Open access, freely available online Correspondence Estimating the Number of Antiretroviral Treatment Facilities Based on the Wilson–Blower Method

Ntambwe Malangu The implementation of the comprehensive plan for the care, management, and treatment of HIV and AIDS in South Africa [1] needs to be supported by all. It is encouraging to note that Wilson and Blower [2] used South Africa to develop a novel method to determine the optimal strategy for allocating antiretroviral treatment (ART) sites among healthcare facilities (HCFs) in KwaZulu–Natal. An equitable allocation of HCFs is necessary to ensure that each individual with HIV will have an equal chance of receiving antiretroviral drugs (ARVs). We have applied their method to determine the number of ART HCFs per district in KwaZulu–Natal. We fi rst set out to assemble basic details about the KwaZulu–Natal health districts, namely, population and number of hospitals and fi xed and mobile clinics. Secondly, by using population data as reported in the KwaZulu– Natal Department of Health 2004 annual report [3], and based on a 10% HIV prevalence, we determined the HIV population per district and also as a percentage of the total HIV population in the province. Finally, we calculated the number of ART HCFs, based on the premise that 54 ART HCFs will serve 100% of the HIV population in the province. By contrasting the estimated number of ART HCFs with the current ART HCFs, we calculated the number of ART HCFs that still need to be established. The national target for access to HCFs is 10,000 habitants per one fi xed primary health-care (PHC) facility [2]. A PHC facility could be a clinic, a community health center, or a hospital. At present, there is one fi xed PHC facility for 17,215 inhabitants in KwaZulu–Natal [3]. With regard to ART, the 54 HCFs proposed by Wilson and Blower translate to 18,076 people with HIV per facility (Table 1). This number is close to the actual fi gure of 17,215 inhabitants per facility in the province. In terms of equity, it could be argued, for instance, that the two facilities in the eThekwini district cannot be expected to provide ARVs to the estimated 319,994 individuals with HIV. In comparison, the Umziyathi, Amajuba, Umkhanyakude, Uthungulu, and Ugu districts currently have the same number of ART HCFs as eThekwini, but serve smaller populations (Table 1). This refl ects the fact that the choice of the current facilities was guided more by practical considerations, such as availability of staff and infrastructure, than by the principle of equity as suggested by the World Health Organization [4]. From our calculations, it seems that in order to achieve treatment equity for individuals with HIV in KwaZulu–Natal, more ARV HCFs should be established as follows: 15 in eThekwini, four each in Umgungundlovu and Zululand, three each in Uthukela and Uthungulu, two each in Ugu and iLembe, and one each in Amajuba, Sisonke, Umzinyathi, and Umkhanyakude. As a recommendation, future rollout of ART should take into consideration the principle of equity. This will ensure that all people with HIV have equal access to ARVs from their nearest HCF. We show that by applying the Wilson–Blower method, it is possible to determine the number of health-care facilities where ARVs would be equitably provided. This correspondence letter was peer reviewed.

We want to congratulate Chinnock and colleagues, who summarize very well the main problems that evidence-based medicine faces in developing countries [1].As members of the Iberoamerican Cochrane Network, we would like to share some lessons learned and highlight possible solutions to the problems identifi ed by Chinnock et al. [1].
We have learned from the experience of working in and with Latin American countries that one of the fi rst barriers to overcome is inequity in accessing evidence.The second barrier is the English language.Efforts have been made by our network to overcome both barriers by providing free access to Biblioteca Cochrane Plus (BCP) (http:⁄⁄www.bibliotecacochrane.net).In addition to systematic reviews and protocols, this database contains evidence-based information not indexed in other sources.
However, ensuring access does not necessarily mean that reviews will be used in decision making.Many local problems do not appear in the BCP material, but those that are most prevalent and those with high impact on public health and clinical practice of these countries have been reviewed.Nevertheless, few health professionals apply the results of such reviews.One possible solution is that Cochrane centers, groups, or fi elds, most of which are based in developed countries, could invest resources in mass dissemination and promote their activities through organizations such as the Pan American Health Organization.This would encourage not only the use of systematic reviews, but also promote an interest in the Cochrane Collaboration from health authorities in the Americas.
Another aspect revealed in Chinnock et al.'s article is the need to get more people from developing countries involved in writing and peer-reviewing systematic reviews.The nature of the Cochrane Collaboration facilitates this, and we have had excellent results when working with several of its groups and fi elds.However, developing countries have a limited number of people qualifi ed to participate in the writing and peer-reviewing of systematic reviews.Most of those who have the necessary skills also have an enormous load of teaching and clinical care, their salaries are insuffi cient to support a white-collar lifestyle, and, thus, private practice is the most common means of augmenting earnings.These economic issues are by far the major factor underlying the relative lack of research in developing countries [2].Cochrane groups and centers based in developed countries should identify potential reviewers in developing countries and invest resources that provide them with spare time to devote to the promotion, production, and evaluation of systematic reviews.This idea is in line with the Millennium Development Goals [3], specifi cally number eight, which addresses the need to develop a global partnership for development.Nevertheless, the concerns exposed by Chinnock and colleagues in connection with the search for reviews performed in developing countries would decrease if the use of databases specifi c to these regions, such as LILACS (Literatura Latinoamericana en Ciencias de la Salud) in Latin America, was encouraged and if the use and development of these databases were supported.
Finally, we consider that advocacy on the importance of research and evidence-based public health should be strengthened in developing countries.This has been highlighted by Bernardo Houssay, the fi rst Latin American honored with the Nobel Prize, who said, "Science is only science when it involves constant progress and improvement arising from research.Thus, there are only two possible standpoints: that of tuggers and that of others being tugged.In other words, you may either create knowledge at the same time others do, or accept a subordinate position and depend on what others produce."When the response to his views was different from what he expected, he added, "It would not be ethical to base a research strategy on the unfair exploitation of sacrifi ces made by those with exceptional and determined minds.Wise countries do not live waiting for saints or miracles to occur" (quoted in [4]).

Jordi Pardo
Argentine Collaborating Center of the Iberoamerican Cochrane Network Buenos Aires, Argentina primates have failed as research models virtually whenever they have been used.
As a partial list of failures, allow me to submit the notorious forced smoking experiments, which allowed cigarettes to be promoted widely for decades; the abject failure of a quartercentury of primate research on AIDS to provide any useful insights; the false leads and dangerous vaccines produced during polio research (verifi ed by Albert Sabin, himself); the failure of primate studies to improve risks for birth defects and premature births; and the failure of monkey studies to identify nonsteroidal anti-infl ammatory drug cardiovascular risk [1].
The PLoS Medicine editors state in hopeful language that the Lassa fever vaccine was successful in four monkeys, and, thus, is a suitable agent for human study [2].Recall that VaxGen's AIDS vaccine (AIDSVAX) showed great success in primate studies, but was an abject failure in two human clinical trials, including a trial of over 2,500 injection drug users in Thailand [3] and a multinational trial of over 5,000 high-risk individuals [4].
Consider the fruitless decades-long effort to produce an AIDS vaccine in primates, the failure to produce even a single case of human AIDS in any primate studied, or the failure to identify even one useful AIDS drug from primate studies.Genetic and physiological imperatives dictate that no animal model, even higher primates, gives information applicable to humans.The Human Genome Project [5] tells us that there is suffi cient genetic diversity among humans that pharmacogenetic and pharmacogenomic techniques will have an increasing role in overcoming problems related to polymorphisms and other variations.We can't even apply scientifi c fi ndings uniformly to humans, and PLoS Medicine is now promoting monkey research?I am very disappointed that PLoS Medicine has regressed to reporting animal research.It is discouraging that in this era of rapid biomedical advancement, and appropriate relegation of animal research to the historical dustbin, PLoS has chosen to re-introduce an anachronistic, medically discredited, and unethical research tool to its reporting.
After interviewing 63 experts, Salamanca-Buentello et al. [1] identifi ed the ten main nanotechnologies that could provide a solution to problems involving water, agriculture, and health.Overfl owing with good intentions, the proposal refl ects the idea that if a problem can be identifi ed, all that has to be done is apply a suitable technology and it will be solved.Most of the examples do not take into account that the relationship between science and society is much more complex.
The authors suggest that quantum dots could detect HIV molecules in the early stages, facilitating the treatment and reducing the number of new cases.The authors seem to forget the story of recent years, which has been one of open war between multinational pharmaceutical corporations and countries seeking to manufacture antiretrovirals.Nanotechnology products are already being patented.A patent in the US costs US$30 000 in legal bureaucracy, and a worldwide patent may be as much as US$250 000 [2].The moral of the story: the effi ciency and implications of the application of technology depend on the social context.
The article identifi es nanotechnology as the solution to fi ve of the eight UN Millennium Development Goals [3].Among these solutions are nanosensors to improve the dosage of water and fertilization of plants, and hopefully reduce poverty and hunger.Not so long ago, genetically modifi ed organisms were hailed as the solution that would put an end to hunger.However, they ended up being used mainly in developed countries.There has been no improvement for developing countries; quite the contrary, transgenics turned up where they were not wanted, as was the case in Oaxaca [4].The moral of the story: the choice of technology is not a neutral process.It is not necessarily true that the technology that is best and meets our needs will be the one to survive.
In a previous article [5] three of the same authors maintained that the position adopted by Prince Charlesarguing that nanotechnology will widen the gap between rich and poor countries-and the position of the Action Group on Erosion, Technology and Concentration-requesting a moratorium on manufacture and commercialization of synthetic nanoparticles-both ignore the voices of people in developing countries.With their research the authors intended to fi ll this gap.But the opinion of scientists involved in nanotechnology does not necessarily fall in with the most appropriate pathways for satisfying the needs of the poor.We may concur that infectious diseases are one of the main problems that the developing world is facing, but we may differ radically on how a solution to this problem should be attained.Prevention is not the same thing as cure.Nanotechnology is not necessary to reduce malaria radically, as is suggested by the authors.In Henan Province, China, malaria was reduced by 99% between 1965 and 1990 as a result of social mobilization, backed up by fumigation, the use of mosquito nets, and traditional medicine based on artemisinin [6].Viet Nam reduced the number of malariarelated deaths by 97% between 1992 and 1997 with similar methods [7].The moral of the story: there are many means to an end, and technology is not always the solution.Organizing people can be just as important.

Patrick McGrath
With reference to Awasthi and colleagues' Policy Forum [1], International Campaign to Revitalise Academic Medicine (ICRAM) has done an excellent service by provoking thought about the future of academic medicine by outlining fi ve scenarios.However, all of the scenarios are seriously defi cient because they do not suffi ciently incorporate in their vision other health disciplines and professions.Increasingly, translational research and knowledge transfer depend on interdisciplinary teams.Good patient care requires team approaches.Academic medicine is realizing the value of collaboration and is opening itself to disciplines such as nursing, psychology, occupational therapy, and physiotherapy.In addition, disciplines such as health informatics are vital.Envisioning the successful future of academic medicine requires collegial inclusion of other health-related disciplines.

Patrick McGrath
Dalhousie University

Table 1 .
Number of ART HCF Calculated for Each District © 2005 Ntambwe Malangu.This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.The author has declared that no competing interests exist.