), transportation time or distance to clinic (Bekolo et al., Citation2013; Bilinski et al., Citation2017; Geng et al., Citation2016; Ochieng-Ooko et al., Citation2010) and transportation costs (Hardon et al., Citation2007; Tuller et al., Citation2010). Our findings indicate that despite the immense potential barriers confronted by HIV-infected individuals in Senegal, including lack of access to education, unemployment, and lengthy travel times, these factors do not directly contribute to LTFU. Rather, our study highlights a potential pathway by which lack of formal education is a major risk factor for severe food insecurity, which subsequently contributes to poor retention in care. Poor retention in care and interruptions in ART increase the risk of virologic failure, ongoing HIV transmission, and death (Bangsberg et al., Citation2001; Cohen et al., Citation2016; Donnell et al., Citation2010; Fox & Rosen, Citation2015; Hogg et al., Citation2002; Nachega et al., Citation2007; Thompson et al., Citation2012; Turner, Citation2002).
Previous studies have suggested that seeking care from traditional healers and the use of traditional medicine may contribute to poor retention in care and interruption of ART (Dahab et al., Citation2010; Merten et al., Citation2010; Tong et al., Citation2018; Unge et al., Citation2011). We previously reported an association between seeking care from traditional healers and presentation with advanced HIV disease in Senegal (Benzekri et al., Citation2019). In this study, we explored whether individuals who sought care from traditional healers would be less likely to remain in care. Although traditional healer use was reported by more than a third of individuals, we did not find an association between traditional healer use and loss to follow-up. Given the high prevalence of traditional healer use in this population, the implications of concurrent use of ART and traditional medicine warrant further investigation.
Our study demonstrates the importance of enhanced monitoring and evaluation of programmatic data, including active patient tracing, in order to obtain an accurate understanding of the state of the HIV care cascade in Senegal. The primary limitations of our study were evaluation of only two HIV clinics in Senegal, small sample size, missing data, and incomplete data regarding rates of viral suppression. Future studies which include viral load monitoring would contribute to our understanding of the impact of food insecurity on HIV outcomes in this region.
Conclusion
LTFU is common in our study population and is associated with severe food insecurity. Addressing the upstream drivers of food insecurity and implementing strategies to enhance food security for PLHIV may be effective approaches to reduce LTFU and strengthen the HIV care cascade.
Acknowledgements
The authors would like to thank the study participants and the staff of the Services des Maladies Infectieuses et Tropicales and the Centre Régional de Recherche et de Formation à la Prise en Charge Clinique, Centre Hospitalier Universitaire de Fann and the Centre de Santé de Ziguinchor.
Disclosure statement
No potential conflict of interest was reported by the author(s).
Additional information
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References
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