Olivia Goldin

Tuberculosis: The Potential for Cost-Effective Intervention

In 2012, an estimated 9 million people were newly diagnosed with active TB [1], and 1.5 million people died of TB [2]. Despite this, the vast majority of TB is fully curable [3].

Up until January 2012, Giving What We Can recommended the 

 as a top charity. This recommendation was withdrawn due to concerns about their capacity to use additional funds to effectively deliver cheap and effective antibiotic treatments - though this does not mean that they are not doing fantastic work.

This blog post provides a summary of our report (forthcoming), which gives an update on whether cost-effective interventions for TB still exist.

Tuberculosis (TB) is a disease caused by bacteria of the Mycobacterium Tuberculosis complex [4]. It is airborne and primarily spread by inhaling microscopic droplets through another person’s coughing or sneezing [5].

In approximately a third of the world’s population TB is latent (i.e. not yet manifesting symptoms or causing harm to the patient, and not contagious). In 2013 there were approximately 

 (i.e. harmful, symptomatic and contagious) 

 (Disability Adjusted Life Years) are lost 

: the average adult suffering from TB loses 3-4 months of work time, resulting in a loss of 20-30% of annual household income. The families of people who die from the disease lose about 15 years of income, on average. TB costs approximately 

$12 billion to the global economy annually

 or families, even once they have been cured. Women in particular may be more vulnerable given that they are less likely to earn money in developing countries and be more dependent on their husbands or male relatives. [10]

There are several factors that increase the incidence of TB. These include:

, such as prisons. TB is rendered inactive by UV light which comes from the sun, so lack of light facilitates its spreading. [11]

, which may be due to the correlation with other risk factors such as the likelihood of living in slums or being incarcerated. [12]

, as it makes the body more vulnerable to TB by weakening the immune system. [13]

Factors that increase the likelihood of death from the active stage are often of a social nature. They include a 

disbelief in the population in the benefits of TB medical treatment

 the disease, or indirectly target prevalence through 

The most cost-effective direct intervention appears to be treatment of drug-susceptible TB through short-course chemotherapy, a standard treatment regimen that forms part of the WHO's 

) strategy. In DCP2, the authors estimate that it 

 (2001 USD) to treat non-drug-resistant TB, where the patient is HIV-negative. [20]

We also recommend that charities focus direct interventions in 

areas where there is a high concentration of TB sufferers and high-risk groups

, in order to minimise extra costs, such as transportation.

There are other interventions besides direct medical treatment that may help combat TB and be cost effective. Worthy of note is that the World Bank rates the intervention of 

 [21] suggesting that there are interventions that reduce indoor air pollution that may be highly cost-effective.

Excitingly, there are several charities working in these areas that appear to be highly cost-effective. Although exact figures are not currently available, 

 appears to be averting DALYs at a cost of less than $50 per DALY. A calculation of this figure, along with discussion of other promising organisations, is included in the report, but it is important to note that our analysis of these organisations is very preliminary and so this estimate may be subject to substantial revision as we learn more about Target TB.

 as promising initiatives working to alleviate the risk factor of indoor air pollution.

Much more research is needed in this area. However, some TB interventions appear very promising, and we look forward to seeing further exploration of these.

US Center for Disease Control: Education Resources on TB

US Center for Disease Control: fact sheet on TB

Governmental report on TB control in India in 2011

Perception and social consequences of tuberculosis: a focus group study of tuberculosis patients in Sialkot, Pakistan

WHO and UN: Policy guidelines for collaborative TB and HIV services for injecting and other drug users

Linking TB and the environment: an overlooked mitigation strategy

Stop TB Partnership: World TB day brochure

Friends for International Tuberculosis Relief: Treatment Default

World Bank: indoor air pollution at a glance

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Tuberculosis: The Potential for Cost-Effective Intervention