CSU 11/2011: NTD IMPLEMENTATION THROUGH PREVENTIVE CHEMOTHERAPY

Thursday, 6th of January 2011

Integrated Implementation of Programs Targeting Neglected Tropical Diseases through Preventive Chemotherapy: Proving the Feasibility at National Scale

Mary Linehan, Christy Hanson, Angela Weaver, Margaret Baker, Achille Kabore, Kathryn L. Zoerhoff^*, Dieudonne Sankara, Scott Torres, AND Eric A. Ottesen
RTI International, Washington, District of Columbia; United States Agency for International Development, Washington, District of Columbia; Department of International Health, School of Nursing and Health Sciences, Georgetown University, Washington, District of Columbia; Liverpool Associates in Tropical Health, Washington, District of Columbia

 
Abstract.: In 2006, the United States Agency for International Development established the Neglected Tropical Disease (NTD) Control Program to facilitate integration of national programs targeting elimination or control of lymphatic filariasis, onchocerciasis, schistosomiasis, soil-transmitted helminthiasis and blinding trachoma. By the end of year 3, 12 countries were supported by this program that focused first on disease mapping where needed, and then on initiating or expanding disease-specific programs in a coordinated/integrated fashion. The number of persons reached each year increased progressively, with a cumulative total during the first three years of 98 million persons receiving 222 million treatments with donated drugs valued at more than $1.4 billion. Geographic coverage increased substantially for all these infections, and the program has supported training of more than 220,000 persons to implement the programs. This current experience of the NTD Control Program demonstrates clearly that an integrated approach to control or eliminate these five neglected diseases can be effective at full national scale.

 
The neglected tropical diseases (NTDs) are a group of conditions causing significant morbidity and mortality worldwide but which until recently received only minimal attention from most of the world, largely because they affect the poorest, most vulnerable and most disenfranchised members of society.¹ Afflicting more than one billion persons, one-sixth of the world's population, these diseases cause severe disfigurement, disability, and blindness. The NTDs are among the leading perpetuators of poverty because they significantly diminish economic productivity in affected adults and because they impair the intellectual and physical development of the next generation in disease-endemic areas, setting already vulnerable children on a path to lifelong disability that reinforces a cycle of poverty.¹

Among the 15 most prominent NTDs,² seven have similar strategies to address their control; namely, single doses of effective treatment, termed preventive chemotherapy (PCT), given once or twice a year to broad segments of the population in disease-endemic areas through mass drug administration (MDA). These seven diseases are lymphatic filariasis (LF), onchocerciasis, schistosomisis, trachoma, and three soil-transmitted helminth (STH) infections (ascariasis, hookworm, and trichuriasis).³ The treatment and diagnostic tools currently available for this group of diseases are sufficiently effective for these NTDs to be targeted either for elimination or for reduction to such low levels that they no longer constitute a significant public health problem.

Most of the drugs used in these single-dose, once- or twice a year treatment regimens are donated through large public-private partnerships that bring together public health implementers, public-sector and private-sector donors, and the major pharmaceutical firms producing these drugs (GlaxoSmithKline, Johnson & Johnson, Merck and Co., Inc., Merck-Serono, and Pfizer).⁴

Historically, many Ministries of Health in disease-endemic countries have supported the control of NTDs through independent, often parallel, programs, with each maintaining its own planning, funding, drug supply chain, MDA campaign, monitoring, and evaluation. If funding were available for one program, that program might have been able to implement preventive chemotherapy while a sister program could not. However, because there is considerable overlap of these diseases in persons and communities, controlling one of the NTDs and not others that could be managed through a similar strategy is inefficient at best. Furthermore, research has provided sufficient evidence to suggest that co-implementation of the integrated PCT programs is safe for persons and communities in all but a few specific settings (e.g., Loa loa co-endemicity with onchocerciasis or LF).³

Because of the similarity of their strategic approaches, the epidemiologic overlap among affected populations and the availability of donated drugs, these NTD control programs seemed ideally suited for implementation that could be carried out not in parallel, independent fashion, but, rather integrated in a way where coordinated treatment interventions for multiple diseases could reduce the duplication of effort expended in treating the diseases separately. Such integration, here considered in the broadest sense as coordination of program activities among different disease-specific programs and as linkages of these activities with other elements of the health care system, should lead to efficiencies of delivery, enhanced effectiveness, increased health benefits, and better use of limited resources that could permit more at-risk persons to be reached.⁵ The World Health Organization (WHO) has endorsed such co-implementation of programs as the integrated approach to preventive chemotherapy.

Early pilot studies of NTD program integration generally showed that despite many practical challenges, such integration was likely to be feasible and to result in at least some of the anticipated efficiencies and cost savings.⁶–⁸ Although it was clear from these pilot studies that certain elements of program implementation were more amenable to successful integration than others, it was not clear either how successful the scaling up of these integration efforts from pilot studies to national-scale programs could be or just which combinations of activities were most effectively linked.

The opportunity to document the feasibility of integrated approaches to NTD control at full national-scale presented itself when the U.S. Congress in 2006 authorized funds for "the integrated control of neglected tropical diseases."⁹ This authorization led to the establishment of NTD Control Program of the United States Agency for International Development (USAID) that envisioned, over a five-year period, facilitating integrated NTD programs in 15 countries. The present report documents the considerable achievements of the first three years of this NTD Control Program towards the development and growth of national integrated NTD programs and in their expansion to full national scale.

 
The NTD Control Program. Goals and approach. The USAID NTD Control Program initiated activities in September 2006. Its defined target was to enable the provision of 160 million preventive chemotherapy treatments to 40 million people in 15 countries through integrated NTD programs over five years. The stated aims of the program have been 1) to support and empower national governments to develop integrated NTD control programs embedded, where possible, within existing service delivery platforms and to lead these programs in scaling-up activities to full national levels; 2) to provide technical assistance for planning, budgeting, reporting, and complying with international standards and guidelines (Table 1) to improve program integration; 3) to promote cost-efficiency, improved integration strategies, and effective advocacy; and 4) to assure national ownership, continued commitment, and resource mobilization for sustained support for NTD control.

 
The prime contractor, RTI International, has provided grants and coordination for a team of non-governmental organizations (NGOs) and implementing partners to support integrated NTD control programs organized and led by the governments of selected countries. The support from the U.S. Government was intended to build on existing commitments by governments and other donors and fill financial and technical gaps that were preventing national programs from reaching full national scale. The program was mandated to track and report on the additional numbers of persons reached and treatments provided through support of the NTD Control Program (recognizing that in some countries other support also exists for NTD control).

Participating countries and NGOs. The countries currently involved in the USAID-supported, RTI-coordinated NTD Control Program are identified in Table 2, along with the lead NGO responsible in each country for interfacing between the national Ministry of Health and RTI. Those five countries that had earlier pilot programs, initiated with support from the Bill and Melinda Gates Foundation¹⁰ and aimed at integrating disease-specific NTD control activities, are referred to as the fast-track countries because they could begin scaling up activities immediately; additional countries have been brought into the program progressively. By the end of year 3, 12 countries were included in the program, of which 7 were actively engaged in yearly MDAs. It is from these first seven implementing countries that the quantitative measures of the NTD Control Program's programmatic achievement during its first 3 years (reported below) are derived.

 
Drug distribution. All drugs were distributed by the national Ministries of Health whose national NTD control programs determined how best to implement their MDAs (Table 2). The drugs were used according to WHO recommendations (Table 1). When disease co-endemicity required the use of multiple drugs (including combinations of albendazole, diethylcarbamazine [DEC], ivermectin, mebendazole or praziquantel), these were generally given at the same time, although sometimes the praziquantel treatment was delayed for at least a week after the other drugs were administered. When azithromycin was required, its administration was always at least a week separated from those of the other drugs, as currently recommended.

Albendazole for treatment of LF was donated by GlaxoSmithKline¹¹; when used to treat STH in areas where LF is not endemic, albendazole was obtained from pre-qualified generic manufacturers. Azithromycin (Zithromax) was donated by Pfizer.¹² Diethylcarbamazine was obtained through WHO from pre-qualified generic manufacturers. Ivermectin (Mectizan) was donated by Merck & Co., Inc.¹³ Mebendazole was donated by Johnson & Johnson⁴ to treat persons with STH in countries where its Children Without Worms program operates. Tetracycline eye ointment was obtained from pre-qualified generic manufacturers.

Technical assessments. Mapping. Because knowledge of the distribution of each NTD in a country is absolutely essential for developing any implementation (or integrated-implementation) plan, disease-specific mapping was carried out according to guidelines recommended by WHO and its partners (Table 3). Although some of these guidelines are still evolving, for all program assessments, the most up-to-date recommendations were followed.

 
Program metrics. To document progress toward achieving the program's targets of 40 million additional persons treated with 160 million treatments over 5 years, the following indicators were used to track country-specific program progress: 1) number of countries supported by the NTD Control Program; 2) number of additional districts (implementation units) mapped for each endemic disease; 3) number of people treated (i.e., receiving at least one drug or drug package) and recorded in MDA registers for each round of PCT; 4) number of additional (i.e., made possible through support from the NTD Control Program) treatments provided (i.e. number of times a single drug dose is administered) and recorded in MDA registers for each round of PCT; 5) number of additional implementation units reached and reported by national programs for each round of PCT; 6) programmatic coverage: % targeted population reached with appropriate PCT treatment each round of PCT and calculated from register reports as the number treated divided by treatment-eligible population targeted in the implementation unit (as defined by census reports); 7) geographic coverage: % of endemic districts covered by PCT programs; and 8) number of persons trained for integrated NTD control through support from the NTD Control Program.

Program expenditures. Funding levels for each of the program's first three years approximated $13.5 million per year, with the mandate that at least 80% of total annual resources be allocated to country program implementation and that overall management costs by RTI (whose role was to ensure financial accountability of all funds expended and to provide requested technical assistance to national programs) be no more than 20%. Of the 80% allocated for country implementation activities, approximately 20% was earmarked for procurement of essential drugs not available through donation programs (i.e., PZQ for schistosomiasis, DEC for LF, and albendazole for childhood de-worming in areas where LF is not co-endemic).

 
Mapping the geographic distribution of the targeted NTDs. Because knowing the distribution of the targeted NTDs is essential for developing an implementation strategy, the first efforts of the NTD Control Program in the participating countries focused on cataloging the disease-distribution information available and then supporting on-the-ground efforts to map the distribution of infection where sufficient information was not available.

Table 4 aggregates the data from all of the districts in the first seven implementing countries (identified in Table 2) and indicates the total number of districts that had been mapped for each of the NTDs prior to the initiation of the NTD Control Program. It is clear that mapping was already well advanced for LF. For the other diseases, there was still a great need for additional information on the distribution of these infections.

 
Table 4 also shows the progress made by the end of the first three years of support to the participating countries through the NTD Control Program. For each of the targeted diseases, mapping activities progressively defined the extent of the targeted diseases, and as a result of these efforts and those of other partners, only a small number of districts in these countries remained to be mapped for these NTDs at the end of year 3 (now targeted for subsequent years' activities).

Persons treated and number of treatments delivered in years 1–3. Although programs targeting the individual NTDs were active in many countries prior to the inception of the NTD Control Program, few countries approached these diseases with an integrated control strategy. As seen in Figure 1A, after the fast track countries, with earlier support for pilot-scale integration studies by the Bill and Melinda Gates Foundation,¹⁰ began to receive support for integrated programs from the NTD Control Program, there was a progressive increase in numbers of persons reached each year, beginning with 16 million additional individuals in the first year and reaching 27 and 55 million additional persons in each of the second and third years. (These numbers identify only those persons whose treatment was made possible by support to national programs from the NTD Control Program, cumulatively more than 98 million persons over three years.)

 
Because a treated person in these integrated programs often receives a drug package comprising more than one medication, the metric ‘treatments provided' was developed to record the number of individual drug treatments received by the target population. As indicated in Figure 1B, 222 million drug treatments were provided during the first three years of support to the 7 implementing countries by the NTD Control Program. The details of these treatments provided (drugs treatments distributed by the seven participating national programs) are shown in Table 5.

 
Quantity/value of drugs delivered. As the national programs supported by NTD Control Program funds increased in number and expanded in scope, the number of donated tablets of drug delivered to the national NTD programs has also increased. Table 6 shows that in year 3 alone more than 300 million drug tablets were donated and delivered to the countries receiving NTD Control Program support. The value of these drugs (as defined by each specific donation program) exceeded $575 million dollars in year 3 and has totaled more than $1.4 billion dollars in the program's first three years.

 
Coverage. The sine qua non for success of preventive chemotherapy programs is high rates of drug coverage in the disease-endemic populations. Although varying among countries and for specific programs within each country, programmatic coverage (the percentage of targeted persons who actually received the drug) was generally good (Table 7). These values were based on numbers reported by the drug distributors and their supervisors; and when these reported values were subjected to validation studies in coverage surveys, there was generally good agreement between the reported and surveyed coverage values (data not shown).

 
For successful elimination and large-scale control programs using the preventive chemotherapy strategy, it is also necessary to have broad geographic coverage (the percentage of disease-endemic districts covered by PCT programs). Figure 2 records the numbers of districts under treatment of each disease during the first 3 years. It shows that for each of the NTDs, the geographic coverage increased progressively during the three years of NTD Control Program activity. Because the program can only expand (i.e., increase geographic coverage) in areas where mapping is complete, those NTDs where mapping is more advanced (e.g., onchocerciasis where the African Program for Onchocerciasis Control has been a strong and consistent source of funding for mapping and implementation) have the greatest geographic coverage. By the end of year 3, geographic coverage in the 7 implementing countries had increased for each of the NTDs, ranging from a high of 95% for onchocerciasis to a low of 50% for schistosomiasis. The treatment gap remaining for each disease in the first seven countries and targeted in the upcoming years can be appreciated in Figure 2.

 
Training/national capacity building. At the heart of all PCT programs is the community that is affected by NTDs. Training is designed to empower these communities to treat NTDs within their own populations. The NTD Control Program has supported the training of more than 220,000 persons during its first three years, with most being community-based health workers/drug distributors (Figure 3). Working at levels from the central ministries to the communities, a cascade of training has been facilitated to support social mobilization, community outreach, supply chain organization and management, and technical implementation of PCT. The fundamental content of training courses and refresher training is similar for most programs, but local needs dictate local training and organizational strategies.

 
NTD Control Program expenditures. Analysis of expenditures during the first three years shows that the program fulfilled its mandate that at least 80% of program funds be spent on country program implementation. During the first three years, the program received $40,728,320 in funding. Program expenditures by the end of year 3 were $37.9 ($2.8 million remaining to be spent), with 81.3% expended for country program activities and purchase of essential drugs and with 18.7% used for overall management of the program (its grants, monitoring and evaluation, reporting, documentation of best practices, technical and representational meetings, and advocacy activities).

The breakdown of program expenditures reflects the diverse set of activities that must be supported to enable treatment of persons at the community level. Of the 81.3% of funds going directly for country program activities and supplies (Figure 4), the largest portion (28%) was spent on the MDAs themselves, including for social mobilization, drug distribution, and personnel supervision. Almost equal portions (19–22%) went to drug procurement, capacity building, and country-led management and program monitoring. The remaining 11% was required for the initial mapping to define disease distribution.

 
Although not yet specifically documented for this program, it should be noted that previous costing studies of programs to control one or more NTDs have shown that in addition to the external support received by disease-endemic countries, the national ministries contribute approximately an equal level of resources in staff salaries and in-kind resources to achieve success.¹⁴

 
The whole concept of program integration is, undeniably, complex and involves, as described by some,¹⁵ not only the multiple domains of policy, activity, and organizational structure, but also multiple levels of integration intensity: coordination, collaboration, and consolidation. To others, however, integration is more an attitude than a formula, a focus on trying always to find ways to carry out multiple activities with the most efficient and cost-effective use of available resources. From either perspective, the arguments for integrating control programs that target the NTDs remain strong: the populations affected are much the same, the strategic approach (preventive chemotherapy) is essentially identical, and the drugs for implementing programs are largely donated, readily available, highly safe, and effective. Furthermore, opportunities to embed or integrate NTD control activities within school-health programs and through other platforms of health service delivery offer the promise of greater efficiency, long-term sustainability, and national capacity strengthening.

Early pilot studies confirmed the general feasibility of successful integration of NTD control efforts,⁶–⁸ but two major questions have remained. 1) Can the integrated NTD control activities effective in pilot studies be successfully expanded to programs at full national scale? 2) Which elements of individual NTD programs are most successfully integrated and how are they best implemented? The findings in this present report address the first question, showing clearly that integration of multiple disease-specific NTD control programs can be successfully implemented at full national scale. Assessment and analyses addressing the second question, to define the most effective and cost efficient ways of integrating specific program activities, are still underway.

From the data in Figure 1, it is clear that funds from the USAID support of the NTD Control Program have been effective in facilitating national programs to support, organize, implement, and monitor integrated, formerly disease-specific programs targeting WHO's five tool-ready NTDs.³ In the 7 study countries receiving support during the program's first three years, progressive scaling up resulted in an additional 16 million persons receiving appropriate PCT in the first year, 27 million in the second year, and 55 million in the third year, for a cumulative total of more than 98 million persons reached in three years and quite clearly proving the feasibility for integrated NTD programs to be carried out at full national scale.

Introduction of this funding also effected a major qualitative change in national programs targeting the NTDs. Even though in the year prior to the NTD Control Program, up to 33 million people had received treatment of NTDs in disease-specific programs in the target countries, these national programs were constantly challenged to identify funds, most often on a yearly basis, to support their program activities. With the NTD Control Program, a secure funding source was established, so that these national programs not only could achieve broader disease control in their populations but also could undertake proper planning to address their NTD problems more effectively and cost efficiently.

Different from single-disease programs where each person reached equals one treatment given, in the integrated programs each person reached receives a drug ‘package' usually containing more than one drug. Therefore, the metric ‘treatments delivered,' the number of times a single drug dose is administered, had to be developed to record this programmatic achievement. More than 222 million treatments were provided by national programs during the first three years of the NTD Control Program. It can be predicted with certainty, based on recent studies assessing the impact of disease-specific NTD programs,¹⁶,¹⁷ that when the program assesses the health benefits from these treatments after 3–5 years of treatment, its impact on personal, societal, and economic well-being will be seen to be enormous.

What even these numbers by themselves fail to impart, however, is an understanding of the magnitude and importance of the public-private partnership between specific pharmaceutical companies and the public sector. It has been the donation of extraordinary amounts of drugs (by GlaxoSmithKline, Johnson & Johnson, Merck & Co., Inc., and Pfizer) that has made possible the successes of these global efforts to control or eliminate the NTDs. In addition, although the drug manufacturers have without question provided most of the drugs used in this program, the generic drugs needed for schistosomiasis and STH control and for LF elimination in countries outside Africa have also been obtained and provided to national programs in the NTD Control Program by a number of governmental and nongovernmental partner organizations, including the Department for International Development (United Kingdom), the United Nations Children's Fund, University of Notre Dame, WHO, the World Food Program, and World Vision.

In addition to its role in facilitating integrated national MDA programs to provide treatments for their at-risk populations, the NTD Control Program has, of necessity, supported countries in mapping the distribution of infection and developing, in collaboration with WHO, action plans that will enable them to begin or expand implementation of drug delivery in the coming years. Already the empirical experience gained from three years of program activities in the first seven implementing countries has contributed appreciably to the development of new guidelines, norms, and regionalized strategies that will facilitate and accelerate program activities in the many countries still needing to begin their integrated NTD control programs.

Major challenges still lie ahead for creating integrated programs targeting NTD control or elimination, not the least of which is the large number of countries requiring these programs. Such a need provides political challenges not just for the national governments, which must commit their limited resources and energy to the programs, but also for the bilateral donors to support these national commitments, the drug manufacturers to sustain their long-term pledges, and the various implementing partners necessary to support national programs to carry out their integrated NTD implementation strategies.

In addition to these political challenges, technical challenges also remain, the first being definition of the geographic scope of each of the NTDs. Mapping the infections must be completed, not just to identify prevalence, but, even more importantly, to define exactly what action must be taken at which level of prevalence and in which geographic area for each of the NTDs. Then, once it is determined what action is required for each of the NTDs, the treatment gaps for specific diseases (e.g., schistosomiasis [Figure 2]) must be addressed and the efficiencies of integration (in terms of both cost and impact) identified and quantified so that cost-efficient integrated programs can be established. It does, of course, remain absolutely essential that the specific goals of each individual program being integrated be met, including those program targets that are not MDA-dependent, such as morbidity control (surgical and otherwise) for LF and trachoma, and the water and sanitation goals of the schistosomiasis, STH, and trachoma programs. Sacrificing a program's goals simply for the sake of integration is totally inappropriate. Thus, the elimination targets for LF and blinding trachoma by 2020¹¹,¹² must be kept, and for onchocerciasis in the Americas and selected foci in Africa, the elimination targets must also be respected.¹⁸,¹⁹

In just three years, the NTD Control Program has exceeded program expectations that had been based on previous pilot program activities. This achievement demonstrates not only the feasibility of going to national scale with an integrated approach but also that efficiencies can be achieved through integration. These efficiencies come, in large part, from removing duplication in the operations of specialized disease programs as co-implementation is introduced. They also stem from the ability of the NTD programs to implement PCT through community networks, schools and existing health service delivery platforms, such as child health days. Going forward, even greater gains may accrue as opportunities are pursued strategically to leverage or complement other development-sector efforts, such as water and sanitation improvements, or other health-sector inputs, such as malaria control activities. This type of integration of NTD control within development efforts and on existing health-service delivery platforms holds promise for even greater program efficiency and its positive impact on strengthening national health systems. Although it is clear that not all integrated NTD program activities will have such health system strengthening effects,²⁰ it is also clear that many of these integrated program activities can very definitely build stronger systems for delivering healthcare and disease prevention to these most underserved populations in NTD-endemic countries.²¹

Although the creation of integrated NTD control programs has brought with it a wide range of political and technical challenges whose importance should not be underestimated,²⁰ there can be little question but that today's increased attentiveness and support for NTD control provide important opportunities to advance the health of the world's neediest populations towards global health equity in ways never before possible. This current experience of the USAID NTD Control Program has proven already that an integrated approach to these diseases is feasible at full national scale. What still remains now is to draw further on the experiences of this young program to define those elements of disease-specific program integration that can yield the greatest benefits cost-effectively and cost-efficiently. There appears to be no reason why such integrated NTD programs, following general WHO guidelines and the accumulating experience of a growing number of countries, cannot be replicated in all places where they are needed, so long as necessary political commitment and support can be maintained.

Disclaimer: This study is made possible by the generous support of the American people through the United States Agency for International Development (USAID). The contents are the responsibility of the authors and do not necessarily reflect the views of USAID or the United States Government.

Received July 19, 2010. Accepted for publication October 7, 2010.

 
We thank the Ministries of Health of the participating countries for their absolutely essential programmatic contributions to the success of the first three years of the NTD Control Program; Abdel Direny, Amadou Garba, John Marfoh, Ambrose Onapa, Mustapha Sonnie, Soumana Thienta, Seydou Toure, Fiona Fleming, Emily Heck, Jan Kolaczinski, Happy Kumah, Chad MacArthur, Anna Phillips, and Ann Varghese for their collaborations with these Ministries; and Barbara Kennedy, Allison Campbell, Amy Doherty, Caius Kim, Jennifer Leopold, Alan Fenwick, David Molyneux, Irene Koek, and Richard Green for their roles in developing the program.

Financial support: This study and the NTD Control Program were supported by the United States Agency for International Development.

Authors' addresses: Mary Linehan, Kathryn L. Zoerhoff, and Eric A. Ottesen, Neglected Tropical Disease Control Program, RTI International, 805 15th Street NW, Suite 601, Washington, DC 20005-2207, E-mails: melinehan@rti.org , kzoerhoff@rti.org , eottesen@taskforce.org , and eottesen@rti.org . Christy Hanson, Infectious Disease Division, U.S. Agency for International Development, 1300 Pennsylvania Avenue NW, 3.7.16, Third Floor, Ronald Reagan Building, Washington, DC 20523, E-mail: chanson@usaid.gov . Angela Weaver, U.S. Agency for International Development, 1300 Pennsylvania Avenue NW, 3.07-27, Third Floor, Ronald Reagan Building, Washington, DC 20523, E-mail: aweaver@usaid.gov . Margaret Baker, Department of International Health, School of Nursing and Health Sciences, Georgetown University, 3700 Reservoir Road NW, Washington, DC 20057-1107, E-mail: mcb93@georgetown.edu . Achille Kabore, Neglected Tropical Disease Control Program, Liverpool Associates in Tropical Health, 805 15th Street, NW Suite 601, Washington, DC 20005-2207, E-mail: akabore@pti.org . Dieudonne Sankara, HTM/NTD/PCT/WHO-HQ, World Health Organization, 20 Avenue Appia, CH-1211 Geneva 27, Switzerland, E-mail: sankarad@who.int . Scott Torres, Indoor Residual Spraying for Malaria Program, RTI International, Mayfair Suites, Second Floor, Parklands Road, PO Box 1181-00621, Nairobi, Kenya, E-mail: storres@rti.org .

Reprint requests: Neglected Tropical Disease Control Program, RTI International, 805 15th Street NW, Suite 601, Washington, DC 20005-2207.

*Address correspondence to Kathryn L. Zoerhoff, Monitoring and Evaluation Associate, Neglected Tropical Disease Control Program, RTI International, 805 15th Street NW, Suite 601, Washington, DC 20005-2207. E-mail: kzoerhoff@rti.org

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