Dermot Maher

International Standards for Tuberculosis Care

Part of the reason for failing to bring about a more rapid reduction in tuberculosis incidence worldwide is the lack of effective involvement of all practitioners-public and private-in the provision of high quality tuberculosis care. While health-care providers who are part of national tuberculosis programmes have been trained and are expected to have adopted proper diagnosis, treatment, and public-health practices, the same is not likely to be true for non-programme providers. Studies of the performance of the private sector conducted in several different parts of the world suggest that poor quality care is common. The basic principles of care for people with, or suspected of having, tuberculosis are the same worldwide: a diagnosis should be established promptly; standardised treatment regimens should be used with appropriate treatment support and supervision; response to treatment should be monitored; and essential public-health responsibilities must be carried out. Prompt and accurate diagnosis, and effective treatment are essential for good patient care and tuberculosis control. All providers who undertake evaluation and treatment of patients with tuberculosis must recognise that not only are they delivering care to an individual, but they are also assuming an important public-health function. The International Standards for Tuberculosis Care (ISTC) describe a widely endorsed level of care that all practitioners should seek to achieve in managing individuals who have, or are suspected of having, tuberculosis. The document is intended to engage all care providers in delivering high quality care for patients of all ages, including those with smear-positive, smear-negative, and extra-pulmonary tuberculosis, tuberculosis caused by drug-resistant Mycobacterium tuberculosis complex, and tuberculosis combined with HIV infection.

The HIV-associated tuberculosis epidemic-when will we act?

Despite policies, strategies, and guidelines, the epidemic of HIV-associated tuberculosis continues to rage, particularly in southern Africa. We focus our attention on the regions with the greatest burden of disease, especially sub-Saharan Africa, and concentrate on prevention of tuberculosis in people with HIV infection, a challenge that has been greatly neglected. We argue for a much more aggressive approach to early diagnosis and treatment of HIV infection in affected communities, and propose urgent assessment of frequent testing for HIV and early start of antiretroviral treatment (ART). This approach should result in short-term and long-term declines in tuberculosis incidence through individual immune reconstitution and reduced HIV transmission. Implementation of the 3Is policy (intensified tuberculosis case finding, infection control, and isoniazid preventive therapy) for prevention of HIV-associated tuberculosis, combined with earlier start of ART, will reduce the burden of tuberculosis in people with HIV infection and provide a safe clinical environment for delivery of ART. Some progress is being made in provision of HIV care to HIV-infected patients with tuberculosis, but too few receive co-trimoxazole prophylaxis and ART. We make practical recommendations about how to improve this situation. Early HIV diagnosis and treatment, the 3Is, and a comprehensive package of HIV care, in association with directly observed therapy, short-course (DOTS) for tuberculosis, form the basis of prevention and control of HIV-associated tuberculosis. This call to action recommends that both HIV and tuberculosis programmes exhort implementation of strategies that are known to be effective, and test innovative strategies that could work. The continuing HIV-associated tuberculosis epidemic needs bold but responsible action, without which the future will simply mirror the past.

Evaluation of Respondent-driven Sampling

Background: Respondent-driven sampling is a novel variant of link-tracing sampling for estimating the characteristics of hard-to-reach groups, such as HIV prevalence in sex workers. Despite its use by leading health organizations, the performance of this method in realistic situations is still largely unknown. We evaluated respondent-driven sampling by comparing estimates from a respondent-driven sampling survey with total population data. Methods: Total population data on age, tribe, religion, socioeconomic status, sexual activity, and HIV status were available on a population of 2402 male household heads from an open cohort in rural Uganda. A respondent-driven sampling (RDS) survey was carried out in this population, using current methods of sampling (RDS sample) and statistical inference (RDS estimates). Analyses were carried out for the full RDS sample and then repeated for the first 250 recruits (small sample). Results: We recruited 927 household heads. Full and small RDS samples were largely representative of the total population, but both samples underrepresented men who were younger, of higher socioeconomic status, and with unknown sexual activity and HIV status. Respondent-driven sampling statistical inference methods failed to reduce these biases. Only 31%–37% (depending on method and sample size) of RDS estimates were closer to the true population proportions than the RDS sample proportions. Only 50%–74% of respondent-driven sampling bootstrap 95% confidence intervals included the population proportion. Conclusions: Respondent-driven sampling produced a generally representative sample of this well-connected nonhidden population. However, current respondent-driven sampling inference methods failed to reduce bias when it occurred. Whether the data required to remove bias and measure precision can be collected in a respondent-driven sampling survey is unresolved. Respondent-driven sampling should be regarded as a (potentially superior) form of convenience sampling method, and caution is required when interpreting findings based on the sampling method.

Promoting protection and pleasure: amplifying the effectiveness of barriers against sexually transmitted infections and pregnancy

The global burden of morbidity and mortality associated with sexually transmitted infection (STI) and unwanted pregnancy is a prominent global public-health issue. For example HIV/AIDS and other STI cause 12.9% of the burden of disease in disability-adjusted life years. Unsafe sex is the second highest cause of the global burden of disease. Therefore an urgent need exists to amplify effective use of evidence-based measures to diminish this burden including barrier methods that protect against both STI and pregnancy (male and female condoms). The limited effect so far of public-health campaigns to promote effective use of these barrier methods might be attributable in part to scare tactics that emphasise adverse consequences of sexual acts. Promotion of pleasure in use of male and female condoms--alongside safer sex messages--can facilitate consistent use of condoms and boost their effectiveness to protect against STI and pregnancy. Therefore the effect of public-health initiatives that emphasise positive outcomes of use of male and female condoms as barrier methods and positive results of practising other forms of safer sex need to be investigated. Such work includes the potential for safer sex to contribute to good health and hygiene in general (and a healthy sex life in particular) to reduce anxiety about risk of STI and pregnancy and quite simply to make sex more pleasurable. In this Viewpoint we discuss the potential for increasing condom uptake and safer sexual behaviours by promoting pleasurable aspects of condom use in public-health campaigns. (excerpt)

Scale up: meeting targets in global tuberculosis control

Despite great progress, global targets for tuberculosis case detection and cure might not be reached by 2005. In particular, there is a serious case-detection gap between estimated annual incident cases and those reported under the strategy for tuberculosis control branded as DOTS. Delays in reaching targets result in lack of effect on incidence of disease, which is of particular concern in regions where incidence is increasing-eg, sub-Saharan Africa and the former Soviet Union. Four key actions will speed up progress towards reaching global targets: 1) equipping national tuberculosis programmes to have a stewardship role in engaging all health providers in implementing the DOTS strategy; 2) establishing the feasibility of national certification systems of DOTS coverage; 3) promoting community action to contribute to patient care and to voice demand for the DOTS strategy; and 4) increasing support to sub-Saharan Africa for implementation of a strategy of expanded scope to counter HIV-1-fuelled tuberculosis.

Tuberculosis in prisons in countries with high prevalence

On any day worldwide about 10 million people are incarcerated, in prisons, remand centres, police stations, jails, detention centres for asylum seekers, penal colonies, and prisoner of war camps. There is an increasing recognition that the high risk of tuberculosis in these settings poses a problem for those imprisoned and for the wider society. The issue now is what to do about what was until very recently “a forgotten plague.”1 The important general measures for tuberculosis control in prisons are improvement of prison conditions, particularly a reduction in overcrowding, improvement of nutrition and hygiene, and guaranteed access to improved prison health services. Knowledge of the epidemiology of tuberculosis in prisons, appreciation of what makes control different from control in other settings, and understanding of the principles of tuberculosis control are all necessary for governmental and other agencies to contribute to the implementation of effective tuberculosis control programmes in prisons. We have focused here on countries with a high prevalence of tuberculosis, where the problem is most severe and the need for action most pressing, and on the specific measures necessary in the implementation of an effective prison tuberculosis programme. #### Summary points People incarcerated are at high risk for tuberculosis and case rates are among the highest ever recorded in any population The specific features of prisons and of prisoners necessitate specific approaches to tuberculosis control that are different from those used in the general population Guarantees are needed to ensure completion of treatment; and this requires political and administrative commitment Prisons can also provide an opportunity for effective tuberculosis control, which may well lead to improved prison health care The article is based on information from ongoing clinical work, follow up of ongoing prison programmes, and reports from prisons, supplemented by literature searches. Prisons are closed institutions for prisoners during their …

Treatment outcome of an unselected cohort of tuberculosis patients in relation to human immunodeficiency virus serostatus in Zomba hospital, Malawi

There is little information about treatment outcome in patients with smear-negative pulmonary tuberculosis (PTB) or extrapulmonary tuberculosis (EPTB) treated under routine programme conditions in subsaharan Africa. A prospective study was carried out to determine treatment outcome in an unselected cohort of TB patients admitted to Zomba General Hospital, Malawi. Eight hundred and twenty-seven adult TB patients (451 men and 376 women) were registered between 1 July and 31 December 1995. Standardized treatment outcomes of treatment completion, death, default, and transfer to another district were assessed in relation to type of TB, human immunodeficiency virus (HIV) serostatus, age and gender. Two hundred and fifty-four patients (31%) died by the end of treatment, half of the deaths occurring in the first month. Death rates were 19% among 386 patients with smear-positive PTB, 46% among 211 patients with smear-negative PTB, and 37% among 230 patients with EPTB; 77% of the patients were HIV seropositive. Among new patients, HIV-positive patients had higher death rates than HIV-negative patients (hazard ratio [HR] 2.5; 95% confidence interval [95% CI] 1.6-3.8). Smear-negative patients had the highest death rates (HR 3.9; 95% CI 2.7-5.5 compared to smear-positive patients), followed by EPTB patients (HR 2.6, 95% CI 1.8-3.7 compared to smear-positive patients). Death rates increased with age but were similar in men and women. Adult patients in Malawi with smear-negative PTB and EPTB have low treatment completion and high death rates, related to high levels of HIV infection. National TB control programmes in areas of high HIV prevalence should no longer ignore treatment outcomes in patients with smear-negative PTB or EPTB.

Distribution of hyperglycaemia and related cardiovascular disease risk factors in low-income countries: a cross-sectional population-based survey in rural Uganda

Background Data on non-communicable disease (NCD) burden are often limited in developing countries in Africa but crucial for planning and implementation of prevention and control strategies. We assessed the prevalence of related cardiovascular disease risk factors (hyperglycaemia, high blood pressure and obesity) in a longstanding population cohort in rural Uganda. Methods Trained field staff conducted a cross-sectional population-based survey of cardiovascular disease risk indicators using a questionnaire and simple measurements of body mass index (BMI), waist and hip circumference, waist/hip ratio (WHR), blood pressure and random plasma glucose. All members of the population cohort aged ≥13 years were eligible to participate in the survey. Results Of the 4801 males and 5372 females who were eligible, 2719 (56.6%) males and 3959 (73.7%) females participated in the survey. Male and female participants had a mean standard deviation (SD) age of 31.8 (18.4) years and 33.7 (17.6) years, respectively. The observed prevalences of probable diabetes (glucose >11.0 mmol/l) and probable hyperglycaemia (7.0–11.0 mmol/l) were 0.4 and 2.9%, respectively. Less than 1% of males and 4% of females were obese (BMI ≥30 kg/m2), with 3.6% of males and 14.5% of females being overweight (BMI 25.0–29.9 kg/m2). However, in women, the prevalence of abdominal obesity was high (71.3% as measured by WHR and 31.2% as measured by waist circumference). The proportions of male and female current regular smokers were low (13.7 and 0.9%, respectively). The commonest cardiovascular disease risk factor was high blood pressure, with an observed prevalence of 22.5% in both sexes. Conclusions Population-based data on the burden of related cardiovascular disease risk factors can aid in the planning and implementation of an effective response to the double burden of communicable diseases and NCDs in this rural population of a low-income country undergoing epidemiological transition.

Tuberculosis and HIV interaction in sub‐Saharan Africa: impact on patients and programmes; implications for policies

Sub‐Saharan Africa carries the overwhelming share of the global burden of human immunodeficiency virus (HIV)/acquired immunodeficiency syndrome (AIDS) and of HIV‐associated tuberculosis (TB). The impact of HIV on TB patients and programmes has implications for TB control policies. The impact on patients includes the effect of HIV on diagnosis and on the patterns of HIV‐related TB, the response of HIV‐infected TB patients to TB treatment, the benefits of antiretroviral therapy (ART), and the quality and continuity of care for TB patients. The impact on national TB programmes (NTPs) includes increased case load, impaired NTP performance, increased need for access to ART and difficulties in reaching TB control targets. Implications for policies include the need to promote TB and HIV/AIDS programme collaboration, aimed at improving NTP performance (TB case‐finding and treatment outcomes), quality and continuity of care, and monitoring and interpretation of progress towards TB control targets. In order to provide the recommended international standard of care for TB patients, clinicians need to be aware of the impact of HIV on TB patients and programmes and the implications for the policies that provide the framework for this standard. Conversely, policy‐makers need to understand the impact of HIV on TB patients and programmes. This can help to ensure a firm evidence base for TB control policies aiming at the high standard of patient care that is at the heart of TB and HIV programmes.

Tuberculosis in a prison population in Malawi

BACKGROUND Much concern has been expressed about the high prevalence of tuberculosis in prisons in industrialised countries. Since there is almost no information from developing countries, we investigated the rate of pulmonary tuberculosis in a large prison in Malawi. METHODS Between May and July, 1996; we carried out an active case-finding survey in Zomba Central Prison, Malawi, through the National Tuberculosis Control Programme. We interviewed prisoners, and those with a cough of at least 1 weeks duration were screened by sputum-smear microscopy. If microscopy was negative, prisoners underwent chest radiography. We offered HIV testing, with voluntary consent and counselling before and after tests, to all prisoners, whether positive or negative for pulmonary tuberculosis. FINDINGS 914 (70%) of 1315 prisoners were screened (905 men, nine women; mean age 30 years [SD 11]). 47 (5%) screened prisoners (all men) had pulmonary tuberculosis: 14 were taking antituberculosis treatment and 33 were undiagnosed at the start of the study; 18 were sputum-smear positive and 15 were sputum-smear negative. 16 (73%) of 22 prisoners with previously undiagnosed pulmonary tuberculosis and 30 (75%) of 40 prisoners with cough but no evidence of pulmonary tuberculosis were HIV seropositive. In all prisoners, except one, symptoms of pulmonary tuberculosis had developed after they had entered prison. INTERPRETATION We found a high rate of pulmonary tuberculosis in Zomba Central Prison, which suggests active transmission of tuberculosis. As a result of this study, the National Tuberculosis Control Programme has implemented interventions in eight prisons in Malawi to improve tuberculosis control, including collection of health data, education of prisoners and clinical staff about tuberculosis, active screening of prisoners for pulmonary tuberculosis by sputum-smear microscopy, and active case-finding in the prisons.