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Cadernos de Saúde Pública

On-line version ISSN 1678-4464

Cad. Saúde Pública vol.32 no.10 Rio de Janeiro Oct. 2016  Epub Nov 03, 2016 


Mortality related to tuberculosis-HIV/AIDS co-infection in Brazil, 2000-2011: epidemiological patterns and time trends

Mortalidade relacionada à coinfecção tuberculose e HIV/AIDS no Brasil, 2000-2011: padrões epidemiológicos e tendências temporais

Mortalidad relacionada con la coinfección de tuberculosis y VIH/SIDA en Brasil, 2000-2011: patrones epidemiológicos y tendencias temporales

Mauricélia da Silveira Lima1 

Francisco Rogerlândio Martins-Melo1  2 

Jorg Heukelbach1  3 

Carlos Henrique Alencar1 

Reagan Nzundu Boigny1 

Alberto Novaes Ramos Júnior1 

1 Universidade Federal do Ceará, Fortaleza, Brasil.

2 Instituto Federal de Educação, Ciência e Tecnologia do Ceará, Caucaia, Brasil.

3 James Cook University, Townsville, Australia.


Co-infection of tuberculosis (TB)-HIV/AIDS is a persistent public health problem in Brazil. This study describes epidemiological patterns and time trends of mortality related to TB-HIV/AIDS co-infection. Based on mortality data from 2000-2011 (almost 12.5 million deaths), 19,815 deaths related to co-infection were analyzed. The average age-adjusted mortality rate was 0.97 deaths/100,000 inhabitants. The highest mortality rates were found among males, those in economically productive age groups, black race/color and residents of the South region. There was a significant reduction in the mortality coefficient at the national level (annual average percent change: -1.7%; 95%CI: -2.4; -1.0), with different patterns among regions: increases in the North, Northeast and Central regions, a reduction in the Southeast and a stabilization in the South. The strategic integration of TB-HIV/AIDS control programmes is fundamental to reduce the burden of mortality related to co-infection in Brazil.

Keywords: Tuberculosis; HIV; Acquired Immunodeficiency Syndrome; Time Series Studies


A coinfecção tuberculose (TB)-HIV/AIDS é um problema de saúde pública persistente no Brasil. Neste estudo, descrevem-se padrões epidemiológicos e tendências temporais da mortalidade relacionada à coinfecção TB-HIV/AIDS. Baseado em dados de mortalidade de 2000-2011 (quase 12,5 milhões de mortes), foram analisados 19.815 óbitos relacionados à coinfecção. O coeficiente médio de mortalidade padronizado por idade foi de 0,97 óbitos/100 mil habitantes. Os maiores coeficientes de mortalidade foram verificados no sexo masculino, grupos etários economicamente produtivos, raça/cor negra e residentes da Região Sul. Houve diminuição significativa dos coeficientes de mortalidade em nível nacional (variação percentual anual média: -1,7%; IC95%: -2,4; -1,0), com diferentes padrões entre regiões: aumento nas regiões Norte, Nordeste e Centro-oeste, redução na Sudeste e estabilização na Sul. A integração estratégica dos programas de controle de TB-HIV/AIDS é fundamental para reduzir a carga de mortalidade relacionada à coinfecção no Brasil.

Palavras-chave: Tuberculose; HIV; Síndrome de Imunodeficiência Adquirida; Estudos de Séries Temporais


La coinfección tuberculosis (TB)-VIH/SIDA es un problema de salud pública persistente en Brasil. En este estudio, se describen patrones epidemiológicos y tendencias temporales de la mortalidad relacionada con la coinfección TB-VIH/SIDA. Basado en datos de mortalidad de 2000-2011 (casi 12,5 millones de muertes), fueron analizadas 19.815 muertes, todas relacionadas con la coinfección. El coeficiente medio de mortalidad ajustado por edad fue de 0,97 muertes/100.000 habitantes. Los mayores coeficientes se verificaron en el sexo masculino, grupos de edad económicamente productivos, raza negra y residentes de la región Sur. Hubo una disminución significativa del coeficiente de mortalidad a nivel nacional (variación porcentual anual media: -1,7%; IC95%: -2,4; -1,0), con diferentes patrones entre regiones: aumento en las regiones Norte, Nordeste y Centro-oeste, reducción en el Sudeste y estabilización en el Sur. La integración estratégica de los programas de control de TB-VIH/SIDA es fundamental para reducir la carga de mortalidad, relacionada con la coinfección en Brasil.

Palabras-clave: Tuberculosis; VIH; Síndrome de Inmunodeficiencia Adquirida; Estudios de Series Temporales


HIV/AIDS is an important and persistent public health problem in Brazil and worldwide, with a high morbidity and mortality burden, mainly when related to opportunistic infections such as tuberculosis (TB) 1), (2. People living with HIV/AIDS are 21-34 times more likely to develop active TB as compared to the general population 3. Active TB in people living with HIV/AIDS is a significant risk factor to increased HIV/AIDS and TB-related case fatality rates. People living with HIV/AIDS with TB are twice more likely to progress to death, in comparison with people living with HIV/AIDS without TB 4), (5.

In 2012, approximately 8.7 million individuals developed TB worldwide, 1.1 million (13%) of them living with HIV/AIDS 4), (5. On the other hand, about 20% of the 2.8 million people diagnosed with TB and tested for HIV had a positive HIV status. In this group, 42% were living in Sub-Saharan Africa. More than 75% of new cases of TB in HIV-positive patients are concentrated in 10 countries 4), (5.

According to the Joint United Nations Programme on HIV/AIDS (UNAIDS), the global goal is to reduce by half the number of deaths due to TB among people living with HIV/AIDS worldwide (to less than 250,000) 4), (5. In fact, about 1.3 million individuals benefitted from the integration of TB and HIV/AIDS control programs, and did not progress to death between 2005 and 2012. In 17 of the 41 countries with a high number of co-infected patients with TB and HIV/AIDS, mortality declined by 50% or more. On the other hand, mortality decreased by less than 25% in Brazil during this period 4), (5), (6.

In Brazil, TB-HIV/AIDS co-infection presents a heterogeneous distribution among population groups 6. The occurrence of TB-HIV/AIDS co-infection ranged among Brazilian states, from 2.2% in Acre State in the North region to 19.3% in Rio Grande do Sul State in the South region 6), (7), (8.There has been a continuous decrease of nationwide mortality related to HIV/AIDS (by 6.6% in the period 2004-2013) 9, and TB (by 2.9% in the period 2001-2010) 6), (10. In 2013, 59.2% of new cases diagnosed with TB performed and received the results of HIV testing, with 9.8% TB-HIV/AIDS co-infections 6.

Despite the clinical, epidemiological and social relevance of TB-HIV/AIDS co-infection in Brazil, there are few systematic studies of national or regional scale on the epidemiological aspects and temporal evolution of mortality related to this co-infection in the country 6), (9. Knowledge of the impact of mortality related to TB-HIV/AIDS co-infection is important to assess endemic dynamics, and to improve surveillance and control activities 9), (10. In this nationwide study, we analyzed the epidemiological patterns and time trends of mortality related to TB-HIV/AIDS co-infection in Brazil, from 2000 to 2011.

Material and methods

Study area

Brazil has a total area of 8.5 million km2 and, in 2015, had an estimated population of 204,5 million inhabitants (in the study period, ranging from 170 million in 2000 to 192.4 million inhabitants in 2011). The country is divided into five administrative geographic regions (South, Southeast, Central, North and Northeast), 27 Federal Units (26 states and one Federal District), and 5,570 municipalities (Brazilian Institute of Geography and Statistics - IBGE; There are considerable economic, geographical and cultural diversities in each Brazilian region.

Study design and population

We performed a nationwide population-based study in Brazil using official secondary mortality data. We included all deaths related to TB-HIV/AIDS co-infection recorded in Brazil in the period from 2000 to 2011. Co-infection was defined as the concomitant presence of TB and HIV/AIDS on the same death certificate, either as underlying or as associated causes of death: multiple causes of death 11.

Tuberculosis as cause of death corresponds to the categories included in the group A15-A19 (Tuberculosis), while HIV/AIDS corresponds to the group B20-B24 (Human immunodeficiency virus [HIV] disease) of the 10th revision of the International Statistical Classification of Diseases and Related Health Problems (ICD-10) 12.

Data sources

Mortality data were obtained from the Mortality Information System (SIM) of the Brazilian Ministry of Health. SIM data are available at the website of the Informatics Department of the Brazilian Unified National Health System (DATASUS; All information in the SIM database is based on death certificates, consisting of a standardized form to be filled out by physicians, which contains demographic (sex, age, race/color, marital status, education, place of residence and year of occurrence of death), and clinical information (underlying and associated causes of death).

In the SIM database, data sets are separated by Federal Unit and year of death. Thus, a total of 324 data files (27 Federal Units, 12 years) with approximately 12.5 million entries were downloaded and merged into a single data file. In a second stage, field codes of different data sets were standardized, and we eliminated variables not considered in the analysis. All death certificates related to TB and HIV/AIDS as a cause of death in any field were identified. New variables for death causes were coded, as in many cases there was more than one documented cause of death per line.

Population data were obtained from the IBGE, based on data from the National Demographic Censuses (2000 and 2010), and population estimates for inter-census years (2001-2009 and 2011). These population data are available in the DATASUS (

Data analysis

For the descriptive analysis, we present the mean and standard deviation (SD) for continuous variables, and absolute numbers and proportions with their respective 95% confidence intervals (95%CI) for categorical variables.

We calculated crude mortality rates (per 100,000 inhabitants) by sex, age group, race/color and place of residence (states and regions) by dividing the number of deaths by the population in each calendar year, and expressed per 100,000 inhabitants. We calculated age-adjusted mortality rates by the direct method, using as standard the Brazilian population from the 2010 census. The age groups used for standardization and calculation of age-specific mortality rates were: 0-4, 5-9, 10-19, 20-29, 30-39, 40-49, 50-59, 60-69 and ≥ 70 years. Then, based on the values of crude mortality rates, we calculated the rate ratios (RR) and the respective 95%CI to determine the differences between the study groups (sex, age group, race/color and regions).

Trend analyses of mortality rates were performed using joinpoint regression models 13. This analysis uses an algorithm which tests whether a multi-segmental line is significantly better than a straight line or a line with fewer segments. The analysis started with a minimum number of joinpoints (for example, 0 joinpoints, resulting in a straight line) and tested if one or more joinpoints (in our analysis up to 3 joinpoints) increased the significance when added to the model. Each joinpoint indicates a statistically significant change in the slope. Statistical significance was tested using the Monte Carlo permutation test, which chooses the best segment for each model. The annual percent change (APC) and 95%CI was calculated for each segment. To simplify trend comparison for the indicators with more than one slope, we also calculated the average annual percent change (AAPC) over the entire period. The AAPC was estimated as the geometric-weighted mean of the APC, with weights equal to the length of each time interval segment. Trends were considered statistically significant when APC and AAPC presented a p-value < 0.05 13.

Data analysis was performed using the Stata software package, version 11.2 (StataCorp LP, College Station, USA). Joinpoint regression analysis was performed using the Regression Joinpoint Program version 4.0.4 (US National Cancer Institute, Bethesda, USA). We created thematic maps of spatial distribution of mortality rates by state of residence using ArcGIS software version 9.3 (Environmental Systems Research Institute, Redlands, USA).

Ethical aspects

SIM and IBGE databases are available in a public domain and do not allow identification of individuals. This study was approved by the Ethical Review Board of the Federal University of Ceará, Fortaleza, Ceará State, Brazil, under protocol number 699,138/2014.


In the period from 2000 to 2011, a total of 12,491,280 deaths were recorded in Brazil, with 92,144 (0.74%) TB-related deaths and 144,175 (1.2%) HIV/AIDS-related deaths. We identified a total of 19,815 deaths in which TB and HIV/AIDS were mentioned on the same death certificates (21.5% of deaths by TB and 13.7% of deaths by HIV/AIDS). HIV/AIDS was mentioned as underlying cause in 98.6% (19,541/19,815) of these deaths, and TB in 0.03% (6/19,815). The average annual crude and age-adjusted mortality rate was 0.89 deaths/100,000 inhabitants and 0.97 deaths/100,000 inhabitants, respectively.

Epidemiological characteristics

The predominating socio-demographic characteristics were: male sex (70.2%), white race/color (48.2%), single marital status (72.4%), age 30-39 years (38.1%, mean: 38.9; SD ± 10.5; median: 38.1), and residence in the Southeast region (53.5%) (Table 1). São Paulo State (Southeast region) presented about one third of all deaths related to co-infection (30.5%) (Table 1). Although about half did not reside in state capitals (54.9%), the place of occurrence of deaths was almost exclusively in urban hospitals (93.4%) and in the Brazilian state capitals (59.3%) (Table 1).

Table 1: Epidemiological characteristics of deaths related to TB-HIV/AIDS co-infection in Brazil, 2000-2011 (n = 19,815). 

The age-adjusted mortality rates were higher among males than females (1.37 vs. 0.55 deaths/100,000 inhabitants, respectively), with a RR of 2.43 (95%CI: 2.18; 2.70) (Table 2). The mortality rates was higher in the age groups 30-39 and 40-49 years. The black population had a 2.6-fold greater risk as compared to the white population, while brown race/color showed lower mortality rates compared to white race/color (Table 2). The South and Southeast regions showed the highest mortality rates (1.55 and 1.12 deaths/100,000 inhabitants, respectively), with significant differences when compared to the North region (Table 2). The highest average annual mortality rates by state of residence were observed in Rio Grande do Sul (South region) (2.55 deaths/100,000 inhabitants), followed by the states of Rio de Janeiro (1.77 deaths/100,000 inhabitants) and São Paulo (1.24 deaths/100,000 inhabitants), both in the Southeast region (Figure 1).

Table 2: Average annual mortality rates related to TB-HIV/AIDS co-infection (per 100,000 inhabitants) stratified by sex, age group, race/color and region of residence. Brazil, 2000-2011. 

Figure 1: Spatial distribution of average annual mortality rates related to TB-HIV/AIDS co-infection (per 100,000 inhabitants) by states of residence. Brazil, 2000-2011. 

Temporal trends

We observed a significant decreasing trend of age-adjusted mortality rates at national level (AAPC: -1.7%; 95%CI: -2.4; -1.0), with considerable regional variations (Figure 2; Table 3). Mortality increased significantly in the North (AAPC: 5.7%; 95%CI: 2.2; 9.4), Northeast (AAPC: 5.4%; 95%CI: 3.3; 7.6), and Central (AAPC: 3.5%; 95%CI: 0.2; 6.9) regions. In contrast, we observed a decreasing trend in the Southeast region over the entire period (AAPC: -4.1%; 95%CI: -2.4; -1.0), with a decrease in the period 2000-2005 and a stabilization in the period 2005-2011. The South region presented a stable trend in the period (AAPC: -0.5%; 95%CI: -2.9; -1.9), with an increase from 2000 to 2004, and a decrease trend in the period 2004-2011 (Table 3).

The sex-specific mortality rate presented a significant decreasing trend for males and a stable trend for females (Table 3). For age-specific rmortality ates, we observed a significant decrease in the 20-29 year-old and 30-39 year-old age groups. The older age groups showed significant increasing trends of mortality rates: 50-59 year-olds, 60-69 year-olds and ≥ 70 year-olds. The mortality in pediatric and younger age groups, and in 40-49 year-olds remained stable during the study period (Table 3).

Figure 2: Trends of age-adjusted mortality rates related to TB-HIV/AIDS co-infection (per 100,000 inhabitants) in Brazil and regions, 2000-2011. 

Table 3: Joinpoint regression analysis of mortality rates related to TB-HIV/AIDS co-infection by region, sex and age group. Brazil, 2000-2011. 


In this nationwide population-based study, presented a comprehensive overview of magnitude and time trends of mortality related to TB-HIV/AIDS co-infection in Brazil over a 12-year period. Our data show a decreasing trend of mortality in Brazil, but with different patterns among regions, with increasing trends in the poorest regions of the country, such as the North and Northeast regions. There was a higher mortality burden among males, individuals of a working age, those of black race/color and residents in high HIV/AIDS-endemic states/regions 3), (4), (5), (14.

The South and Southeast regions (including the states of Rio Grande do Sul, São Paulo and Rio de Janeiro) had the highest mortality rates related to TB-HIV/AIDS co-infection 15, but with a continuous decreasing trend in recent years. These results probably reflect the introduction and spread of the AIDS epidemic in the country. The state of São Paulo presented the first cases of the epidemic, followed by the state of Rio de Janeiro. These states significantly contributed to a rapid growth in the number of AIDS cases in the country 16.

We emphasize that the North and Northeast regions, the poorest regions of the country, showed increasing mortality rates in the study period 17. Our results reinforce the ongoing change of transmission dynamics of HIV/AIDS infection, from socio-economically well-off population groups in urban centers, to more socio-economically deprived vulnerable populations in rural areas, with a consequent increased risk for concomitant TB infection. Our data confirm previous studies indicating tremendous social inequalities being a major risk for co-infection 17), (18.

The distribution of mortality rates according to demographic characteristics portrays a continuous decreasing trend for males and working age populations (20-49 years) 18. This trend has been observed in infections caused by TB and HIV/AIDS and similarly overall infection rates can be linked to transmission dynamics, considering socio-economic, environmental and behavioral factors 19. Our data also show a significant increase of mortality related to co-infection in the elderly. Two different patterns were identified: those infected < 60 years-old with better survival rates due to improved antiretroviral therapy (ART), including highly active antiretroviral therapy (HAART), and those infected > 60 years-old. The high vulnerability in these population groups increases the risk of developing both diseases as a result of higher previous exposure rates to Mycobacterium tuberculosis. Other factors in the elderly include the increased likelihood of atypical presentations of TB, comorbidity, resistance to condom use and delayed detection of HIV infection 20), (21.

We have observed a decrease in deaths among children < 10 years. In fact, TB incidence has been reduced in this age group in recent decades 6), (10. BCG vaccination coverage is also very high in Brazil (reaching 100% in recent years) resulting in enhanced protection against invasive forms of childhood TB 20. In addition, mother-to-child transmission of HIV has been reduced effectively in Brazil as a result of integrated control programs 16), (22. There has been an increased access to prenatal care services and assisted birth in HIV-positive mothers, including antiretroviral medication in HIV infected pregnant women and exposed newborns 22. There was estimated to occur a 78% reduction in mother-to-child transmission of HIV between 2001 and 2013 in Latin America and the Caribbean. Of the total of women who gave birth in 2013 (11 million), 87% had at least four prenatal consultations number (the recommended minimum), 74% had access to HIV testing and counseling, and 93% of HIV-positive pregnant women received HAART (34% increase compared to 2010) 22), (23), (24.

Some strategies have favored an improvement in mortality indicators related to TB-HIV/AIDS co-infection. These strategies include: free dispensing of antiretroviral drugs for treatment of AIDS since 1996, continuous updating of clinical protocols and therapeutic guidelines for the management of HIV infection in adults (2014), children and adolescents (2014), and prophylaxis of vertical transmission of HIV and antiretroviral therapy in pregnant women (2010) 9), (16), (22), (25. In 2014, HIV infection was included in the Brazilian list of notifiable diseases, further aiming at improving disease control 9.

Our data show regional differences, which may reflect operational factors in the implementation of these measures. Mortality rates were higher in regions considered as more economically developed, with increasing trends in other regions, consistent with the AIDS expansion process in Brazil. The presence of variables considered indicators for poverty in Brazil and a higher risk among those with a low education and the black population, confirms the increased mortality in these regions 6), (9), (10), (15), (16), (26), (27.

Similar to other infectious diseases, poverty may have increased the vulnerability for TB and HIV/AIDS cases. There is a clear link between TB, poverty and social exclusion, hampering control efforts in many Brazilian regions 10), (27), (28. Those who are mostly affected live in poor, urban neighborhoods, with a trend to more and more rural areas 9. HIV/AIDS is being spread within the poorest populations in the country, with negative impacts on clinical and epidemiological aspects 22), (27. In cases with TB-HIV/AIDS co-infection, poverty has previously been shown to be related to higher mortality rates 10), (26), (29.

Reduced access to information, insufficient knowledge, and reduced access to health care may result in a delay of diagnosis, late treatment and low adherence to treatment 18), (23. The current challenge is to integrate TB and AIDS control programs effectively 10), (30. The contrast of the reduction of mortality in the South region and the increase of mortality rates in the North, Northeast and Central regions reflects socio-economic differences between these regions. Regional disparities and social determinants directly reflected in different patterns of the quality of health care and information systems 10), (28.

Our study is subject to limitations. The use of secondary data may have limited the analysis, as many variables of interest are not available with under registering of deaths. On the other hand, we assume that the databases are of acceptable quality, considering the improvement of coverage and quality of SIM records during recent years 9), (16), (31. However, there still may exist regional differences in the performance and quality of data, and the number of deaths related to TB-HIV/AIDS co-infections may have been underestimated 31, especially in the North and Northeast regions. There were a considerable number of data sets with missing information, especially for race/color, education and marriage status, thus the respective analyses and interpretation should be performed with caution 32), (33), (34. Despite these limitations, the results of this study are highly representative, as all death certificates recorded in Brazil have been included, during a period of 12 years (2000-2011) 34), (35.

In conclusion, our study shows a consistent decline of the mortality related to TB-HIV/AIDS co-infection in Brazil, despite the high levels still observed. Population groups at high risk have been identified, with consistent regional differences. The increasing mortality trend in the socio-economically most disadvantaged North, Northeast and Central regions is worrying. We recognize the need for implementation and monitoring the control actions for TB/HIV co-infection to reduce the morbidity and mortality burden in all Brazilian regions.


We thank the Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (Capes/Brazil) for granting a Masters Scholarship to M.S.L. J.H. is research fellow at the Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq/Brazil).


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Recibido: 22 de Febrero de 2015; Revisado: 10 de Septiembre de 2015; Aprobado: 20 de Octubre de 2015

Correspondence Universidade Federal do Ceará. Rua Professor Costa Mendes 1608, Fortaleza, CE 60430-140, Brasil.

Contributors M. S. Lima contributed to the conception and scope, write-up of the article and approval of final revision. F. R. Martins-Melo, J. Heukelbach and C. H. Alencar contributed to the critical revision of content, article write-up and approval of final revision. R. N. Boigny contributed to the data collection, critical revision of content, and approval of final revision. A. N. Ramos Júnior contributed to the conception and scope, critical revision of content, write-up of the article and approval of final revision.

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