Social determinants of health and catastrophic costs associated with the diagnosis and treatment of tuberculosis

ABSTRACT

The epidemiological relevance of tuberculosis is directly related to the socioeconomic profile of a given country. Vulnerability to tuberculosis is influenced by biological factors (e.g., malnutrition, HIV infection, and age) and social factors (e.g., unhealthy housing, high population density, inappropriate working conditions, and lack of access to health services). In many cases, multiple vulnerabilities occur in conjunction. We propose here a reflection on tuberculosis from the point of view of the social determinants of health, as well as the costs associated with its diagnosis and treatment in Brazil, based not only on data in the international literature but also on evidence related to the national context. Given the magnitude of tuberculosis as a socially mediated disease, there is an evident need for greater involvement of health professionals and of the scientific community to implement relevant operational and research measures to understand the social conditions influencing the health-illness continuum for tuberculosis patients. Although the recent economic crisis in Brazil has contributed to increased mortality from all causes, including tuberculosis, health and social protection expenditures have mitigated detrimental health effects. The evidence presented here underscores the importance of public social protection policies for minimizing the effects of tuberculosis indicators, with the aim of eliminating tuberculosis in Brazil.

Keywords:
Tuberculosis; Social determinants of health; Cost of illness; Costs and cost analysis

RESUMO

A relevância epidemiológica da tuberculose está diretamente relacionada ao perfil socioeconômico dos países. A vulnerabilidade à tuberculose é influenciada por fatores biológicos, como desnutrição, infecção por HIV ou faixa etária, e fatores sociais, como habitações insalubres, alta densidade demográfica, condições de trabalho inadequadas e inacessibilidade aos serviços de saúde; porém, muitas vezes essas vulnerabilidades se somam. Propomos aqui uma reflexão sobre a tuberculose sob o ponto de vista dos determinantes sociais de saúde e dos custos associados ao seu diagnóstico e tratamento, baseando-nos não somente em dados publicados na literatura internacional, mas também nas evidências já presentes no panorama nacional. Considerando a magnitude da tuberculose como doença socialmente produzida, fica evidente a necessidade de maior envolvimento de profissionais de saúde e da comunidade científica no sentido de implementar medidas operacionais e de investigação relevantes para a compreensão dos condicionantes sociais do processo saúde-doença na tuberculose. A recente crise econômica pela qual passa o Brasil contribuiu para o aumento da mortalidade por todas as causas, incluindo por tuberculose; porém, investimentos em saúde e proteção social reduziram os danos à saúde. Essas evidências reforçam a importância de políticas públicas de proteção social para a redução dos indicadores da tuberculose visando sua eliminação no Brasil.

Descritores:
Tuberculose; Determinantes sociais de saúde; Efeitos psicossociais da doença; Custos e análise de custos

INTRODUCTION

In recent decades, there have been advances in tuberculosis control worldwide. The incidence of tuberculosis decreased by 2% between 2017 and 2018, and 53 million deaths were averted between 2000 and 2016. Despite these results, tuberculosis remains a global health priority. In 2018, there were an estimated 10 million new cases of tuberculosis, approximately 1.5 million individuals having died from the disease.¹ In that same year, tuberculosis was one of the ten leading causes of death worldwide, ranking above HIV/AIDS as the leading cause of death from a single infectious agent. Tuberculosis morbidity and mortality are directly related to the socioeconomic profile of a given country, being higher in poorer countries, where 95% of tuberculosis-related deaths occur.¹

Brazil remains on the list of countries with the highest burden of tuberculosis. In 2019, 73,864 cases of the disease were reported in the country, and 4,490 individuals (including men, women, and children) died from the disease in the country.² According to the World Health Organization (WHO), Brazil ranks 20th for disease burden and 19th for tuberculosis/HIV coinfection.^1-3

The distribution of tuberculosis in Brazil is directly related to differences in socioeconomic conditions across municipalities. In municipalities in which socioeconomic conditions are better (in accordance with new Brazilian National Tuberculosis Control Program criteria), the tuberculosis incidence rate increased by 1.8%, from 31.8/100,000 population in 2015 to 32.3/100,000 population in 2018 (p = 0.004). In municipalities in which socioeconomic conditions are poor, the tuberculosis incidence rate increased by 2.7%, from 52.2/100,000 population in 2015 to 53.7/100,000 population in 2018 (p < 0.001).²

The End TB Strategy, approved by the World Health Assembly in 2014 and by Brazil in 2017, with the implementation of the Brazilian National Plan to End Tuberculosis as a Public Health Problem,⁴ includes the following targets for achievement by 2035: a 90% reduction in the tuberculosis incidence rate; a 95% reduction in the number of tuberculosis-related deaths; and elimination of catastrophic costs caused by tuberculosis.

The strategy is based on three pillars; the second pillar focuses on “bold policies and supportive systems”, emphasizing the importance of social support for successful tuberculosis control.^4,5

Vulnerability to tuberculosis is influenced by biological factors affecting the immune response to Mycobacterium tuberculosis, as occurs in young children and patients with comorbidities such as HIV infection and diabetes mellitus. Vulnerability to tuberculosis is also influenced by social factors, exposing individuals to a greater risk of contact with M. tuberculosis and subsequent illness due to conditions of precarious housing conditions, malnutrition, inappropriate working conditions, and lack of access to health services. In addition, patients with tuberculosis disease are faced with loss of work productivity and the high costs associated with the diagnosis and treatment of tuberculosis. In many cases, multiple vulnerabilities occur in conjunction, especially in shantytowns in poor countries and poor areas of large cities, where individual immune status is influenced by social determinants of health (SDOH) that increase the risk of active tuberculosis and latent tuberculosis infection.⁶

We propose here a reflection on tuberculosis from the point of view of SDOH and the costs associated with the diagnosis and treatment of tuberculosis in Brazil, based not only on data in the international literature but also on national evidence regarding the association between living conditions (i.e., access to education, health care, appropriate housing, and decent work) and the incidence of tuberculosis, as well as the impact that social support measures have on disease control.

METHODS

To provide a theoretical basis for the topics covered here, we conducted a narrative review of studies published between January of 2000 and November of 2019. The included studies were identified by database searching. The search strategy included title searches with the terms “social determinants of health” and “catastrophic costs” combined with the term “tuberculosis”. We searched for studies published in any of the following languages: Portuguese, English, Spanish, French, and Italian. We searched the following databases: SciELO, MEDLINE (PubMed), and Google Scholar. We also searched the Brazilian National Ministry of Health website and the WHO website. A total of 230 studies were retrieved. Of those, 68% were published in the 2015-2019 period and 96% were in English. To identify additional studies, we carried out a hand search of the references cited in the studies retrieved by database searching. A total of 6 studies were thus identified as eligible for full review.

SOCIAL DETERMINANTS OF HEALTH AND THEIR ASSOCIATION WITH TUBERCULOSIS IN BRAZIL AND THE WORLD

According to the WHO, SDOH are the social, political, economic, environmental, and cultural conditions in which people are born, grow up, live, work, and age, including the local health care system, all of which influence their health status.^7,8 According to the Brazilian National Commission on the Social Determinants of Health,⁹ SDOH are social, economic, cultural, ethnic/racial, psychological, and behavioral factors increasing the risk of disease, causing health problems to the population. SDOH have also been defined as inequities in the conditions in which people are born, live, and age, driven by inequities in power, money, and resources. By yet another definition, SDOH are factors and mechanisms by which societal conditions affect health and that can be altered by informed action.^10-12

Societal conditions affect health by the following factors and mechanisms^9,13:

• physical/material factors-income inequality and a lack of investment in social infrastructure influence the production of health and disease;

• psychosocial factors-individual perceptions and experiences in unequal societies are harmful to health;

• ecosocial perspectives-frameworks that seek to integrate social and biological reasoning and a dynamic, historical, and ecological perspective;

• social capital-wear and tear on relationships of support and security among people and among groups of people, through which economic (income-related) issues negatively influence health status.

Brazil has a population of 208.5 million inhabitants, of whom 13.5 million (6.5%) live in extreme poverty (i.e., on a monthly per capita income of less than 145 Brazilian reals [R$]) and 52.5 million (18.7%) live in poverty (i.e., on a monthly per capita income of less than R$ 420) as defined by the World Bank.¹⁴ Recent data from the Brazilian Institute of Geography and Statistics show that 29.5 million people currently living in poverty have no access to sewerage; 13.5 million have no access to piped water; and 11.1 million have no access to garbage collection services. Poverty or low income plays a central role in school dropout rates and delayed academic achievement among individuals in the 15- to 17-year age bracket, with 11.8% dropping out of school during high school and 33.6% having delayed educational attainment. Extreme poverty affects a highly vulnerable group of individuals that are not generally well-equipped to enter the labor market.¹⁵

Tuberculosis and poverty are correlated; poverty is associated with poor health, and poor health can lead to poverty, reducing job opportunities and resulting in a vicious cycle that tends to worsen.⁶ Tuberculosis predominantly affects poorly educated adult males in their economically productive years. Tuberculosis is directly associated with living in “subnormal agglomerations” (i.e., slums), lack of access to primary health care, malnutrition, and poor diet quality, as well as with abuse of alcohol, tobacco, and other drugs.^16,17 Poor living conditions and lack of access to information (resulting from a low level of education) increase the risk of tuberculosis. A low level of education can limit patient understanding of the importance of appropriate treatment and the risks of noncompliance with tuberculosis treatment, creating further obstacles to the elimination of the disease and contributing to the emergence of drug-resistant strains (multidrug-resistant tuberculosis and extensively drug-resistant tuberculosis).^18-20

Comorbidities such as diabetes mellitus, HIV infection, mental health disorders, silicosis, and chronic immunosuppressive conditions, as well as malnutrition, together with abuse of alcohol, tobacco, and other drugs, are predictive factors for noncompliance with tuberculosis treatment and increased health care costs.^7,21-23

In a systematic review of the association between tuberculosis and socioeconomic indicators in Brazil, major risk factors for the development of tuberculosis included having no regular income, having a history of incarceration, being undernourished, being separated or widowed, and having few assets. In addition, alcoholism, unemployment, and a low level of education were associated with poor tuberculosis outcomes (death, treatment abandonment, and treatment failure).^24,25

According to the WHO and the United Nations Human Settlements Programme, of 6.908 billion people in the world, approximately 1 billion (14.5%) lived in slums in 2010 and, by 2050, the number of slum dwellers will have doubled.¹⁷ Slum dwellers live in extremely precarious conditions, including overcrowding, poor sanitation, poor housing conditions, poor transportation infrastructure, and increased violence.²⁶ In an ecological study conducted in 5,565 Brazilian municipalities, household crowding and the unemployment rate were the socioeconomic variables most commonly associated with the incidence of tuberculosis.²⁷ In contrast, the Accelerated Growth Program implemented in the Rocinha favela in the city of Rio de Janeiro, Brazil,²⁸ resulted in a reduction in the incidence of tuberculosis, achieved by urban interventions such as street widening and improved air circulation, showing that better living conditions can improve tuberculosis control.

CATASTROPHIC COSTS ASSOCIATED WITH THE DIAGNOSIS AND TREATMENT OF TUBERCULOSIS

Tuberculosis disease and treatment costs fall on the household budget, further aggravating poverty and resulting in lost work time, which in turn results in economic losses not only for families but also for the country, reducing the national workforce.^29-33

Costs associated with tuberculosis diagnosis and treatment include direct costs, indirect costs, and coping costs. Direct medical costs are medical expenses such as medications, hospital/physician fees, laboratory tests, and imaging tests. Direct nonmedical costs are expenses such as transportation, food, and lodging, which can be assessed separately before and after the diagnosis of tuberculosis. Indirect costs are income reductions partially or fully attributable to disease-related work disability. Indirect costs include lost work productivity for patients and family caregivers.^34-37 Finally, coping costs are those incurred by patients and family caregivers when they cannot pay for care using their own income and therefore borrow money, use savings, sell assets, or cut down on spending for food/education.^37,38

Difficulty gaining access to health care and the high costs involved can delay the diagnosis of tuberculosis and be economically catastrophic for households. Catastrophic costs are defined as the sum of direct, indirect, and coping costs to the patient ≥ 20% of total annual household income.^36-39

The TB-specific indicator designated “catastrophic total costs due to TB” is different from the “catastrophic health care expenditures” indicator, which is used as an indicator of overall progress toward universal health coverage because catastrophic TB costs incorporate not only medical care expenditures for treatment but also indirect costs. The TB-specific indicator is restricted to patients diagnosed with and treated for tuberculosis, whereas catastrophic health care expenditures include health care costs for all household members and for all health conditions.³⁷

IMPACT OF SOCIAL PROTECTION PROGRAMS ON TUBERCULOSIS OUTCOMES

Social protection sits at the intersection between health and social interventions and is an essential component of efforts to achieve ambitious health targets, including the end of tuberculosis. Social support provides tuberculosis patients with financial resources that can reduce financial hardship from direct and indirect health care costs, as well as reducing poverty and social vulnerability.^40-43

Cash transfer programs are forms of social protection based on the provision of cash to vulnerable households with the objective of reducing risk, vulnerability, and chronic poverty, as well as improving human capital.^44,45

Studies conducted in Brazil have shown that social protection has a positive impact on tuberculosis treatment outcomes. The Programa Bolsa Família (PBF) is a conditional cash transfer program for poor families (i.e., families living on a monthly per capita income of R$ 89-178) and extremely poor families (i.e., families living on a monthly per capita income of ≤ R$ 89).^46,47 The first study conducted in Brazil and examining the association between the PBF and tuberculosis treatment by correlating data from the Brazilian Tuberculosis Case Registry Database, the Cadastro Único database (which is used in order to identify and characterize low-income families), and the PBF payroll showed that the cure rate was 5% higher among tuberculosis patients who were PBF beneficiaries than among those who were not.⁴⁸

Brazil’s Family Health Strategy (FHS) facilitates access to health care and has led to higher rates of tuberculosis treatment success regardless of patient participation in a cash transfer program. A study conducted in the city of Rio de Janeiro examined the impact of the FHS and PBF on tuberculosis treatment outcomes.⁴⁹ Treatment was successful in 80% of the tuberculosis patients exposed to the FHS, being successful in 74% of those exposed to the PBF and in 64% of those exposed to neither program. Treatment success rate was highest (82%) in those exposed to both programs.

A meta-analysis of nine randomized clinical trials (a total of 1,687 participants) showed a modest association between social protection strategies and tuberculosis treatment success (RR = 1.09; 95% CI: 1.03-1.14).⁴⁰ Social protection strategies had the greatest impact on the rate of treatment abandonment, showing that they improve access to health care and, consequently, adherence to tuberculosis treatment.^40,50

In addition to having deleterious effects on the health of tuberculosis patients, SDOH and economic determinants of health have an impact on overall mortality in Brazil. A recent study showed that the economic recession in Brazil between 2014 and 2016 contributed to increases in mortality in the country, particularly among men, Black/Brown individuals, and individuals in the 30- to 59-year age bracket. However, health and social protection expenditures mitigated detrimental health effects, especially among vulnerable populations.⁵¹

FINAL CONSIDERATIONS

Given the magnitude of tuberculosis as a socially mediated disease, there is an evident need for greater involvement of health professionals, managers, and the scientific community to implement relevant operational and research measures to understand the social conditions influencing the health-illness continuum for tuberculosis patients. The evidence presented here underscores the importance of public social protection policies for minimizing the effects of tuberculosis indicators, with the aim of eliminating them in Brazil.

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• Financial support:

  None.
• 2
  Study carried out under the auspices of the Programa Acadêmico de Tuberculose, Faculdade de Medicina, Universidade Federal do Rio de Janeiro, Rio de Janeiro (RJ) Brasil.

Publication Dates

• Publication in this collection
  18 Nov 2020
• Date of issue
  2020

History

• Received
  12 Jan 2020
• Accepted
  23 Feb 2020