Tuberculosis contact investigation in low- and middle-income countries: standardized definitions and indicators.

There is a need for better utilization of program data for global tuberculosis (TB) control. Significant information could be gained from data collected by TB programs that could supplement traditional sources of evidence and contribute to policy development. For this operational information to be useful, it must be collected in a uniform manner, using standardized definitions and approaches to evaluation. As an example of an approach to uniformity in generating useful program data, we present recommendations for the standardization of definitions and indicators for the investigation of contacts of persons with infectious TB in low- and middle-income countries.

Programmatic approaches to screening for active tuberculosis.

Passive case finding, the detection of tuberculosis (TB) cases among persons presenting to health facilities with symptoms suggestive of TB, has remained the principal public health approach for TB diagnosis. While this approach, in combination with improved treatment, has led to substantial global progress, the overall epidemiological impact has been inadequate. Stagnating case notifications and sluggish decline in incidence prompt the pursuit of a more active approach to TB case detection. Screening among contacts of TB patients and people living with human immunodeficiency virus infection, long recommended, needs scaling up. Screening in other risk groups may also be considered, depending on the epidemiological situation. The World Health Organization (WHO) has recently produced recommendations on systematic screening for active TB, which set out principles and provide guidance on the prioritisation of risk groups for screening and choice of screening and diagnostic algorithms. With a view to help translate WHO recommendations into practice, this concluding article of the State of the Art series discusses programmatic approaches. Published literature is scanty. However, considerable field experience exists to draw important lessons. Cautioning against a hasty pursuit of active case finding, the article stresses that programmatic implementation of TB screening requires a systematic approach. Important considerations should include setting clear goals and objectives based on a thorough assessment of the situation; considering the place of TB screening in the overall approach to enhancing TB detection; identifying and prioritising risk groups; choosing appropriate screening and diagnostic algorithms; and pursuing setting-specific implementation strategies with engagement of relevant partners, due attention to ethical considerations and built-in monitoring and evaluation.

A rapid assessment of prevailing policies on tuberculosis contact investigation.

Contact investigation contributes to improving early case detection of tuberculosis (TB). However, its implementation in low-income, high TB burden countries remains limited. A multicountry survey of contact investigation policies was conducted to evaluate the extent of their implementation. Our results showed significant heterogeneity in definitions and procedures, with over 25% of countries unable to provide a clear definition of a contact. Estimates indicate that routine implementation of contact investigation policies globally could help detection of over a quarter of a million cases. International guidelines should be developed to support national TB programmes to initiate and scale up systematic TB contact investigation.

Tuberculosis and noncommunicable diseases: neglected links and missed opportunities.

Globally, the incidence of tuberculosis (TB) is declining very slowly, and the noncommunicable disease (NCD) burden for many countries is steadily increasing. Several NCDs, such as diabetes mellitus, alcohol use disorders and smoking-related conditions, are responsible for a significant proportion of TB cases globally, and in the European region, represent a larger attributable fraction for TB disease than HIV. Concrete steps are needed to address NCDs and their risk factors. We reviewed published studies involving TB and NCDs, and present a review and discussion of how they are linked, the implications for case detection and management, and how prevention efforts may be strengthened by integration of services. These NCDs put patients at increased risk for developing TB and at risk for poor treatment outcomes. However, they also present an opportunity to provide better care through increased case-detection activities, improved clinical management and better access to care for both TB and NCDs. Hastening the global decline in TB incidence may be assisted by strengthening these types of activities.

Consultation meeting on tuberculosis and diabetes mellitus: meeting summary and recommendations.

The steadily growing epidemic of diabetes mellitus (DM) poses a threat for global tuberculosis (TB) control. Previous studies have identified an important association between DM and TB. However, these studies have limitations: very few were carried out in low-income countries, and none in Africa, raising uncertainty about the strength of the DM-TB association in these settings, and many critical questions remain unanswered. As a result of these questions and uncertainties, the International Union Against Tuberculosis and Lung Disease (The Union), the World Diabetes Foundation and the World Health Organization Stop TB Department undertook a series of consultations as of January 2009. A systematic review and meta-analysis was undertaken by the Department of Epidemiology, Harvard School of Public Health between May and August 2009, and a consultation meeting involving the experts who reviewed the report took place at The Union Headquarters in Paris on 6 and 7 November 2009. This paper constitutes a summary report of the findings, the research gaps and prioritised areas of research, and the recommendations from that meeting.

TB contact investigations: 12 years of experience in the National TB Programme, Morocco 1993-2004.

We reviewed data collected from 1993 to 2004 as part of the routine activities of the national tuberculosis (TB) control programme (NTP) in Morocco. More than 1 million household TB contacts were identified in approximately 200,000 investigations. On average, 77% of identified contacts were screened every year; overall prevalence was 2.5%. The proportion of TB cases identified in household contacts of registered cases was 5.6%. This was significantly higher in children under 10 years and in patients registered and diagnosed with symptomatic primary complex. Performing TB contact investigations as part of the routine activities of NTP services is feasible in low-middle-income countries.

Results of the feasibility test of the Practical Approach to Lung Health in the Syrian Arab Republic.

We assessed implementation of the Practical Approach to Lung Health (PAL) in primary care facilities in the Syrian Arab Republic and its short-term impact on respiratory care in patients aged 5+ years. After training on PAL for 76 general practitioners in 75 health centres, referrals and sputum smear examinations for patients increased. The mean number of drugs prescribed per patient decreased by 14.8% and that of antibiotics by 33.3%, while prescriptions for inhaled medications increased. The mean cost of drug prescriptions fell by 26.2%.

Training on the Practical Approach to Lung Health: effect on drug prescribing in PHC settings in Jordan.

This study assessed whether training physicians on the Practical Approach to Lung Health (PAL) reduces drug prescribing and the cost of drugs prescribed to respiratory patients in the primary health care setting. Data were compared before and after training general practitioners on standard guidelines for case management of respiratory conditions in primary care. A total of 56 general practitioners practising in 25 health centres in 3 out of 12 governorates of Jordan participated in both the baseline survey (n = 6260 respiratory patients) and the impact survey (n = 2709 patients). Training in PAL decreased by 12.2% the number of drugs prescribed per patient, increased the prescription of inhaled medications and reduced the mean cost of a drug prescription per patient by 8.7%.

Feasibility test results of the Practical Approach to Lung Health in Bishkek, Kyrgyzstan.

SETTING: Ambulatory health centres in Bishkek, Kyrgyzstan. OBJECTIVE: To assess the results of training family doctors in Practical Approach to Lung Health (PAL) techniques. DESIGN: Comparison of the results of two surveys, before (baseline) and after (impact) training on PAL guidelines. Both surveys were carried out according to the same protocol. RESULTS: A total of 86 family physicians working in three ambulatory health centres participated in both surveys. Respectively 893 and 992 respiratory patients were registered in the baseline and impact surveys. Baseline survey patients had longer duration of symptoms, were older and had more concomitant health conditions than impact survey patients. Findings suggest that PAL training has resulted in a decrease by one third in referrals to hospital or specialists or for diagnostic tests. Data do not show any improvement in tuberculosis case detection. However, in the impact survey, the number of drugs prescribed per patient decreased by 13.6% and the average cost of prescription of any drug per patient was reduced by 32.2%. CONCLUSION: The study suggests that training in standardised PAL guidelines is likely to reduce referral as well as drug prescription costs for respiratory patients. These findings need to be confirmed by further studies.

Development process of the Practical Approach to Lung Health in Kyrgyzstan.

The Practical Approach to Lung Health (PAL) strategy was adopted by the Ministry of Health of Kyrgyzstan to improve the quality of case management of priority respiratory illnesses, including tuberculosis (TB). The process of development and implementation of the strategy is described in the present study. The World Health Organization stepwise framework was adapted and used to initiate the PAL strategy within the Kyrgyzstan primary health care (PHC) system. The process followed 10 steps which included the government decision to support PAL development, and the establishment of a national working group in charge of adapting guidelines, developing training materials and testing the feasibility and impact of the guidelines. On the basis of the test results, the guidelines and training materials were revised and a national PAL implementation plan was developed. The ongoing health sector reform which focuses, in priority, on strengthening PHC services and the assistance from the government of Finland, generated favourable political, technical and financial circumstances for the development and implementation of the PAL strategy.

TB contact investigations: 12 years of experience in the National TB Programme, Morocco 1993-2004

We reviewed data collected from 1993 to 2004 as part of the routine activities of the national tuberculosis [TB] control programme [NTP] in Morocco. More than 1 million household TB contacts were identified in approximately 200 000 investigations. On average, 77% of identified contacts were screened every year; overall prevalence was 2.5%. The proportion of TB cases identified in household contacts of registered cases was 5.6%. This was significantly higher in children under 10 years and in patients registered and diagnosed with symptomatic primary complex. Performing TB contact investigations as part of the routine activities of NTP services is feasible in low-middle-income countries

Training on the Practical Approach to Lung Health: effect on drug prescribing in PHC settings in Jordan

This study assessed whether training physicians on the Practical Approach to Lung Health [PAL] reduces drug prescribing and the cost of drugs prescribed to respiratory patients in the primary health care setting. Data were compared before and after training general practitioners on standard guidelines for case management of respiratory conditions in primary care. A total of 56 general practitioners practising in 25 health centres in 3 out of 12 governorates of Jordan participated in both the baseline survey [n = 6260 respiratory patients] and the impact survey [n = 2709 patients]. Training in PAL decreased by 12.2% the number of drugs prescribed per patient, increased the prescription of inhaled medications and reduced the mean cost of a drug prescription per patient by 8.7%

Knowledge, attitudes and beliefs about tuberculosis in urban Morocco.

We sought to characterize conceptions of tuberculosis (TB) in an urban population in Morocco. Thus 301 subjects, some being treated for TB (patients) and some attending health facilities for other conditions (non-patients), in 2 Moroccan cities were surveyed. Most patients did not identify their illness as TB referring instead to a body region or symptom. Non-patients tended to cite causative factors related to living conditions, home and family. There was considerable stigma associated with TB. Most non-patients knew that TB was treatable, but few were aware that diagnosis and treatment were free. Popular understandings of TB etiology and transmission in this population differ from the biomedical view, highlighting the need for better communication about the disease.

Knowledge, attitudes and beliefs about tuberculosis in urban Morocco

We sought to characterize conceptions of tuberculosis [TB] in an urban population in Morocco. Thus 301 subjects, some being treated for TB [patients] and some attending health facilities for other conditions [non-patients], in 2 Moroccan cities were surveyed. Most patients did not identify their illness as TB referring instead to a body region or symptom. Non-patients tended to cite causative factors related to living conditions, home and family. There was considerable stigma associated with TB. Most non-patients knew that TB was treatable, but few were aware that diagnosis and treatment were free. Popular understandings of TB etiology and transmission in this population differ from the biomedical view, highlighting the need for better communication about the disease

The decline of tuberculosis epidemics under chemotherapy: a case study in Morocco.

BACKGROUND: Tuberculosis (TB) case notifications per capita fell by only 3-4% per year in Morocco between 1996 and 2005, despite implementation of the World Health Organization (WHO) DOTS strategy since the early 1990s. At the current pace of epidemic decline, there will be more than 10,000 new cases in 2050, the target year for global elimination. METHODS: Analysis of cases reported by the National TB Control Programme, disaggregated by age, sex, clinical form of TB and region, for years 1996-2005. The validity of observed patterns was judged using four criteria: statistical validity, precision of measurement, biological plausibility and the consistency and strength of different lines of evidence. RESULTS: TB incidence (case numbers and rates) is higher in urban than in rural areas and higher in adult men than in women. The most infectious (smear-positive) form of the disease is more frequent in men with TB than women. Men aged 15-44 years accounted for half of all smear-positive cases in 2005. TB incidence has fallen more slowly than average among men, but the decline was also unexpectedly slow among women. CONCLUSIONS: In Morocco, men living in cities should be a focus for prevention and control. Globally, routine surveillance data should be more fully exploited to guide TB control activities.

Results of PAL feasibility test in primary health care facilities in four regions of Bolivia.

SETTING: Primary health care (PHC) centres in four Bolivian regions. OBJECTIVES: To test the feasibility and impact of training general practitioners (GPs) in standard case management of respiratory conditions in patients aged > or =5 years. DESIGN: Comparison of the results of two surveys: the baseline survey before training and the impact survey after training on standard guidelines on case management of respiratory conditions. RESULTS: A total of 78 GPs working in 65 health centres participated in both surveys. The baseline survey registered 1033 respiratory patients and the impact survey 1154. The patients were comparable in sex distribution, previous visits, duration of symptoms and clinical diagnoses. The differences were significant in age distribution, concomitant diseases and risk factors. As a result of training, referrals to a higher level decreased by 34.6% and the proportion of tuberculosis (TB) suspects identified increased by 30%. The number of drugs prescribed per patient decreased by 16.2%. The average cost of prescription of any drug per patient dropped by 32.3%. CONCLUSION: Training in the standard practical approach to lung health guidelines improved the quality and reduced the cost of treatment of respiratory diseases at PHC units. Training should be an integral part of a comprehensive managerial approach for the implementation of case management guidelines.

Improving the quality of cohort analysis by incorporating treatment outcomes of 'transferred in' TB cases.

Treatment outcomes of patients with tuberculosis (TB) who move between TB units ('transferred out') are often not incorporated in the annual cohort analysis. Experience from Morocco shows that using a simple method, the outcomes of these patients, notified as 'transferred in' cases, can be easily taken into account when compiling the annual report on treatment outcomes. With this method the treatment success rate increased in Morocco by a median of 5.8% (range 5.0-6.7), indicating that the country reached the global target of curing at least 85% of the new smear-positive TB cases detected during the period 1995-2003.

Results of cohort analysis by category of tuberculosis retreatment cases in Morocco from 1996 to 2003.

OBJECTIVE: To analyse treatment outcomes by subcategory of tuberculosis (TB) retreatment cases. METHODS: All TB patients treated with the Category II regimen from 1996 to 2003 in Morocco were enrolled in this retrospective study. For each cohort, the retreatment outcome data were analysed as a whole and by the following sub-categories: 1) cases who relapsed after one course of anti-tuberculosis treatment; 2) cases who failed the Category I regimen; and 3) cases who interrupted one course of anti-tuberculosis treatment. RESULTS: The study population included 14 635 retreatment patients, among whom 81.7% were TB relapse cases, 5.2% had failed the Category I regimen and 13.1% were defaulters. The average treatment success rates were respectively 74.8% (range 71.8-76.6), 58.0% (range 52.4-74.0) and 51.4% (range 46.4-55.6) among relapse, failure and default cases. Failure and default rates were significantly higher (P < 0.001) among patients who failed Category I treatment and among those who defaulted, respectively. CONCLUSIONS: TB cases who fail the Category I regimen should systematically receive drug susceptibility testing, while defaulters should be given support to improve treatment adherence. Stratified cohort analysis by subcategory of retreatment has been shown to be useful for evaluating the performance of TB control programmes.