Children of a syndemic: co-occurring and mutually reinforcing adverse child health exposures in a prospective cohort of HIV-affected mother-infant dyads in Cape Town, South Africa.

INTRODUCTION: Several HIV-related syndemics have been described among adults. We investigated syndemic vulnerability to hazardous drinking (HD), intimate partner violence (IPV) and household food insecurity (HFIS) in breastfed children born without HIV in urban South Africa. We compared those who were perinatally HIV exposed (CHEU) to those who were not (CHU), under conditions of universal maternal antiretroviral therapy (ART) and breastfeeding. METHODS: A prospective cohort of pregnant women living with HIV (WLHIV), and without HIV, were enrolled and followed with their infants for 12 months postpartum (2013-2017). All WLHIV initiated antenatal efavirenz-based ART. Measurements of growth (∼3 monthly), infectious cause hospitalisation, ambulatory childhood illness (2-week recall) and neurodevelopment (BSID-III, measured at ∼12 months' age) were compared across bio-social strata using generalised linear regression models, with interaction terms; maternal data included interview-based measures for HD (AUDIT-C), IPV (WHO VAW) and HFIS. RESULTS: Among 872 breastfeeding mother-infant pairs (n = 461 CHEU, n = 411 CHU), WLHIV (vs. HIV negative) reported more unemployment (279/461, 60% vs. 217/411, 53%; p = 0.02), incomplete secondary education (347/461, 75% vs. 227/411, 55%; p < 0.0001), HD (25%, 117/459 vs. 7%, 30/411; p < 0.0001) and IPV (22%, 101/457 vs. 8%, 32/411; p < 0.0001) at enrolment; and HFIS at 12 months (45%, 172/386 vs. 30%, 105/352; p > 0.0001). There were positive interactions between maternal HIV and other characteristics. Compared to food secure CHU, the mean difference (95% CI) in weight-for-age Z-score (WAZ) was 0.06 (-0.14; 0.25) for food insecure CHU; -0.26 (-0.42; -0.10) for food secure CHEU; and -0.43 (-0.61; -0.25), for food insecure CHEU. Results were similar for underweight (WAZ < -2), infectious-cause hospitalisation, cognitive and motor delay. HIV-IPV interactions were evident for ambulatory diarrhoea and motor delay. There were HIV-HD interactions for odds of underweight, stunting, cognitive and motor delay. Compared to HD-unexposed CHU, the odds ratios (95% CI) of underweight were 2.31 (1.11; 4.82) for HD-exposed CHU; 3.57 (0.84; 15.13) for HD-unexposed CHEU and 6.01 (2.22; 16.22) for HD-exposed CHEU. CONCLUSIONS: These data suggest that maternal HIV-related syndemics may partly drive excess CHEU health risks, highlighting an urgent need for holistic maternal and family care and support alongside ART to optimise the health of CHEU.

Wildfires and COVID-19: syndemic impact on maternal and child health.

The prevailing COVID-19 pandemic and climate change-mediated wildfires can combine to impact maternal-child health, yet this connection remains understudied. To shape policies and design interventions to mitigate the combined effects of future global catastrophes, it is vital to holistically evaluate the impact of syndemics on maternal-child health.

Syndemic Conditions and Their Association with HIV/STI Sexual Risk Behaviors Among Transgender Women and Cisgender Men Sex Workers in Catalonia: The SexCohort Project.

BACKGROUND: Transgender women and cisgender men sex workers are vulnerable to HIV and sexually transmitted infections (STIs). This study aimed to explore in depth the prevalence of syndemic conditions and their association with the sexual risk behaviors for HIV/STI acquisition in cis men and trans women sex workers in Barcelona (Catalonia, Spain). METHOD: We conducted a study between 2014 and 2018 to determine whether syndemic conditions (frequent alcohol consumption and polydrug use (> 2) during sex with clients; experience of violence; and lack of healthcare access) are associated with HIV/STI sexual risk behaviors. A "syndemic index" was calculated based on the cumulative number of syndemic conditions (0 to 4). RESULTS: In the last year (2018), 78.8% of cisgender men and 68.1% of transgender women reported at least one syndemic condition. The most prevalent syndemic factor in both cisgender men and transgender women was violence (38.8% and 43.6% respectively). In multivariable analysis, an association was found between condomless anal sex and violence (aOR = 1.81), and frequent alcohol consumption and violence with reporting > 10 clients/week (aOR = 2.73 and 1.88, respectively). The higher the number of syndemic factors, the greater probability of having > 10 clients/week and reporting condomless anal sex with clients. CONCLUSION: Psychosocial conditions have a syndemic effect on risky sexual behaviors highlighting the need for a more holistic approach to HIV/STI prevention targeting these populations.

Association of syndemic conditions and quality of life among people living with HIV/AIDS.

The syndemics theory seeks to understand the effect of multiple synergic problems in promoting poor health outcomes. To disentangle which and how syndemic conditions affect the quality of life (QoL) may be important to improve well-being of people living with HIV/AIDS (PLWHA). This study evaluates the association between syndemic conditions and QoL among PLWHA. We performed a secondary analysis using data obtained between 2014 and 2017 among PLWHA under care in Rio de Janeiro, Brazil. The outcomes were the six QoL domains (physical, psychological, level of independence, social relationships, environmental, and spirituality) measured through the World Health Organization Quality of Life in HIV infection scale, abbreviated version (WHOQOL-HIV-BREF). The independent variables were demographic and clinical characteristics, syndemic conditions (binge drinking, compulsive sexual behavior, polysubstance use, intimate partner violence, and depression), and syndemics (two or more syndemic conditions simultaneously). Bivariate analysis (t-test and ANOVA) and linear regressions were performed for each quality-of-life domain. The analytical sample comprised 1530 participants, mostly male at birth (64%) and with median age of 43 years. The syndemic conditions most frequently observed were binge drinking (56%), IPV (13%), and depression (9%). Both individual syndemic conditions and syndemics were associated with worse QoL. In the multivariate analysis, positive screening for depression was associated with worse QoL in all domains. Polysubstance users presented worse QoL at social and environmental domains. Intimate partner violence was associated with worse QoL at environment domain while binge drinking was associated with worse scores in the physical domain. The presence of syndemics increased the likelihood of worse scores in the psychological, social, and environment domains. Our study expands the understanding of QoL in PLWHA, as it considers a holistic/integral, multifactorial, and synergistic approach to the determinants of QoL. Seeking strategies that target syndemics may be important to improve patient-centered outcomes in health.Abbreviations: HIV/AIDS: human immunodeficiency virus/acquired immunodeficiency syndromeWHO: World Health OrganizationQoL: quality of lifeHRQoL: health-related quality of lifePLWHA: people living with HIV/AIDScART: combined antiretroviral therapyIPV: intimate partner violenceINI/FIOCRUZ: Evandro Chagas National Institute of Infectious DiseasesOswaldo Cruz FoundationSRH: self-rated healthVL: viral loadCD4: CD4 cell countNIAAA: National Institute on Alcohol Abuse and AlcoholismCSBcompulsive sexual behaviorWHO-ASSIST: alcoholsmoking and substance involvement screening test developed by the World Health OrganizationPHQ-2: Patient Health Questionnaire-2.

A potential syndemic effect associated with symptoms of depression among men who have sex with men.

INTRODUCTION: Globally, depression rates are high among men who have sex with men (MSM). Multiple factors may interact synergistically to increase this risk. This analysis assessed the prevalence of symptoms of depression among MSM in Brazil and synergistic effects of several factors. METHODS: Cross-sectional study conducted in 12 cities using respondent-driven sampling. Sociodemographic and behavioral characteristics were collected. The PHQ-9 was used to screen for depression. Having moderate-severe depressive symptoms was compared to none-mild using logistic regression. The syndemic factor was a composite of hazardous alcohol use, sexual violence, and discrimination due to sexual orientation. Those with one to three of these factors were compared to those with none. RESULTS: The weighted prevalence of moderate-severe depressive symptoms was 24.9% (95%CI = 21.8-28.8) and 16.2%, 22.9%, 46.0% and 51.0% when none, one, two, or three syndemic factors were present, respectively, indicating a dose-response effect. Perception of HIV risk, high level of HIV knowledge, known HIV infection, and health self-rated as poor or very poor were also associated with depressive symptoms. CONCLUSION: The prevalence of moderate-severe depressive symptoms among MSM in Brazil is high, and selected factors act synergistically in increasing their prevalence. Public health policies should consider holistic depression prevention and treatment interventions for this population.

Re-engineering the Cypriot General Healthcare System for Syndemics.

To date in Cyprus, there is no dedicated "Quality Improvement" body or Public Health authority. The long-awaited general healthcare system (known as GeSy or GHS) has been completed, mid-stream of the COVID-19 pandemic. A recently proposed resilience plan in response to the lessons learnt from the pandemic was put forward by the Government of the Republic of Cyprus to strengthen the capacity of the GHS and support public health defense. The negotiator of GeSy and Health Minister 2015-2018 also provided his view that the health system needs a holistic transformation of service provision. Recognizing failures and thinking from a syndemogenesis perspective how the envisioned patient-centric healthcare delivery can be achieved, we propose that the public health response could also be linked to a politico-economic one in shielding GeSy. We make such case for a syndemic strategy (simultaneous management of COVID-19 and pre-existing epidemics on the island) and the development of the five-district model where each main district hospital is to complement the activities of the GHS through developing: 1. A training Center for training and sharing of best practices for COVID-19 and other public emergencies. 2. A public health body. 3. A quality improvement institute. 4. A commissioning center on planning and streamlining healthcare services. 5. A clinical trial platform. The rationale is based on the management literature and use of existing resources and capabilities for transforming the GeSy and generating value.

Policy Implications of Structural Violence and Syndemic Dynamics: A Lens for Addressing Latinx Immigrant Diabetes Health Disparities.

PURPOSE OF REVIEW: The purpose of this review is to explore using theoretical frameworks of structural violence and syndemics to understand Latinx health disparities with a focus on type 2 diabetes (T2D). We propose that combining these frameworks is a valuable approach for revealing complex root-cause dynamics and explaining the nuances of how and why health disparities exist. We discuss the importance of the relationship between T2D, fear, and stigma. RECENT FINDINGS: Immigration policy creates structural conditions that invite unauthorized immigration while simultaneously excluding undocumented immigrants from access to healthcare resources. Structural exclusion then breeds fear of immigration status disclosure and deportation and, in the highly politicized immigration context that has emerged over the past two decades, also assigns social sigma to immigration status. Undocumented immigrants lack access to healthcare and health insurance; they cannot afford state-of-the-art drugs, they tend to be socially isolated and lack social capital to navigate systems; they are financially limited by poverty and lack of resources, emotionally taxed by the experience of discrimination, humiliation, and language-related challenges; and they have a toxic immigration stress load in the form of multidimensional fear. Potential areas for policy change are identified. Type 2 diabetes (T2D) follows racial, ethnic, and class fault lines that reflect unequal social and structural dynamics. Latinx immigrants are at disproportionate risk and explaining immigrant T2D social geography requires a holistic lens.

Understanding the bigger picture: syndemic interactions of the immigrant and refugee context with the lived experience of diabetes and obesity.

BACKGROUND: Providing contextually appropriate care and interventions for people with diabetes and/or obesity in vulnerable situations within ethnocultural newcomer communities presents significant challenges. Because of the added complexities of the refugee and immigrant context, a deep understanding of their realities is needed. Syndemic theory sheds light on the synergistic nature of stressors, chronic diseases and environmental impact on immigrant and refugee populations living in vulnerable conditions. We used a syndemic perspective to examine how the migrant ethnocultural context impacts the experience of living with obesity and/or diabetes, to identify challenges in their experience with healthcare. METHODS: This qualitative participatory research collaborated with community health workers from the Multicultural Health Brokers Cooperative of Edmonton, Alberta. Study participants were people living with diabetes and/or obesity from diverse ethnocultural communities in Edmonton and the brokers who work with these communities. We conducted 3 focus groups (two groups of 8 and one of 13 participants) and 22 individual interviews (13 community members and 9 brokers). The majority of participants had type 2 diabetes and 4 had obesity. We conducted a thematic analysis to explore the interactions of people's living conditions with experiences of: 1) diabetes and obesity; and 2) healthcare and resources for well-being. RESULTS: The synergistic effects of pre- and post-immigration stressors, including lack of social network cultural distance, and poverty present an added burden to migrants' lived experience of diabetes/obesity. People need to first navigate the challenges of immigration and settling into a new environment in order to have capacity to manage their chronic diseases. Diabetes and obesity care is enhanced by the supportive role of the brokers, and healthcare providers who have an awareness of and consideration for the contextual influences on patients' health. CONCLUSIONS: The syndemic effects of the socio-cultural context of migrants creates an additional burden for managing the complexities of diabetes and obesity that can result in inadequate healthcare and worsened health outcomes. Consequently, care for people with diabetes and/or obesity from vulnerable immigrant and refugee situations should include a holistic approach where there is an awareness of and consideration for their context.

Comorbidities and Syndemics in the COVID-19 Age: Challenges and Opportunities for Bringing Separated Branches of Medicine Closer to Each Other.

The Corona Virus Disease 2019 (COVID-19) as a unique disaster has stressed the extreme importance of the three issues for medicine, society and humanity in general: comorbidity, pandemic and syndemic. There are many reasons why the study of comorbidities and syndemics of COVID-19 is of great importance for researchers, clinicians and health policy makers who are responsible for health care organization and funding in a bid to develop more effective and efficient prevention and treatment. Thinking about COVID-19 through a syndemics concept and taking biological, psychological, social and spiritual dimensions into account, physicians could be more effective in clinical practice and community-based interventions. The outcome of SARS-CoV-2 infection is determined by the virus-host interaction, with pathogenicity of SARS-CoV-2 being related to the presence of comorbid diseases. The risk for severe COVID-19 clinical manifestations and death increases with age of patients and comorbidity. General mechanisms of multi-system dysfunction and multi-organ damage reported in COVID-19 are probably related to ubiquitous expression of ACE2 in many tissues and its important role in the renin-angiotensin-aldosterone system (RAAS) functioning. Physicians all over the world should be aware of COVID-19 related comorbidities, multisystem disorders and syndemics, as well as treatment and preventive strategies. COVID-19 age is a right time to reconsider the state of science and practice in comorbidity medicine field from the both epistemological and treatment perspective. Comorbidities and multimorbidities are indifferent to medical specializations, so the integrative and complementary medicine is an imperative in the both education and practice. Shifting the paradigm from vertical and mono-morbid interventions to comorbidity, multimorbidity and multi-system disease approaches enhances effectiveness and efficiency of human resources utilization. The aim of this review is to summarize the theoretical concepts and clinical experience and research regarding comorbidity in general, and specifically related to the COVID-19 pandemic, syndemics and infodemic.

Epidemiology of Heart Failure: A Contemporary Perspective.

Designated as an emerging epidemic in 1997, heart failure (HF) remains a major clinical and public health problem. This review focuses on the most recent studies identified by searching the Medline database for publications with the subject headings HF, epidemiology, prevalence, incidence, trends between 2010 and present. Publications relevant to epidemiology and population sciences were retained for discussion in this review after reviewing abstracts for relevance to these topics. Studies of the epidemiology of HF over the past decade have improved our understanding of the HF syndrome and of its complexity. Data suggest that the incidence of HF is mostly flat or declining but that the burden of mortality and hospitalization remains mostly unabated despite significant ongoing efforts to treat and manage HF. The evolution of the case mix of HF continues to be characterized by an increasing proportion of cases with preserved ejection fraction, for which established effective treatments are mostly lacking. Major disparities in the occurrence, presentation, and outcome of HF persist particularly among younger Black men and women. These disturbing trends reflect the complexity of the HF syndrome, the insufficient mechanistic understanding of its various manifestations and presentations and the challenges of its management as a chronic disease, often integrated within a context of aging and multimorbidity. Emerging risk factors including omics science offer the promise of discovering new mechanistic pathways that lead to HF. Holistic management approaches must recognize HF as a syndemic and foster the implementation of multidisciplinary approaches to address major contributors to the persisting burden of HF including multimorbidity, aging, and social determinants of health.

"Violence and love and drugs it all goes hand in hand": A mixed methods analysis of the substance abuse, violence, and HIV/AIDS syndemic among women who use methamphetamine.

Background: The synergistic epidemics of substance use, violence, and HIV/AIDS, also known as the SAVA syndemic, disproportionately affects vulnerable women in the United States. Methamphetamine use is closely linked with physical and sexual violence, including intimate partner violence (IPV), which heightens women's vulnerability to HIV. This mixed methods study examined the prevalence and correlates of violence among women who use methamphetamine, (n = 209) enrolled in an HIV intervention study in San Diego, California. Methods: At baseline, 209 women completed an interviewer-administered computer-assisted survey. A sub set of women who reported lifetime IPV (n = 18) also participated in qualitative interviews to contextualize our understanding of patterns of violence over time. Results: In the overall cohort, reports of lifetime (66.0%) and past 2-month (19.6%) IPV were prevalent. Moreover, women reported lifetime physical only (27.3%), sexual only (6.2%), or both forms of violence (50.7%) by multiple perpetrators. Factors independently associated with lifetime IPV were having unprotected sex with a steady partner (odds ratio [OR]: 2.50, 95% confidence interval [CI]: 1.04, 6.00) and being high on methamphetamine during unprotected sex with a steady partner (OR: 2.56, 95% CI: 1.30, 5.09) within the past 2 months. Our qualitative narratives illuminated how IPV in women's steady relationships often reflects a culmination of violent victimization throughout their lifetime which is further exacerbated by methamphetamine use and sexual risk through gendered power dynamics. Conclusions: HIV prevention interventions should address the SAVA syndemic in a holistic manner, including the role of methamphetamine use in the context of women's abusive steady relationships.

Syndemics & syndemogenesis in COVID-19 and rheumatic and musculoskeletal diseases: old challenges, new era.

People with rheumatic and musculoskeletal diseases (RMDs) are facing several challenges during the COVID-19 pandemic, such as poor access to regular health services and drug shortages, particularly in developing countries. COVID-19 represents a syndemic, synergistic condition that interacts with and exacerbates pre-existing diseases such as RMDs, other co-morbidities and social conditions. The emerging evidence on both biological and non-biological factors implicated in worse outcomes in people with RMDs affected by the COVID-19 pandemic, whether infected by the virus or not, calls for the need to use more novel and holistic frameworks for studying disease. In this context, the use of a syndemic framework becomes particularly relevant. We appeal for a focus on the identification of barriers and facilitators to optimal care of RMDs in the context of the COVID-19 pandemic, in order to tackle both the pandemic itself and the health inequities inherent to it.

Evidence for the Confluence of Cigarette Smoking, Other Substance Use, and Psychosocial and Mental Health in a Sample of Urban Sexual Minority Young Adults: The P18 Cohort Study.

BACKGROUND: Sexual minority men (SMM) and transgender women (TW) are more likely to smoke cigarettes than heterosexual and cisgender peers, which may exacerbate existing disparities in mental and psychosocial health and substance use. PURPOSE: As few existing studies have examined the confluence of these factors, we sought to examine tobacco use in a diverse sample of SMM and TW and describe its relationship with other substance use and health. METHODS: Data were drawn from a study of syndemic conditions among SMM and TW, which included measures assessing tobacco use, substance use, and mental, psychosocial, and general health. RESULTS: A majority of the racially/ethnically and socioeconomically diverse sample (n = 665) reported ever smoking a cigarette, and more than half of them were current smokers. Current smoking was associated with more frequent recent substance use and poorer mental, psychosocial, and general health. In multivariable analyses, current smoking was predicted by more frequent substance use and more severe anxiety, when adjusting for demographic, substance use, and health factors. CONCLUSIONS: A syndemic approach to health conditions such as substance use, mental health, and psychosocial burden dictates a framework of interrelation and mutual exacerbation. In doing so, we found that current cigarette use was associated with more frequent alcohol and marijuana use and more severe anxiety, suggesting a confluence of cigarette smoking, other substance use, and mental health burden. We recommend a holistic approach to treating tobacco use in sexual and gender minority populations that addresses both substance use and the myriad psychosocial burdens that sexual and gender minority communities experience.

Syndemic Perspectives to Guide Black Maternal Health Research and Prevention During the COVID-19 Pandemic.

The coronavirus 2019 (COVID-19) pandemic and related policies have led to an unequal distribution of morbidity and mortality in the U.S. For Black women and birthing people, endemic vulnerabilities and disparities may exacerbate deleterious COVID-19 impacts. Historical and ongoing macro-level policies and forces over time have induced disproportionately higher rates of maternal morbidity and mortality among Black women and birthing people, and contemporary macroeconomic and healthcare policies and factors continue to hold particular consequence. These factors induce detrimental psychological, health, and behavioral responses that contribute to maternal health disparities. The COVID-19 pandemic is likely to disproportionately impact Black women and birthing people, as policy responses have failed to account for the their unique socioeconomic and healthcare contexts. The resulting consequences may form a 'vicious cycle', with upstream impacts that exacerbate upstream macro-level policies and forces that can further perpetuate the clustering of maternal morbidity and mortality in this population. Understanding the impacts of COVID-19 among Black women and birthing people requires theoretical frameworks that can sufficiently conceptualize their multi-level, interacting, and dynamic nature. Thus, we advocate for the proliferation of syndemic perspectives to guide maternal disparities research and prevention during the COVID-19 pandemic. These perspectives can enable a holistic and nuanced understanding of the intersection of endemic and COVID-19-specific vulnerabilities and disparities experienced by Black women and birthing people. Syndemic-informed research can then lead to impactful multi-level prevention strategies that simultaneously tackle both endemic and COVID-19-specific factors and outcomes that lead to the clustering of vulnerabilities and disparities over time.

Role of unsafe medical practices and sexual behaviours in the hepatitis B and C syndemic and HIV co-infection in Rwanda: a cross-sectional study.

OBJECTIVES: This study describes the burden of the hepatitis B, C and HIV co-infections and assesses associated risk factors. SETTING: This analysis used data from a viral hepatitis screening campaign conducted in six districts in Rwanda from April to May 2019. Ten health centres per district were selected according to population size and distance. PARTICIPANTS: The campaign collected information from 156 499 participants (51 496 males and 104 953 females) on sociodemographic, clinical and behavioural characteristics. People who were not Rwandan by nationality or under 15 years old were excluded. PRIMARY AND SECONDARY OUTCOMES: The outcomes of interest included chronic hepatitis C virus (HCV) infection, chronic hepatitis B virus (HBV) infection, HIV infection, co-infection HIV/HBV, co-infection HIV/HCV, co-infection HBV/HCV and co-infection HCV/HBV/HIV. Multivariable logistic regressions were used to assess factors associated with HBV, HCV and HIV, mono and co-infections. RESULTS: Of 156 499 individuals screened, 3465 (2.2%) were hepatitis B surface antigen positive and 83% (2872/3465) of them had detectable HBV desoxy-nucleic acid (HBV DNA). A total of 4382 (2.8%) individuals were positive for antibody-HCV (anti-HCV) and 3163 (72.2%) had detectable HCV ribo-nucleic acid (RNA). Overall, 36 (0.02%) had HBV/HCV co-infection, 153 (0.1%) HBV/HIV co-infection, 238 (0.15%) HCV/HIV co-infection and 3 (0.002%) had triple infection. Scarification or receiving an operation from traditional healer was associated with all infections. Healthcare risk factors-history of surgery or transfusion-were associated with higher likelihood of HIV infection with OR 1.42 (95% CI 1.21 to 1.66) and OR 1.48 (1.29 to 1.70), respectively, while history of physical traumatic assault was associated with a higher likelihood of HIV and HBV/HIV co-infections with OR 1.69 (95% CI 1.51 to 1.88) and OR 1.82 (1.08 to 3.05), respectively. CONCLUSIONS: Overall, mono-infections were common and there were differences in significant risk factors associated with various infections. These findings highlight the magnitude of co-infections and differences in underlying risk factors that are important for designing prevention and care programmes.

Whither syndemics?: Trends in syndemics research, a review 2015-2019.

As originally conceived, syndemics refers to complex epidemics involving two types of adverse interaction - the clustering and interactions of two or more diseases or health conditions (the biological-biological interface) and social environmental factors (the biological-social interface). The theory has been widely applied in the fields of medicine, public health and anthropology, but how the concept is conceptualised and investigated in new syndemics literature remains unclear. This paper offers a scoping review of recent syndemics literature aiming to address the question: Where have scholars taken the syndemics concept? Five bibliographic databases were searched for titles containing 'syndemic[s]' revealing 334 records. A total of 143 journal articles, 23 book chapters, 21 commentaries, 2 books and 5 dissertations were assessed. Citations were classified into five categories: syndemics (n = 22), potential syndemics (n = 34), socially determined heightened burden of disease (n = 29), harmful disease cluster (n = 32) and additive adverse conditions (n = 71). The limited number of citations meeting the definition of a syndemic arrangement highlights the challenges related to describing and empirically supporting the biological-biological and biological-social relationships. Nevertheless, there is value in retaining the original, holistic, biosocial meaning of syndemics to identify and detail the casual pathways and mechanisms of interactions.

Investigating possible syndemic relationships between structural and drug use factors, sexual HIV transmission and viral load among men of colour who have sex with men in Los Angeles County.

INTRODUCTION AND AIMS: Past research investigating syndemic factors and HIV-related outcomes has overlooked the impact of structural conditions on behaviours linked with HIV transmission and disease progression. Given prevalent substance use among our sample, we explored whether four structural conditions indicative of social marginalisation and previously correlated with increased risk for HIV infection demonstrated syndemic (additive/synergistic) effects on: (i) HIV viral suppression; and (ii) self-reported involvement in sexual HIV transmission behaviours among a prospective cohort mostly comprising men of colour who have sex with men (MCSM; i.e. Latino/Hispanic and African American/black men) in Los Angeles County. DESIGN AND METHODS: Data were collected between August 2014 and March 2017. The structural conditions of interest were: current unemployment, recent (≤6 months) incarceration history, 'unstable' accommodation (past month) and remote (>6 months) contact with health-care providers. Generalised estimating equations assessed possible additive effects of experiencing multiple structural conditions, and possible synergistic effects on the HIV-related outcomes. RESULTS: Of 428 participants, nearly half (49%) were HIV-positive at baseline. Involvement in sexual HIV transmission risk behaviours varied over follow-up (22-30%). Reporting ≥2 structural syndemic conditions was significantly associated with reporting sexual HIV transmission risk behaviours among HIV-negative participants, and detectable viral load among HIV-positive participants. Frequent methamphetamine use was consistently associated with the HIV-related outcomes across the final multivariate models. DISCUSSION AND CONCLUSIONS: When developing initiatives to address HIV transmission among marginalised sub-populations including MCSM, we must holistically consider systemic and structural issues (e.g. unemployment and homelessness), especially in the context of prevalent substance use.

Embracing Causal Complexity in Health Disparities: Metabolic Syndemics and Structural Prevention in Rural Minority Communities.

Chronic discrimination and associated socioeconomic inequalities have shaped the health and well-being of Black Americans. As a consequence of the intersection of these factors with rural deprivation, rural Black Americans live and work in particularly pathogenic environments that generate disproportionate and interacting chronic comorbidities (syndemics) compared to their White and/or urban counterparts. Traditional prevention research has been unable to fully capture the underlying complexity of rural minority health and has generated mostly low-leverage interventions that have failed to reverse adverse metabolic outcomes among rural Black Americans. In contrast, novel research approaches-such as system dynamics modeling-that seek to understand holistic system structure and determine complex health outcomes over time provide a robust framework to develop a more accurate understanding of the key factors contributing to type 2 diabetes. This framework can then be used to establish more efficacious interventions to address disparities among minorities in rural areas. This paper advocates for a unified complex systems epistemology and methodology in advancing rural minority health disparities research. Toward this goal, we (1) provide an overview of rural Black American metabolic health research, (2) introduce a complex systems framework in rural minority health disparities research, and (3) demonstrate how community-based system dynamics modeling and simulation can help us plow new ground in rural minority health disparities research and action. We anticipate that this paper can serve as a catalyst for a long-overdue discourse on the relevance of complex systems approaches in minority health research, with practical benefits for numerous disproportionately burdened communities.