Journal Article > ResearchFull Text
East Afr Med J. 2017 March 31; Volume 6 (Issue 2); 383.; DOI:10.4102/ajlm.v6i2.383
Orikiriza P, Nyehangane D, Atwine D, Kisakye JJ, Kassaza K, et al.
East Afr Med J. 2017 March 31; Volume 6 (Issue 2); 383.; DOI:10.4102/ajlm.v6i2.383
BACKGROUND
To confirm presence of Mycobacterium tuberculosis complex, some tuberculosis culture laboratories still rely on para-nitrobenzoic acid (PNB), a traditional technique that requires sub-culturing of clinical isolates and two to three weeks to give results. Rapid identification tests have improved turnaround times for mycobacterial culture results. Considering the challenges of the PNB method, we assessed the performance of the SD Bioline TB Ag MPT64 assay by using PNB as gold standard to detect M. tuberculosis complex from acid-fast bacilli (AFB) positive cultures.
OBJECTIVES
The aim of this study was to determine the sensitivity, specificity and turnaround time of the SD MPT64 assay for identification of M. tuberculosis complex, in a setting with high prevalence of tuberculosis and HIV.
METHODS
A convenience sample of 690 patients, with tuberculosis symptoms, was enrolled at Epicentre Mbarara Research Centre between April 2010 and June 2011. The samples were decontaminated using NALC-NaOH and re-suspended sediments inoculated in Mycobacterium Growth Indicator Tubes (MGIT) media, then incubated at 37 °C for a maximum of eight weeks. A random sample of 50 known negative cultures and 50 non-tuberculous mycobacteria isolates were tested for specificity, while sensitivity was based on AFB positivity. The time required from positive culture to reporting of results was also assessed with PNB used as the gold standard.
RESULTS
Of the 138 cultures that were AFB-positive, the sensitivity of the SD MPT64 assay was 100.0% [95% CI: 97.3 - 100] and specificity was 100.0% (95% CI, 96.4 - 100). The median time from a specimen receipt to confirmation of strain was 10 days [IQR: 8-12] with SD MPT64 and 24 days [IQR: 22-26] with PNB.
CONCLUSION
The SD MPT64 assay is comparable to PNB for identification of M. tuberculosis complex and reduces the time to detection.
To confirm presence of Mycobacterium tuberculosis complex, some tuberculosis culture laboratories still rely on para-nitrobenzoic acid (PNB), a traditional technique that requires sub-culturing of clinical isolates and two to three weeks to give results. Rapid identification tests have improved turnaround times for mycobacterial culture results. Considering the challenges of the PNB method, we assessed the performance of the SD Bioline TB Ag MPT64 assay by using PNB as gold standard to detect M. tuberculosis complex from acid-fast bacilli (AFB) positive cultures.
OBJECTIVES
The aim of this study was to determine the sensitivity, specificity and turnaround time of the SD MPT64 assay for identification of M. tuberculosis complex, in a setting with high prevalence of tuberculosis and HIV.
METHODS
A convenience sample of 690 patients, with tuberculosis symptoms, was enrolled at Epicentre Mbarara Research Centre between April 2010 and June 2011. The samples were decontaminated using NALC-NaOH and re-suspended sediments inoculated in Mycobacterium Growth Indicator Tubes (MGIT) media, then incubated at 37 °C for a maximum of eight weeks. A random sample of 50 known negative cultures and 50 non-tuberculous mycobacteria isolates were tested for specificity, while sensitivity was based on AFB positivity. The time required from positive culture to reporting of results was also assessed with PNB used as the gold standard.
RESULTS
Of the 138 cultures that were AFB-positive, the sensitivity of the SD MPT64 assay was 100.0% [95% CI: 97.3 - 100] and specificity was 100.0% (95% CI, 96.4 - 100). The median time from a specimen receipt to confirmation of strain was 10 days [IQR: 8-12] with SD MPT64 and 24 days [IQR: 22-26] with PNB.
CONCLUSION
The SD MPT64 assay is comparable to PNB for identification of M. tuberculosis complex and reduces the time to detection.
Journal Article > ResearchSubscription Only
Burns. 2023 March 1; Volume 49 (Issue 7); 1756-1764.; DOI:10.1016/j.burns.2023.03.016
Martin T, Nanjebe D, Atwine D
Burns. 2023 March 1; Volume 49 (Issue 7); 1756-1764.; DOI:10.1016/j.burns.2023.03.016
BACKGROUND
Burn injuries are a major cause of morbidity and mortality within Low- and Middle-income countries (LMICs). Most of these burn injuries occur at home with children most at risk. The majority of burn related deaths and disability in LMICs have been described as preventable. Burns prevention requires adequate knowledge of the epidemiological characteristics and associated risk factors. The aim of this study was to assess the proportion of households with burn victims, the associated risk factors and knowledge of prevention strategies of burn injuries in Kakoba division, Mbarara city.
METHODS
We did a population based cross sectional survey of households in Kakoba division. This is the most populous division in Mbarara city. Face-to-face interviews were conducted using a pretested structured questionnaire. Descriptive analysis was performed to establish prevalence and knowledge of preventive strategies for household burns. Univariate and multivariate logistic regression models were fitted to establish the factors influencing burn injuries at household level.
RESULTS
Of the households in Kakoba Division, 41.2% had individuals who had previously sustained burn injuries within the household. Children were the most affected population with scald burns the most common type. The highest risk of burn injuries was associated with overcrowding in the households. Electricity as a light source was found to be protective. Candles and Kerosene lamps were the commonest alternative light sources. Majority 98% of the individuals in the households knew at least one burns prevention strategy with 93% practicing at least one.
CONCLUSION
Burns within the household are still high despite knowledge of risk factors with children being the most affected. Overcrowding still plays a significant role in household burn injuries. We therefore recommend closer supervision of children within the households. Cooking areas need to be properly designated and secured to limit access. Safer alternative light sources need to be explored such as solar lamps. Political leaders need to be involved in setting up and monitoring community-based fire safety practices to ensure compliance.
Burn injuries are a major cause of morbidity and mortality within Low- and Middle-income countries (LMICs). Most of these burn injuries occur at home with children most at risk. The majority of burn related deaths and disability in LMICs have been described as preventable. Burns prevention requires adequate knowledge of the epidemiological characteristics and associated risk factors. The aim of this study was to assess the proportion of households with burn victims, the associated risk factors and knowledge of prevention strategies of burn injuries in Kakoba division, Mbarara city.
METHODS
We did a population based cross sectional survey of households in Kakoba division. This is the most populous division in Mbarara city. Face-to-face interviews were conducted using a pretested structured questionnaire. Descriptive analysis was performed to establish prevalence and knowledge of preventive strategies for household burns. Univariate and multivariate logistic regression models were fitted to establish the factors influencing burn injuries at household level.
RESULTS
Of the households in Kakoba Division, 41.2% had individuals who had previously sustained burn injuries within the household. Children were the most affected population with scald burns the most common type. The highest risk of burn injuries was associated with overcrowding in the households. Electricity as a light source was found to be protective. Candles and Kerosene lamps were the commonest alternative light sources. Majority 98% of the individuals in the households knew at least one burns prevention strategy with 93% practicing at least one.
CONCLUSION
Burns within the household are still high despite knowledge of risk factors with children being the most affected. Overcrowding still plays a significant role in household burn injuries. We therefore recommend closer supervision of children within the households. Cooking areas need to be properly designated and secured to limit access. Safer alternative light sources need to be explored such as solar lamps. Political leaders need to be involved in setting up and monitoring community-based fire safety practices to ensure compliance.
Conference Material > Abstract
Atwine D
TB Research Dissemination Workshop, Epicentre Uganda. 2022 June 29
CONTEXT
In tuberculosis (TB) endemic countries, the screening and management of household contacts remains low including the uptake of TB preventive treatment (TPT). One of the challenges is the necessity for parents to bring children to the health facility for TB screening and TPT initiation. This study evaluated TPT initiation and completion in a community-based intervention compared to the facility-based standard of care among eligible household child contacts in Cameroon and Uganda.
METHODS
This is a multicentre cluster randomized controlled trial with twenty TB diagnostic and treatment facilities and catchment areas randomized between intervention and standard of care arms. Bacteriologically confirmed index cases were asked to household contacts. The intervention included screening for TB in household contacts by community health care workers with referral of symptomatic child contacts to a facility for TB diagnostic investigations; TPT initiation for child contacts—a negative symptom screen and <5 years irrespective of HIV status or 5-14 years for children living with HIV (CLHIV); and TPT follow-up through home visits. TPT completion was defined as > 90% drug intake within 120 days. We compared the proportion of declared child contacts <5 years or CLHIV (5- 14 years) who initiated and completed TPT between the two arms using a generalized linear mixed model.
RESULTS
Between November 2019 and December 2021, a total of 558 and 341 index cases were enrolled in the intervention and standard of care arms, declaring 1,895 and 1,005 child contacts, respectively. Of them, 383 index cases were enrolled in Uganda with a total of 1244 declared child contacts. Of the 941 and 459 potentially TPT eligible declared child contacts (<5 years or CLHIV aged 5-14 years) in the intervention and standard of care arms, 80% initiated and completed TPT in the intervention arm vs 61% in the standard of care arm, respectively.
CONCLUSION
Scaled-up, community-based interventions have the potential to improve TPT coverage and outcomes among child contacts in resource-limited settings.
These abstracts are not to be quoted for publication
In tuberculosis (TB) endemic countries, the screening and management of household contacts remains low including the uptake of TB preventive treatment (TPT). One of the challenges is the necessity for parents to bring children to the health facility for TB screening and TPT initiation. This study evaluated TPT initiation and completion in a community-based intervention compared to the facility-based standard of care among eligible household child contacts in Cameroon and Uganda.
METHODS
This is a multicentre cluster randomized controlled trial with twenty TB diagnostic and treatment facilities and catchment areas randomized between intervention and standard of care arms. Bacteriologically confirmed index cases were asked to household contacts. The intervention included screening for TB in household contacts by community health care workers with referral of symptomatic child contacts to a facility for TB diagnostic investigations; TPT initiation for child contacts—a negative symptom screen and <5 years irrespective of HIV status or 5-14 years for children living with HIV (CLHIV); and TPT follow-up through home visits. TPT completion was defined as > 90% drug intake within 120 days. We compared the proportion of declared child contacts <5 years or CLHIV (5- 14 years) who initiated and completed TPT between the two arms using a generalized linear mixed model.
RESULTS
Between November 2019 and December 2021, a total of 558 and 341 index cases were enrolled in the intervention and standard of care arms, declaring 1,895 and 1,005 child contacts, respectively. Of them, 383 index cases were enrolled in Uganda with a total of 1244 declared child contacts. Of the 941 and 459 potentially TPT eligible declared child contacts (<5 years or CLHIV aged 5-14 years) in the intervention and standard of care arms, 80% initiated and completed TPT in the intervention arm vs 61% in the standard of care arm, respectively.
CONCLUSION
Scaled-up, community-based interventions have the potential to improve TPT coverage and outcomes among child contacts in resource-limited settings.
These abstracts are not to be quoted for publication
Journal Article > ResearchFull Text
Int J Tuberc Lung Dis. 2016 June 1; Volume 20 (Issue 6); 832-838.; DOI:10.5588/ijtld.15.0577
Jindani A, Borgulya G, de Patino IW, Gonzales T, de Fernandes RA, et al.
Int J Tuberc Lung Dis. 2016 June 1; Volume 20 (Issue 6); 832-838.; DOI:10.5588/ijtld.15.0577
SETTING
Randomised Phase IIB clinical trial.
OBJECTIVES
To assess whether increasing the dose of rifampicin (RMP) from 10 mg/kg to 15 or 20 mg/kg results in an increase in grade 3 or 4 hepatic adverse events and/or serious adverse events (SAE).
METHODS
Three hundred human immunodeficiency virus negative patients with newly diagnosed microscopy-positive pulmonary tuberculosis (TB) were randomly assigned to one of three regimens: 1) the control regimen (R10), comprising daily ethambutol (EMB), isoniazid (INH), RMP and pyrazinamide for 8 weeks, followed by INH and RMP daily for 18 weeks; 2) Study Regimen 1 (R15), as above, with the RMP dose increased to 15 mg/kg body weight daily for the first 16 weeks; and 3) Study Regimen 2 (R20), as above, with RMP increased to 20 mg/kg. Serum alanine transferase (ALT) levels were measured at regular intervals.
RESULTS
There were seven grade 3 increases in ALT levels, 1/100 (1%) among R10 arm patients, 2/100 (2%) in the R15 arm and 4/100 (4%) in the R20 arm (trend test P = 0.15). One (R15) patient developed jaundice, requiring treatment modification. There were no grade 4 ALT increases. There was a non-significant increase in culture negativity at 8 weeks with increasing RMP dosage: 75% (69/92) in R10, 82.5% (66/80) in R15 and 83.1% (76/91) R20 patients (P = 0.16).
CONCLUSIONS
No significant increase in adverse events occurred when the RMP dose was increased from 10 mg/kg to 15 mg/kg or 20 mg/kg.
Randomised Phase IIB clinical trial.
OBJECTIVES
To assess whether increasing the dose of rifampicin (RMP) from 10 mg/kg to 15 or 20 mg/kg results in an increase in grade 3 or 4 hepatic adverse events and/or serious adverse events (SAE).
METHODS
Three hundred human immunodeficiency virus negative patients with newly diagnosed microscopy-positive pulmonary tuberculosis (TB) were randomly assigned to one of three regimens: 1) the control regimen (R10), comprising daily ethambutol (EMB), isoniazid (INH), RMP and pyrazinamide for 8 weeks, followed by INH and RMP daily for 18 weeks; 2) Study Regimen 1 (R15), as above, with the RMP dose increased to 15 mg/kg body weight daily for the first 16 weeks; and 3) Study Regimen 2 (R20), as above, with RMP increased to 20 mg/kg. Serum alanine transferase (ALT) levels were measured at regular intervals.
RESULTS
There were seven grade 3 increases in ALT levels, 1/100 (1%) among R10 arm patients, 2/100 (2%) in the R15 arm and 4/100 (4%) in the R20 arm (trend test P = 0.15). One (R15) patient developed jaundice, requiring treatment modification. There were no grade 4 ALT increases. There was a non-significant increase in culture negativity at 8 weeks with increasing RMP dosage: 75% (69/92) in R10, 82.5% (66/80) in R15 and 83.1% (76/91) R20 patients (P = 0.16).
CONCLUSIONS
No significant increase in adverse events occurred when the RMP dose was increased from 10 mg/kg to 15 mg/kg or 20 mg/kg.
Journal Article > ResearchFull Text
Int J Tuberc Lung Dis. 2015 May 1; Volume 19 (Issue 5); 558-564.; DOI:10.5588/ijtld.14.0810
Atwine D, Nansumba M, Orikiriza P, Riera M, Nackers F, et al.
Int J Tuberc Lung Dis. 2015 May 1; Volume 19 (Issue 5); 558-564.; DOI:10.5588/ijtld.14.0810
SETTING
Tuberculosis (TB) diagnosis is challenging in patients who are unable to produce sputum. The string test, a method for retrieving enteropathogens, is a potential alternative diagnostic tool.
OBJECTIVES
To compare the TB detection yield and tolerability of the string test and that of sputum induction in adults with presumed TB in Uganda.
DESIGN
Cross-sectional study. String test and sputum induction were performed consecutively in patients unable to produce sputum. The string was removed after a 2-h intra-gastric downtime. Sputum induction used nebulised 5% saline for 20 min. Light-emitting diode fluorescence microscopy, Löwenstein-Jensen and MGIT culture were performed on all specimens, and the Xpert® MTB/RIF assay on a subset. Tolerability questionnaires were administered.
RESULTS
Of 210 patients included in the study, 59% were human immunodeficiency virus (HIV) positive and 50 (23.8%) were diagnosed with TB. Of these, 48 (96.0%) were detected with the string test and 46 (92.0%) with sputum induction. In patients with specimens collected using both methods for paired analysis, the yield of microscopy detection with the string test was 13.8% (26/188) vs. 13.3% (25/188) with sputum induction (P = 1.0). The yield increased to 22.9% (42/183) using culture for string test vs. 24.6% (45/183) for sputum induction (P = 0.37). Xpert detected TB in 15/96 (15.6%) patients with the string test vs. 17/96 (17.7%) with sputum induction (P = 0.62). Tolerability was comparable.
CONCLUSIONS
The string test was well tolerated and provided similar yields to sputum induction, offering a viable alternative in resource-limited settings with minimal risk of transmission.
Tuberculosis (TB) diagnosis is challenging in patients who are unable to produce sputum. The string test, a method for retrieving enteropathogens, is a potential alternative diagnostic tool.
OBJECTIVES
To compare the TB detection yield and tolerability of the string test and that of sputum induction in adults with presumed TB in Uganda.
DESIGN
Cross-sectional study. String test and sputum induction were performed consecutively in patients unable to produce sputum. The string was removed after a 2-h intra-gastric downtime. Sputum induction used nebulised 5% saline for 20 min. Light-emitting diode fluorescence microscopy, Löwenstein-Jensen and MGIT culture were performed on all specimens, and the Xpert® MTB/RIF assay on a subset. Tolerability questionnaires were administered.
RESULTS
Of 210 patients included in the study, 59% were human immunodeficiency virus (HIV) positive and 50 (23.8%) were diagnosed with TB. Of these, 48 (96.0%) were detected with the string test and 46 (92.0%) with sputum induction. In patients with specimens collected using both methods for paired analysis, the yield of microscopy detection with the string test was 13.8% (26/188) vs. 13.3% (25/188) with sputum induction (P = 1.0). The yield increased to 22.9% (42/183) using culture for string test vs. 24.6% (45/183) for sputum induction (P = 0.37). Xpert detected TB in 15/96 (15.6%) patients with the string test vs. 17/96 (17.7%) with sputum induction (P = 0.62). Tolerability was comparable.
CONCLUSIONS
The string test was well tolerated and provided similar yields to sputum induction, offering a viable alternative in resource-limited settings with minimal risk of transmission.
Journal Article > ResearchFull Text
J Acquir Immune Defic Syndr; JAIDS. 2024 April 15; Volume 95 (Issue 5); 431-438.; DOI:10.1097/QAI.0000000000003379
Youngui BT, Atwine D, Otai D, Vasiliu A, Ssekyanzi B, et al.
J Acquir Immune Defic Syndr; JAIDS. 2024 April 15; Volume 95 (Issue 5); 431-438.; DOI:10.1097/QAI.0000000000003379
INTRODUCTION
People living with HIV are considered at higher risk of developing severe forms of tuberculosis (TB) disease. Providing HIV testing to TB-exposed people is therefore critical. We present the results of integrating HIV testing into a community-based intervention for household TB contact management in Cameroon and Uganda.
METHODS
Trained community health workers visited the households of index patients with TB identified in 3 urban/semiurban and 6 rural districts or subdistricts as part of a cluster-randomized trial and provided TB screening to all household contacts. Voluntary HIV counseling and testing were offered to contacts aged 5 years or older with unknown HIV status. We describe the cascade of care for HIV testing and the factors associated with the acceptance of HIV testing.
RESULTS
Overall, 1983 household contacts aged 5 years or older were screened for TB. Of these contacts, 1652 (83.3%) did not know their HIV status, 1457 (88.2%) accepted HIV testing, and 1439 (98.8%) received testing. HIV testing acceptance was lower among adults than children [adjusted odds ratio (aOR) = 0.35, 95% confidence interval (CI): 0.22 to 0.55], those living in household of an HIV-positive vs HIV-negative index case (aOR = 0.56, 95% CI: 0.38 to 0.83), and contacts requiring a reassessment visit after the initial TB screening visit vs asymptomatic contacts (aOR = 0.20, 95% CI: 0.06 to 0.67) and was higher if living in Uganda vs Cameroon (aOR = 4.54, 95% CI: 1.17 to 17.62) or if another contact of the same index case was tested for HIV (aOR = 9.22, 95% CI: 5.25 to 16.18).
CONCLUSION
HIV testing can be integrated into community-based household TB contact screening and is well-accepted.
People living with HIV are considered at higher risk of developing severe forms of tuberculosis (TB) disease. Providing HIV testing to TB-exposed people is therefore critical. We present the results of integrating HIV testing into a community-based intervention for household TB contact management in Cameroon and Uganda.
METHODS
Trained community health workers visited the households of index patients with TB identified in 3 urban/semiurban and 6 rural districts or subdistricts as part of a cluster-randomized trial and provided TB screening to all household contacts. Voluntary HIV counseling and testing were offered to contacts aged 5 years or older with unknown HIV status. We describe the cascade of care for HIV testing and the factors associated with the acceptance of HIV testing.
RESULTS
Overall, 1983 household contacts aged 5 years or older were screened for TB. Of these contacts, 1652 (83.3%) did not know their HIV status, 1457 (88.2%) accepted HIV testing, and 1439 (98.8%) received testing. HIV testing acceptance was lower among adults than children [adjusted odds ratio (aOR) = 0.35, 95% confidence interval (CI): 0.22 to 0.55], those living in household of an HIV-positive vs HIV-negative index case (aOR = 0.56, 95% CI: 0.38 to 0.83), and contacts requiring a reassessment visit after the initial TB screening visit vs asymptomatic contacts (aOR = 0.20, 95% CI: 0.06 to 0.67) and was higher if living in Uganda vs Cameroon (aOR = 4.54, 95% CI: 1.17 to 17.62) or if another contact of the same index case was tested for HIV (aOR = 9.22, 95% CI: 5.25 to 16.18).
CONCLUSION
HIV testing can be integrated into community-based household TB contact screening and is well-accepted.
Journal Article > ResearchFull Text
Int J Tuberc Lung Dis. 2016 August 1; Volume 20 (Issue 8); 1113-1117.; DOI:10.5588/ijtld.15.0691
Atwebembeire J, Orikiriza P, Bonnet MMB, Atwine D, Katawera V, et al.
Int J Tuberc Lung Dis. 2016 August 1; Volume 20 (Issue 8); 1113-1117.; DOI:10.5588/ijtld.15.0691
SETTING
Although it is now widely used for tuberculosis (TB) diagnosis, Xpert® MTB/RIF availability remains inadequate in low-resource settings. Moreover, its accuracy in testing stored samples from non-expectorating patients has not been evaluated.
OBJECTIVE
To assess the performance of Xpert in frozen samples of induced sputum (IS) and sputum from string test (ST) from non-expectorating individuals with presumed TB.
DESIGN
This was a laboratory-based study of 377 ST and IS samples collected between March 2010 and March 2013 at a referral hospital in Uganda. Samples were decontaminated, centrifuged and cultured, and the resultant samples were frozen at −20°C before Xpert evaluation.
RESULTS
TB was detected in ST and IS samples from 19/163 (11.7%) children and 63/201 (29.4%) adults using culture. Xpert sensitivity in frozen sediments from children was 37.5% (95%CI 8.5–75.5) in ST and 41.7% (95%CI 15.2–72.3) in IS samples, with specificities of respectively 100% (95%CI 94.9–100) and 98.6% (95%CI 92.7–100). In adults, sensitivity was respectively 50% (95%CI 31.3–68.7) and 48.5% (95%CI 30.8–66.4) in ST and IS samples, with specificities of respectively 100% (95%CI 95.5–100) and 98.6% (95%CI 92.4–100).
CONCLUSION
Given these results, and particularly the high specificity, the use of Xpert on frozen ST and IS sediment samples from both children and adults is promising.
Although it is now widely used for tuberculosis (TB) diagnosis, Xpert® MTB/RIF availability remains inadequate in low-resource settings. Moreover, its accuracy in testing stored samples from non-expectorating patients has not been evaluated.
OBJECTIVE
To assess the performance of Xpert in frozen samples of induced sputum (IS) and sputum from string test (ST) from non-expectorating individuals with presumed TB.
DESIGN
This was a laboratory-based study of 377 ST and IS samples collected between March 2010 and March 2013 at a referral hospital in Uganda. Samples were decontaminated, centrifuged and cultured, and the resultant samples were frozen at −20°C before Xpert evaluation.
RESULTS
TB was detected in ST and IS samples from 19/163 (11.7%) children and 63/201 (29.4%) adults using culture. Xpert sensitivity in frozen sediments from children was 37.5% (95%CI 8.5–75.5) in ST and 41.7% (95%CI 15.2–72.3) in IS samples, with specificities of respectively 100% (95%CI 94.9–100) and 98.6% (95%CI 92.7–100). In adults, sensitivity was respectively 50% (95%CI 31.3–68.7) and 48.5% (95%CI 30.8–66.4) in ST and IS samples, with specificities of respectively 100% (95%CI 95.5–100) and 98.6% (95%CI 92.4–100).
CONCLUSION
Given these results, and particularly the high specificity, the use of Xpert on frozen ST and IS sediment samples from both children and adults is promising.
Journal Article > ResearchFull Text
Int J Tuberc Lung Dis. 2017 August 1; Volume 21 (Issue 8); 862-868.; DOI:10.5588/ijtld.16.0889
Bonnet MMB, Kyakwera C, Kyomugasho N, Atwine D, Mugabe F, et al.
Int J Tuberc Lung Dis. 2017 August 1; Volume 21 (Issue 8); 862-868.; DOI:10.5588/ijtld.16.0889
SETTING
Screening and isoniazid preventive therapy (IPT) of child contacts of tuberculosis (TB) patients is poorly implemented in resource-limited countries, in part due to difficulties in TB diagnosis in children.
OBJECTIVE
To assess the feasibility and yield of hospital-based screening and IPT in Uganda, and to evaluate the utility of symptom-based screening.
DESIGN
Household child (age <5 years) contacts of adults with pulmonary TB were assessed for TB or latent tuberculous infection (LTBI). Children classified as ‘LTBI' or ‘uninfected' were prescribed IPT and followed for 9 months. Screening algorithms based on combinations of symptoms associated with TB were constructed post hoc, and their performance evaluated against a radiological-based reference standard.
RESULTS
Of 281 contacts (median age 33 months), 44 (15.7%) started anti-tuberculosis treatment and 234 (83.3%) received IPT, 80.3% of whom completed a 6-month course. After adjustment for age and human immunodeficiency virus status, cough (aOR 4.10, 95%CI 1.39–12.11) and reduced playfulness (aOR 7.79, 95%CI 2.12–25.18) were associated with radiological TB. Screening based on cough or reduced playfulness had a sensitivity of 81.8% and a negative predictive value of 97.6%.
CONCLUSION
Hospital-based screening appears to be feasible, and confirms the potential utility of symptom-based screening to select children for IPT and those for further investigations.
Screening and isoniazid preventive therapy (IPT) of child contacts of tuberculosis (TB) patients is poorly implemented in resource-limited countries, in part due to difficulties in TB diagnosis in children.
OBJECTIVE
To assess the feasibility and yield of hospital-based screening and IPT in Uganda, and to evaluate the utility of symptom-based screening.
DESIGN
Household child (age <5 years) contacts of adults with pulmonary TB were assessed for TB or latent tuberculous infection (LTBI). Children classified as ‘LTBI' or ‘uninfected' were prescribed IPT and followed for 9 months. Screening algorithms based on combinations of symptoms associated with TB were constructed post hoc, and their performance evaluated against a radiological-based reference standard.
RESULTS
Of 281 contacts (median age 33 months), 44 (15.7%) started anti-tuberculosis treatment and 234 (83.3%) received IPT, 80.3% of whom completed a 6-month course. After adjustment for age and human immunodeficiency virus status, cough (aOR 4.10, 95%CI 1.39–12.11) and reduced playfulness (aOR 7.79, 95%CI 2.12–25.18) were associated with radiological TB. Screening based on cough or reduced playfulness had a sensitivity of 81.8% and a negative predictive value of 97.6%.
CONCLUSION
Hospital-based screening appears to be feasible, and confirms the potential utility of symptom-based screening to select children for IPT and those for further investigations.
Journal Article > ResearchFull Text
Lancet Global Health. 2023 October 30; Online ahead of print (Issue 23); S2214-109X(23)00451-5.; DOI:10.1016/S2214-109X(23)00451-5
Mafirakureva N, Tchounga BK, Mukherjee S, Youngui BT, Ssekyanzi B, et al.
Lancet Global Health. 2023 October 30; Online ahead of print (Issue 23); S2214-109X(23)00451-5.; DOI:10.1016/S2214-109X(23)00451-5
BACKGROUND
WHO recommends household contact management (HCM) including contact screening and tuberculosis-preventive treatment (TPT) for eligible children. The CONTACT trial found increased TPT initiation and completion rates when community health workers were used for HCM in Cameroon and Uganda.
METHODS
We did a cost-utility analysis of the CONTACT trial using a health-system perspective to estimate the health impact, health-system costs, and cost-effectiveness of community-based versus facility-based HCM models of care. A decision-analytical modelling approach was used to evaluate the cost-effectiveness of the intervention compared with the standard of care using trial data on cascade of care, intervention effects, and resource use. Health outcomes were based on modelled progression to tuberculosis, mortality, and discounted disability-adjusted life-years (DALYs) averted. Health-care resource use, outcomes, costs (2021 US$), and cost-effectiveness are presented.
FINDINGS
For every 1000 index patients diagnosed with tuberculosis, the intervention increased the number of TPT courses by 1110 (95% uncertainty interval 894 to 1227) in Cameroon and by 1078 (796 to 1220) in Uganda compared with the control model. The intervention prevented 15 (-3 to 49) tuberculosis deaths in Cameroon and 10 (-20 to 33) in Uganda. The incremental cost-effectiveness ratio was $620 per DALY averted in Cameroon and $970 per DALY averted in Uganda.
INTERPRETATION
Community-based HCM approaches can substantially reduce child tuberculosis deaths and in our case would be considered cost-effective at willingness-to-pay thresholds of $1000 per DALY averted. Their impact and cost-effectiveness are likely to be greatest where baseline HCM coverage is lowest.
WHO recommends household contact management (HCM) including contact screening and tuberculosis-preventive treatment (TPT) for eligible children. The CONTACT trial found increased TPT initiation and completion rates when community health workers were used for HCM in Cameroon and Uganda.
METHODS
We did a cost-utility analysis of the CONTACT trial using a health-system perspective to estimate the health impact, health-system costs, and cost-effectiveness of community-based versus facility-based HCM models of care. A decision-analytical modelling approach was used to evaluate the cost-effectiveness of the intervention compared with the standard of care using trial data on cascade of care, intervention effects, and resource use. Health outcomes were based on modelled progression to tuberculosis, mortality, and discounted disability-adjusted life-years (DALYs) averted. Health-care resource use, outcomes, costs (2021 US$), and cost-effectiveness are presented.
FINDINGS
For every 1000 index patients diagnosed with tuberculosis, the intervention increased the number of TPT courses by 1110 (95% uncertainty interval 894 to 1227) in Cameroon and by 1078 (796 to 1220) in Uganda compared with the control model. The intervention prevented 15 (-3 to 49) tuberculosis deaths in Cameroon and 10 (-20 to 33) in Uganda. The incremental cost-effectiveness ratio was $620 per DALY averted in Cameroon and $970 per DALY averted in Uganda.
INTERPRETATION
Community-based HCM approaches can substantially reduce child tuberculosis deaths and in our case would be considered cost-effective at willingness-to-pay thresholds of $1000 per DALY averted. Their impact and cost-effectiveness are likely to be greatest where baseline HCM coverage is lowest.
Journal Article > ResearchFull Text
Lancet Global Health. 2023 October 30; Online ahead of print; S2214-109X(23)00430-8.; DOI:10.1016/S2214-109X(23)00430-8
Bonnet MMB, Vasiliu A, Tchounga BK, Cuer B, Fielding K, et al.
Lancet Global Health. 2023 October 30; Online ahead of print; S2214-109X(23)00430-8.; DOI:10.1016/S2214-109X(23)00430-8
BACKGROUND
Globally, the uptake of tuberculosis-preventive treatment (TPT) among children with household tuberculosis contact remains low, partly due to the necessity of bringing children to health facilities for investigations. This study aimed to evaluate the effect on TPT initiation and completion of community-based approaches to tuberculosis contact investigations in Cameroon and Uganda.
METHODS
We did a parallel, cluster-randomised, controlled trial across 20 clusters (consisting of 25 district hospitals and primary health centres) in Cameroon and Uganda, which were randomised (1:1) to receive a community-based approach (intervention group) or standard-of-care facility-based approach to contact screening and management (control group). The community-based approach consisted of symptom-based tuberculosis screening of all household contacts by community health workers at the household, with referral of symptomatic contacts to local facilities for investigations. Initiation of TPT (3-month course of rifampicin-isoniazid) was done by a nurse in the household, and home visits for TPT follow-up were done by community health workers. Index patients were people aged 15 years or older with bacteriologically confirmed, drug-susceptible, pulmonary tuberculosis diagnosed less than 1 month before inclusion and who declared at least one child or young adolescent (aged 0-14 years) household contact. The primary endpoint was the proportion of declared child contacts in the TPT target group (those aged <5 years irrespective of HIV status, and children aged 5-14 years living with HIV) who commenced and completed TPT, assessed in the modified intention-to-treat population (excluding enrolled index patients and their contacts who did not fit the eligibility criteria). Descriptive cascade of care assessment and generalised linear mixed modelling were used for comparison. This study is registered with ClinicalTrials.gov (NCT03832023).
FINDINGS
The study included nine clusters in the intervention group (after excluding one cluster that did not enrol any index patients for >2 months) and ten in the control group. Between Oct 14, 2019 and Jan 13, 2022, 2894 child contacts were declared by 899 index patients with bacteriologically confirmed tuberculosis. Among all child contacts declared, 1548 (81·9%) of 1889 in the intervention group and 475 (47·3%) of 1005 in the control group were screened for tuberculosis. 1400 (48·4%) child contacts were considered to be in the TPT target group: 941 (49·8%) of 1889 in the intervention group and 459 (45·7%) of 1005 in the control group. In the TPT target group, TPT was commenced and completed in 752 (79·9%) of 941 child contacts in the intervention group and 283 (61·7%) of 459 in the control group (odds ratio 3·06 [95% CI 1·24-7·53]).
INTERPRETATION
A community-based approach using community health workers can significantly increase contact investigation coverage and TPT completion among eligible child contacts in a tuberculosis-endemic setting.
Globally, the uptake of tuberculosis-preventive treatment (TPT) among children with household tuberculosis contact remains low, partly due to the necessity of bringing children to health facilities for investigations. This study aimed to evaluate the effect on TPT initiation and completion of community-based approaches to tuberculosis contact investigations in Cameroon and Uganda.
METHODS
We did a parallel, cluster-randomised, controlled trial across 20 clusters (consisting of 25 district hospitals and primary health centres) in Cameroon and Uganda, which were randomised (1:1) to receive a community-based approach (intervention group) or standard-of-care facility-based approach to contact screening and management (control group). The community-based approach consisted of symptom-based tuberculosis screening of all household contacts by community health workers at the household, with referral of symptomatic contacts to local facilities for investigations. Initiation of TPT (3-month course of rifampicin-isoniazid) was done by a nurse in the household, and home visits for TPT follow-up were done by community health workers. Index patients were people aged 15 years or older with bacteriologically confirmed, drug-susceptible, pulmonary tuberculosis diagnosed less than 1 month before inclusion and who declared at least one child or young adolescent (aged 0-14 years) household contact. The primary endpoint was the proportion of declared child contacts in the TPT target group (those aged <5 years irrespective of HIV status, and children aged 5-14 years living with HIV) who commenced and completed TPT, assessed in the modified intention-to-treat population (excluding enrolled index patients and their contacts who did not fit the eligibility criteria). Descriptive cascade of care assessment and generalised linear mixed modelling were used for comparison. This study is registered with ClinicalTrials.gov (NCT03832023).
FINDINGS
The study included nine clusters in the intervention group (after excluding one cluster that did not enrol any index patients for >2 months) and ten in the control group. Between Oct 14, 2019 and Jan 13, 2022, 2894 child contacts were declared by 899 index patients with bacteriologically confirmed tuberculosis. Among all child contacts declared, 1548 (81·9%) of 1889 in the intervention group and 475 (47·3%) of 1005 in the control group were screened for tuberculosis. 1400 (48·4%) child contacts were considered to be in the TPT target group: 941 (49·8%) of 1889 in the intervention group and 459 (45·7%) of 1005 in the control group. In the TPT target group, TPT was commenced and completed in 752 (79·9%) of 941 child contacts in the intervention group and 283 (61·7%) of 459 in the control group (odds ratio 3·06 [95% CI 1·24-7·53]).
INTERPRETATION
A community-based approach using community health workers can significantly increase contact investigation coverage and TPT completion among eligible child contacts in a tuberculosis-endemic setting.