A Bundle of Services Increased Ascertainment of Tuberculosis among HIV-Infected Individuals Enrolled in a HIV Cohort in Rural Sub-Saharan Africa (original) (raw)
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Tuberculosis among HIV-infected population: incidence and risk factors in rural Tanzania
African Health Sciences, 2017
Background: The incidence of tuberculosis among HIV-infected populations with high CD4 count in high burden countries has not been well studied. Objective: To assess the TB incidence in HIV-infected adults and its associated risk factors. Method: A cohort study with retrospective review of medical records and prospective follow-up of HIV-infected adult participants attending CTC who were 18-55 years old, had CD4 count more than 250 cells/mm 3 in the period of 2008-2010 and were not on ART at enrolment. Cox proportional hazard regression was used to explore the predictors of incident TB. Results: Overall 777 (24%) of 3,279 CTC enrolled HIV-infected adults fulfilled the inclusion criteria of the study. The incidence of TB in the study population ranged from 0.8/100 per person years (PY) at risk (95% CI 0.5-1.3) in the main analysis to 1.7/100 PY at risk (95% CI 1.0-2.6) in sensitivity analyses. Only prior history of TB disease was found to have a significant association with an increased risk of TB, hazard ratio 5.7 (95% CI 2.0-16.4, p value 0.001). Conclusion: Tuberculosis incidence among HIV-infected adults with medium/high CD4 count in Bagamoyo is lower than in other high TB burden countries. Previously TB treated patients have a much higher risk of getting TB again than those who never had TB before.
Tropical Medicine and Health
Background Despite improvements in access to antiretroviral therapy (ART), mortality in people living with human immunodeficiency virus (PLHIV) is still high and primarily attributed to tuberculosis (TB) infection. In Sub-Saharan Africa, approximately 80% of HIV-related mortality cases are associated with TB. Relatively little is known about the incidence of TB among PLHIV in Tanzania and the determinant factors. We report the prevalence and incidence rate of confirmed TB and determine association with selected demographic and program-related factors based on data in the national HIV care and treatment program from 2011 to 2014. Methods We used the Tanzania National AIDS Control Programme database to obtain information on all HIV clients enrolled in the HIV care and treatment program between January 2011 and December 2014. We analyzed retrospective cohort data to assess the prevalence and TB incidence rate per 1000 person-years. A multivariable Cox proportional hazards regression mo...
2020
Background Despite improvements in access to antiretroviral therapy (ART), mortality in people living with human immunodeficiency virus (PLHIV) is still high and largely attributed to Tuberculosis (TB) infection. In sub-Saharan Africa, approximately 80% of HIV related mortality cases are associated with TB. Relatively little is known about incidence of TB among PLHIV in Tanzania and the determinant factors. We report incidence rate of confirmed TB and determine association with selected demographic and program related factors based on data in the national HIV care and treatment program from 2011 to 2014. Methods The Tanzania National AIDS Control Programme, Care and Treatment database was used to obtain information of all HIV clients enrolled in the HIV Care and Treatment Program between January 2011and December 2014. We analyzed retrospective cohort data to assess TB incidence rate per 1000 person-years. A multivariable Cox proportional hazards regression model was used to estimate hazard ratios and 95% confidence intervals for putative associated factors. Results Over the period of four years, there were 22,071 confirmed cases of pulmonary TB in 1,323,600 person years. The overall TB incidence was around 16.7 (95% CI 16.4-16.9) cases per 1000 person years. The annual incidence rate decreased by 12.4% from 17.0 (95% CI 16.5-17.4) in 2011 to 14.9 (95% CI 14.5-15.4) in 2014. TB incidence rate was significantly higher in persons not using ART and in males than females. The incidence of TB was higher in patients with advanced HIV disease and decreased with increasing age. The overall prevalence of TB was 2.2% with peak prevalence of 2.5% in 2013 and being higher among children < 15 years (3.2%) in the same year. Conclusion The study found an overall decrease of incidence of TB in PLHIV. Our results underline the current recommendations of HIV test and treat and provision of TB preventive therapy for those PLHIV without active TB after intensified TB case-finding.
Incidence Rates for Tuberculosis Among HIV Infected Patients in Northern Tanzania
Frontiers in Public Health
Background: HIV and tuberculosis (TB) are leading infectious diseases, with a high risk of co-infection. The risk of TB in people living with HIV (PLHIV) is high soon after sero-conversion and increases as the CD4 counts are depleted. Methodology: We used routinely collected data from Care and Treatment Clinics (CTCs) in three regions in northern Tanzania. All PLHIV attending CTCs between January 2012 to December 2017 were included in the analysis. TB incidence was defined as cases started on anti-TB medications divided by the person-years of follow-up. Poisson regression with frailty models were used to determine incidence rate ratios (IRR) and 95% confidence intervals (95% CI) for predictors of TB incidences among HIV positive patients. Results: Among 78,748 PLHIV, 405 patients developed TB over 195,296 person-years of follow-up, giving an overall TB incidence rate of 2.08 per 1,000 person-years. There was an increased risk of TB incidence, 3.35 per 1,000 person-years, in hospitals compared to lower level health facilities. Compared to CD4 counts of <350 cells/µl, a high CD4 count was associated with lower TB incidence, 81% lower for a CD4 count of 350-500 cells/µl (IRR 0.19, 95% CI 0.04-0.08) and 85% lower for those with a CD4 count above 500 cells/µl (IRR 0.15, 95% CI 0.04-0.64). Independently, those taking ART had 66% lower TB incidences (IRR 0.34, 95% CI 0.15-0.79) compared to those not taking ART. Poor nutritional status and CTC enrollment between 2008 and 2012 were associated with higher TB incidences IRR 9.27 (95% CI 2.15-39.95) and IRR 2.97 (95% CI 1.05-8.43), respectively. Discussion: There has been a decline in TB incidence since 2012, with exception of the year 2017 whereby there was higher TB incidence probably due to better diagnosis of TB following a national initiative. Among HIV positive patients attending CTCs, poor nutritional status, low CD4 counts and not taking ART treatment were associated with higher TB incidence, highlighting the need to get PLHIV on treatment early, and the need for close monitoring of CD4 counts. Data from routinely collected and available health services can be used to provide evidence of the epidemiological risk of TB.
AIDS (London, England), 2015
The objective of this study is to determine the incidence rate and risk factors of tuberculosis (TB) among HIV-infected adults accessing antiretroviral therapy (ART) in Tanzania. A prospective observational study among HIV-infected adults attending HIV clinics in Dar es Salaam. We estimated TB incidence rates among HIV-infected patients prior to and after ART initiation. We used Cox proportional hazard regressions to determine the predictors of incident TB among HIV-infected adults enrolled in the HIV care and treatment programme. We assessed 67 686 patients for a median follow-up period of 24 (interquartile range: 8-49) months; 7602 patients were diagnosed with active TB. The TB incidence rate was 7.9 [95% confidence interval (95% CI), 7.6-8.2] per 100 person-years prior to ART initiation, and 4.4 (95% CI, 4.2-4.4) per 100 person-years for patients receiving ART. In multivariate analyses, patients on ART in the first 3 months had a 57% higher risk of TB (hazard ratio: 1.57, 95% CI,...
Publisher, 2016
Background-Antiretroviral therapy (ART) reduces the risk of TB among people living with HIV (PLWH). With ART scale-up in sub-Saharan Africa over the past decade, incidence of TB among PLWH engaged in HIV care is predicted to decline. Methods-We conducted a retrospective analysis of routine clinical data from 168,330 PLWH receiving care at 35 facilities in Kenya, Tanzania, and Uganda during 2003-2012, participating in the East African region of the International Epidemiologic Databases to Evaluate AIDS (IeDEA). Temporal trends in facility-based annual TB incidence rates (per 100,000 person-years (PYs)) among PLWH and country-specific standardized TB incidence ratios (SIRs) using annual population-level TB incidence data from the World Health Organization (WHO) were computed between 2007 and 2012. We examined patient-and facility-level factors associated with incident TB using multivariable Cox models. Results-Overall, TB incidence rates among PLWH in care declined 5-fold between 2007 and 2012 from 5,960 to 985 per 100,000 PYs [p=0.0003] (Kenya: 7,552 to 1,115 [p=0.0007]; Tanzania: 7,153 to 635 [p=0.0025]; Uganda: 3,204 to 242 [p=0.018]). SIRs significantly decreased in the three countries, indicating a narrowing gap between incidence rates among PLWH and the general population. We observed lower hazards of incident TB among PLWH on ART and/or IPT and receiving care in facilities offering TB treatment on-site. Conclusions-Annual TB incidence rates among PLWH significantly declined during ART scale-up but remained higher than the general population. Increasing access to ART and IPT and co-location of HIV and TB treatment may further reduce TB incidence among PLWH.
PMC, 2016
Background-Antiretroviral therapy (ART) reduces the risk of TB among people living with HIV (PLWH). With ART scale-up in sub-Saharan Africa over the past decade, incidence of TB among PLWH engaged in HIV care is predicted to decline. Methods-We conducted a retrospective analysis of routine clinical data from 168,330 PLWH receiving care at 35 facilities in Kenya, Tanzania, and Uganda during 2003-2012, participating in the East African region of the International Epidemiologic Databases to Evaluate AIDS (IeDEA). Temporal trends in facility-based annual TB incidence rates (per 100,000 person-years (PYs)) among PLWH and country-specific standardized TB incidence ratios (SIRs) using annual population-level TB incidence data from the World Health Organization (WHO) were computed between 2007 and 2012. We examined patient-and facility-level factors associated with incident TB using multivariable Cox models. Results-Overall, TB incidence rates among PLWH in care declined 5-fold between 2007 and 2012 from 5,960 to 985 per 100,000 PYs [p=0.0003] (Kenya: 7,552 to 1,115 [p=0.0007]; Tanzania: 7,153 to 635 [p=0.0025]; Uganda: 3,204 to 242 [p=0.018]). SIRs significantly decreased in the three countries, indicating a narrowing gap between incidence rates among PLWH and the general population. We observed lower hazards of incident TB among PLWH on ART and/or IPT and receiving care in facilities offering TB treatment on-site. Conclusions-Annual TB incidence rates among PLWH significantly declined during ART scale-up but remained higher than the general population. Increasing access to ART and IPT and co-location of HIV and TB treatment may further reduce TB incidence among PLWH.
BMC Infectious Diseases
Background: The impact of HIV on TB, and the implications for TB control, has been acknowledged as a public health challenge. It is imperative therefore to assess the burden of HIV on TB patients as an indicator for monitoring the control efforts of the two diseases in this part of the world. This study aimed at determining the burden of HIV infection in TB patients. Methods: We conducted a retrospective review of TB registers in five districts of the Volta Region of Ghana. Prevalence of TB/HIV co-infection was determined. Bivariate and multivariate logistic regression were used to identify the predictors of HIV infection among TB patients and statistical significance was set at p-value <0.05. Results: Of the 1772 TB patients, 1633 (92.2%) were tested for HIV. The overall prevalence of TB/HIV co-infection was (18.2%; 95% CI: 16.4-20.1). The prevalence was significantly higher among females (24.1%; 95%CI: 20.8-27.7), compared to males (15.1%; 95% CI: 13.1-17.4) (p < 0.001) and among children <15 years of age (27.0%; 95% CI: 18.2-38.1), compared to the elderly ≥70 years (3.5%; 95% CI: 1.6-7.4) (p < 0.001). Treatment success rate was higher among patients with only TB (90%; 95% CI: 88.1-91.5) than among TB/HIV co-infected patients (77.0%; 95% CI: 71.7-81.7) (p < 0.001). Independent predictors of HIV infection were found to be: being female (AOR: 1.79; 95% CI: 1.38-2.13; p < 0.001); smear negative pulmonary TB (AOR: 1.84; 95% CI: 1.37-2.47; p < 0.001); and patients registered in Hohoe, Kadjebi, and Kpando districts with adjusted odds ratios of 1.69 (95% CI: 1.13-2.54; p = 0.011), 2.29 (95% CI: 1.46-3.57; p < 0.001), and 2.15 (95% CI: 1.44-3.21; p < 0.001) respectively. Patients ≥70 years of age and those registered in Keta Municipal were less likely to be HIV positive with odds ratios of 0.09 (95% CI: 0.04-0.26; p < 0.001) and 0.62 (95% CI: 0.38-0.99; p = 0.047) respectively. Conclusion: TB/HIV co-infection rate in five study districts of the Volta region is quite high, occurs more frequently in female patients than males; among smear negative pulmonary TB patients, and children <15 years of age. Findings also demonstrate that HIV co-infection affects TB treatment outcomes adversely. Strengthening the TB/HIV collaborative efforts is required in order to reduce the burden of co-infection in patients.
The international journal of tuberculosis and lung disease : the official journal of the International Union against Tuberculosis and Lung Disease, 2009
A community-based voluntary counseling and testing (VCT) center in Moshi, Tanzania. To compare rates of prior human immunodeficiency virus (HIV) testing among clients with and without previous tuberculosis (TB) treatment, and HIV seropositivity among those with and without current TB symptoms. Cross-sectional study of consecutive clients presenting for initial testing; sociodemographic and clinical data were collected via a structured questionnaire. HIV status was compared among clients with or without three or more TB-related symptoms: weight loss, fever, cough, hemoptysis or night sweats. Overall, 225 (3%) of 6583 VCT clients who responded to questions on previous TB treatment reported a history of TB, but only 34 (15%) reported previous HIV testing. This rate of HIV testing was not different from the rate among those clients without a history of TB (OR 0.77, P = 0.175). One hundred thirty-five (61%) clients with a history of TB were HIV-infected at VCT, compared with 17% of all c...