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The Global Emerging Infection Surveillance and Response System (GEIS), a U.S. government tool for improved global biosurveillance: a review of 2009
BMC Public Health volume 11, Article number: S2 (2011)
The Armed Forces Health Surveillance Center, Global Emerging Infections Surveillance and Response System (AFHSC-GEIS) has the mission of performing surveillance for emerging infectious diseases that could affect the United States (U.S.) military. This mission is accomplished by orchestrating a global portfolio of surveillance projects, capacity-building efforts, outbreak investigations and training exercises. In 2009, this portfolio involved 39 funded partners, impacting 92 countries. This article discusses the current biosurveillance landscape, programmatic details of organization and implementation, and key contributions to force health protection and global public health in 2009.
Introduction and background
Despite optimism in the 1960s that mankind had conquered infectious diseases, the world has repeatedly confronted the reality of its continued vulnerability. Two landmark Institute of Medicine (IOM) reports outlined these vulnerabilities [1, 2]. Recent events emphasize the wisdom of these documents, and the fact that the global community must unite to address emerging infectious diseases.
The first of two IOM reports, released in 1992, highlighted the potential role of Department of Defense (DoD) overseas laboratories in addressing the vulnerabilities of emerging infections. DoD has a long history of medical research and development, much of which has been performed through a network of overseas laboratories. Although their geographic locations have changed through time, five laboratories were in operation in 2009: Cairo, Egypt; Nairobi, Kenya; Bangkok, Thailand; Lima, Peru; and Jakarta, Indonesia in 2009 (Figure 1) . Historically, the role of these laboratories was limited almost exclusively to the research and development of products, such as vaccines, antimicrobials or diagnostics, that would benefit the health of DoD forces throughout the world. Surveillance for infectious diseases, however, was minimal. Between 1992 and 1996, numerous documents and communications within DoD recognized the need for global emerging infection surveillance initiatives leveraging these overseas laboratories, and emphasized the commitment of DoD to these endeavors.
In 1996, the Executive Office of the President of the United States issued a Presidential Decision Directive (NSTC-7) stating that current capabilities were inadequate to protect the U.S. or global public health communities from emerging infectious disease (EID) threats . DoD was again specifically noted among various federal agencies as having global presence and expertise that could be leveraged to help improve worldwide EID surveillance and preparedness. With these events, the DoD Global Emerging Infections Surveillance and Response System (DoD-GEIS) was established, thereby expanding the mission of DoD to address threats posed to the U.S. and other nations by newly emerging and re-emerging infectious diseases. This was a timely development: The next decade brought SARS, West Nile virus and avian influenza, to name a few, and more recently, the H1N1 influenza virus emerged in 2009 as a pandemic threat.
In 2008, DoD-GEIS became a Division of the Armed Forces Health Surveillance Center (AFHSC) by direction of the deputy secretary of defense . This move centralized DoD-wide healthcare surveillance initiatives with domestic and overseas laboratory surveillance efforts. In 2009, AFHSC-GEIS provided direction, funding and oversight to a network of 39 partners (Table 1) at approximately 500 sites. Ninety-two countries were impacted with either active surveillance, capacity-building initiatives or participation in training exercises (Figure 1). This paper will summarize implementation of this global DoD laboratory surveillance network and its contributions in 2009, and discuss potential for the future as the U.S. government becomes increasingly proactive in global biosurveillance.
The current global biosurveillance landscape
In addition to AFHSC-GEIS, many other DoD, U.S. government and U.S. nongovernmental organizations engage in surveillance or capacity-building activities throughout the world [6, 7]. In 2009, the U.S. Agency for International Development (USAID) spent more than $1.7 billion on health and over $1.4 billion on humanitarian assistance . Fiscal year 2009 appropriations by the U.S. Congress totaled $33.7 million for the Centers for Disease Control and Prevention’s (CDC) Global Disease Detection Program, the principal and most visible CDC program for developing and strengthening global public health capacity to rapidly identify and contain disease threats from around the world. The total budget for CDC’s global health programs in fiscal year 2009—including the Global AIDS Program, Global Immunization Program, Global Malaria Program and others—was $308.8 million . The U.S. Department of State’s Biological Engagement Program (BEP) received congressional appropriations of $27 million in fiscal year 2009 to engage scientists internationally on issues related to disease surveillance and detection, biosafety and biosecurity. The U.S. Department of Agriculture (USDA) addresses animal health surveillance in the U.S., but is also engaged internationally in capacity building, research and biological control, and outbreak response, with a focus on identifying and evaluating biological agents that could impact global commerce of agricultural products . USDA is also the official U.S. representative to the World Organisation for Animal Health (OIE).
Through Defense Health Program funding, the assistant secretary of defense for health affairs provides $52 million annually to AFHSC-GEIS. The assistant to the secretary of defense for nuclear and chemical and biological defense programs recently embraced emerging infections as a threat to national security, placing global surveillance also within the scope of that organization . Implemented largely through the Defense Threat Reduction Agency, historically that organization’s focus has been threat-agent reduction and containment in the former Soviet Union. Authorization to extend globally and beyond threat agents is in process and will be conducted in part through the agency’s Cooperative Biological Engagement Program. This is likely to result in an additional infusion of resources into DoD’s global surveillance efforts. Although not directly involved in surveillance efforts, the Military Infectious Disease Research Program (MIDRP) has a mission of protecting the U.S. military against infectious diseases through research and development projects designed to develop products for mitigation, such as vaccines, medications or vector-control systems. Excluding pediatric vaccines, DoD had a major role in developing and licensing 40 percent of currently available vaccines for adults in the U.S. . Most drugs licensed for the treatment of malaria were also products of DoD research and development [13, 14]. AFHSC-GEIS surveillance provides baseline infectious disease risk data that directly influences priorities and viable geographic locations for the conduct of various projects within the MIDRP.
Much of the justification for engagement by the U.S. government in this work falls under the category of “health diplomacy.” The meaning of “global health diplomacy” can be controversial, but a commonly accepted definition by the University of California at San Francisco is “political change activity that meets the dual goals of improving global health and maintaining and improving international relations abroad, particularly in conflict areas and resource-poor environments.”
The involvement of DoD partners throughout the world in implementing this program can clearly be seen as serving a global health diplomacy role. By conducting surveillance and capacity building and assisting with training and outbreak investigations, all integrated into the functions and capabilities of host-country agencies, relationships are forged and trust is developed. International relations abroad are improved. Other DoD organizations work in this broad field of health diplomacy, but less directly in active biosurveillance.
Funding avenues and oversight for these different U.S. government health and surveillance initiatives are independent of each other, and coordination is complex. In a recent publication, the Center for Strategic and International Studies commented that with expanding efforts, agencies should leverage the existing successful programs, and seek a “unity of effort.” . The release in November 2009 of the National Strategy for Countering Biological Threats (Presidential Policy Directive-2) also emphasizes the need for coordination: “No single stakeholder can fully address the challenge of biological threats on its own” . This document uses similar terminology as many of the mid-1990s documents that resulted in the development of DoD-GEIS.
Why the Department of Defense?
The global laboratory assets of DoD have long been recognized as valuable platforms from which to conduct biosurveillance. Each laboratory is “sponsored” in-country by either the Ministry of Defense or Ministry of Health. In addition, close working relationships exist with other components of the host and neighboring countries’ governments and academic institutions. Leveraging and empowering these relationships is a formula for success with expanded activities. Maintaining personnel at these military laboratories has also proven sustainable over time, when other U.S. government programs found this to be difficult. DoD’s unique ability to provide valuable logistical support is a factor, as is its global integrated health care system meeting the health needs of uniformed families throughout the world that can help determine exposures and risk. The synergy between this system and the DoD laboratory system is becoming clear now that both organizations exist at AFHSC.
Another reason for DoD engagement in these endeavors lies in DoD’s mission to “deter war and protect the security of our country” . Combat aggressors are but one threat to our security. In the words of James Baldwin, novelist and civil rights activist, “The most dangerous creation of any society is the man who has nothing to lose.” Endemic diseases in many resource-poor settings are a cause of instability. Each year, more than 1.6 million people die from diarrheal disease, 800,000 from malaria and 20,000 from dengue fever [18–20]. This burden of known endemic diseases imposes an economic toll and resulting instability. In contrast, emerging infections, whether naturally occurring or the result of human introductions, can result in social unrest and instability on a scale quite out of proportion to the level of risk they introduce . Though new agents have the potential for high morbidity and mortality, fear can have an even greater impact.
One example is the severe acute respiratory syndrome (SARS) that rapidly spread around the world in 2003. By midyear, 8,098 individuals were known to have been infected with SARS, resulting in 774 deaths. In the scope of international infectious diseases, this toll on human life was minor. However, the economic impact is estimated at between $40 billion and $52 billion . Likewise, 17 infections and five deaths were attributed to the intentional anthrax attacks in 2001. These small numbers do not adequately speak to the crippling disruption of services or huge economic losses incurred. According to a recent IOM report, “Global health and national security are inexorably intertwined” .
Considering these facts, the enormous importance of early identification and mitigation of infectious disease threats is a critical component of a national defense strategy to “deter war and protect the security of our country.”
Implementation of the AFHSC/GEIS program: methods
The GEIS system functions on a model of “priority pillars” and “strategic steps” (Figure 2). The priority infectious disease pillars include respiratory, gastrointestinal, febrile and vector-borne, antimicrobial-resistant, and sexually transmitted infections. The strategic steps include surveillance and response; training and capacity building; research, innovation and capacity building; and communication of value added. Through integrated implementation of the strategic steps, a comprehensive yet flexible program is created which recognizes the needs of host and partner countries.
Funding for global surveillance initiatives in 2009 was approximately $52 million; $40 million of this was for pandemic/avian influenza initiatives (respiratory pillar), with the remainder available for surveillance in the other EID pillars. In preparation for distribution of these funds, a request for proposals was circulated among partner laboratories in the third quarter of fiscal 2008. A total of 198 proposals were received and evaluated by an internal review board of AFHSC staff. Each proposal was evaluated based on a) potential to fill a critical gap in public health programs, b) likelihood of tri-service or DoD-wide benefits, c) facilitation of timely public health actions, d) responsiveness to critical operational theater or regional needs, e) quality of epidemiology and science, f) leveraging of existing strengths, and g) accessibility of nonfiscal resources needed for execution. In addition, prior performance of the requesting organization and principal investigator was taken into consideration. Proposals were ranked based on scores received, and a cutoff level for funding was assigned based on score and available funding. An external review board, not associated with AFHSC-GEIS and representing all three major uniformed services, reviewed overall funding decisions and provided recommendations. Finally, GEIS and AFHSC directors were briefed and given the opportunity for input. Of the 198 proposals received, full or partial funding was available for the top-ranked 66 percent (130 of 198 proposals), and 56 percent of requested funding was allocated.
Communication of value added
Communication within and outside the network was conducted in a variety of ways: required quarterly reports, monthly conference calls with awarded partners, consolidated DoD influenza reports (with variable frequency from daily to weekly during the emerging 2009 H1N1 pandemic), site visits with program reviews, peer-reviewed publications, and presentations at multiple DoD and civilian international conferences. Results were reported only with local-host or partner-country notification and concurrence. In general, the information requested and shared by the GEIS network was aggregate in nature. GEIS does not archive extensive data sets from partners or host countries. Analysis and interpretation is largely done by the partner conducting the work, in collaboration with the host country, and with ultimate consideration of national sovereignty and transparency in the process.
The central coordination of this global DoD surveillance system afforded multiple opportunities for enhanced utilization of partner capabilities, as well as concise information sharing with other DoD organizations and external agencies (Table 2). The many examples share a central theme of leveraging global visibility and connecting needs with capabilities.
Communication with the World Health Organization (WHO) and CDC is a priority, with a DoD liaison positioned in both organizations to facilitate bilateral information exchange. The value added to these two organizations by the GEIS network is clear in the examples of the WHO reference laboratory status of Naval Medical Research Unit Number 3 (NAMRU-3) in Cairo, Egypt, and U.S. Army Medical Research Unit-Kenya (USAMRU-K). Both laboratories were highly leveraged in training and laboratory capacity building during the 2009 H1N1 pandemic . Numerous influenza contributions to the WHO’s Global Influenza Surveillance Network through CDC is another example. These contributions have resulted in numerous examples of viruses isolated by DoD’s surveillance network being used as reference strains and the virus seed strain for seasonally available influenza vaccines [25, 26].
This global DoD surveillance network should not and does not operate in a vacuum. A review of the DoD-GEIS influenza programs by IOM in 2007, conducted after the first year that the network received avian influenza/pandemic influenza (AI/PI) supplemental funds, commented: “DoD-GEIS should further strengthen its coordination and collaboration on pandemic influenza … with all U.S. partners … These partners include HHS [U.S. Department of Health and Human Services], CDC,…”. The rapid communication to CDC of the novel H1N1 strains identified by two GEIS partner laboratories before any other public health laboratory (see Table 3) is evidence of the implementation of this recommendation. Though funded partners clearly understand the need for timely processing of samples and expeditious communication, it must be continually reinforced throughout the global surveillance network. Personnel turnover is high, and communication of these ongoing needs is a priority.
Accomplishments: fiscal year 2009
Publications and presentations
Another metric for success is the number of publications in peer-reviewed journals and presentations given by network partners. An accurate count is difficult because the independent network partners leverage funding from various sources for their initiatives. Nevertheless, 112 manuscripts associated with projects partly or wholly supported by AFHSC-GEIS were published in 2009; the number of poster sessions and presentations at various public and private conferences was far higher.
Broadly speaking, 33 peer-reviewed publications encompassed febrile and vector-borne infections and other infectious diseases; 25 were in the realm of respiratory infections, including influenza; 19 described emerging infections; 18 were associated with malaria; nine were about gastrointestinal infection; seven described antimicrobial-resistant organisms; and one was related to sexually transmitted infections. Though populations under surveillance were often a mixture of military and civilian, 28 of these publications were directly related to U.S. or foreign military populations.
These numbers attest to the scientific rigor with which partners conduct their work, their ability to leverage funding to create a relatively balanced portfolio covering all five pillars of infectious disease threats of military importance, and their emphasis on military populations.
The way forward: tools for success
International Health Regulations (2005)
The WHO International Health Regulations, established in 1969, were originally intended to identify several specific diseases of concern (plague, yellow fever, cholera and smallpox) among travelers entering a given country. The events of the past few decades have made it clear that a new paradigm was needed to minimize the global impact of an emerging pandemic and its toll on human life. To this end, the International Health Regulations (2005), or IHR (2005), were formally adopted by the WHO 58th World Health Assembly on May 23, 2005, and took effect on June 15, 2007 . The focus of these new guidelines changed from specific diseases of concern to any event that could be considered a “public health emergency of international concern.” Assessments of current capabilities in countries throughout the world were completed in 2009, and compliance with minimum standards of detection and reporting is required by 2012. Building local capability and infrastructure for compliance is the clear goal in IHR (2005), and the regulations acknowledge and encourage countries and organizations that are able to assist resource-poor countries in their compliance process.
Considerable coordination and communication with in-country ministries, academic institutions and other in-country government assets is done by AFSHC-GEIS global partners. However, collaboration and capacity building conducted by DoD partners is being re-examined to comply with a broader U.S. government response, the National Strategy for Countering Biological Threats, and the IHR (2005) framework. The White House National Security staff is playing an active role in this U.S. government coordination. By conducting our program in coordination with this whole of US Government, then our capacity building, outbreak assistance and facilitating in-country diagnostic capabilities with host countries will meet the objectives of all by a) reinforcing amiable relationships between host-country government public health assets and DoD partners; b) developing the capability to report “public health emergencies of international concern,” whereby the entire global community and DoD learns, and world preparations to minimize impact can proceed in a unified and transparent manner; and c) improving DoD’s situational awareness through close, transparent, trusting relationships with host countries, even if an actual public health emergency of international concern does not occur.
Military-to-military cooperation and collaboration
As briefly discussed in the biosurveillance landscape section of this paper, many U.S. government organizations are becoming involved in global biosurveillance. The mission of DoD’s overseas laboratories necessitates continued engagement with in-country public health authorities. However, with rapidly increasing involvement of other U.S. government agencies, a unique niche that U.S. uniformed officers throughout the world can and should expand engagement is with their global uniformed counterparts. In many cases, militaries are the major providers of health care in their countries, with abilities that far exceed their civilian programs. Despite political agendas, remarkable progress in facilitating open lines of communication can occur when two researchers or public health professionals, regardless of cultural or economic background, establish mutual rapport for a mutual interest: optimal health of their uniformed service members.
Although many military-to-military lines of communication and collaboration currently exist (Table 5), another mechanism AFHSC used to facilitate increased activities in 2009 began with an expanded relationship with the International Committee of Military Medicine (ICMM). ICMM was established in 1921 by Belgian and U.S. medical officers (Commander Medical Officer Jules Voncken and Captain William Bainbridge) after World War I “revealed the importance of closer cooperation between armed forces medical services worldwide” . With 104 member countries, ICMM is an unbiased, transparent organization with the goals of maintaining and strengthening the bonds between all medical services of member states, promoting medico-military scientific activities, and developing and participating in humanitarian operations.
Because of its unbiased membership policy, ICMM is the only military organization with a formal in-force memorandum of agreement with WHO. Through direct engagements or indirect facilitation and empowerment with ICMM, opportunities are being explored to work with foreign militaries, to further facilitate IHR (2005) compliance, and to facilitate force health protection and global public health in concert with WHO. Joint initiatives include co-sponsoring a forum titled “Emerging Infectious Diseases: the Military’s Role under International Health Regulations (2005)” in September 2010 in St. Petersburg, Russia, and movement toward development of a military public health network to coordinate and provide access to training, resources, and expertise in public health practice and epidemiologic techniques for member state use.
U.S. DoD has a long and impressive history of infectious disease research and product development. The GEIS program was developed at a time of need by DoD-sponsored U.S. and overseas research laboratories. The wisdom of establishing improved global DoD EID surveillance capabilities is reinforced by numerous contributions to global outbreaks, most recently the 2009 H1N1 pandemic. The greatly increased interest by other DoD organizations and the U.S. government as a whole also reinforces this wisdom.
For optimal preparedness, surveillance is an ongoing process, not one that is implemented only in times of public health emergency. Sustaining these programs also avoids negative perceptions by foreign governments of U.S. involvement only with the “surveillance priority du jour.” The right mix of empowering surveillance activities with capacity building is important to mitigate perceptions of taking but not giving. With the framework of current U.S. government guidelines, such as the National Strategy for Countering Biological Threats and IHR (2005), the world is closer than ever to truly working together on surveillance and control of infectious diseases without consideration of borders.
Institute of Medicine (U.S.) Committee on Emerging Microbial Threats to Health: Emerging Infections: Microbial Threats to Health in the United States. Edited by: Lederberg J, Shope RE, Oaks SC. 1992, Washington, DC: National Academy Press
Institute of Medicine (U.S.) Committee on Emerging Microbial Threats to Health in the 21st Century: Microbial Threats to Health: Emergence, Detection, and Response. Edited by: Smolinski MS, Hamburg MA, Lederberg J. 2003, Washington, DC: National Academies Press
Sueker JJ, Chretien JP, Gaydos JC, Russell KL: Global infectious disease surveillance at DoD overseas laboratories, 1999-2007. Am J Trop Med Hyg. 2010, 82 (1): 23-27. 10.4269/ajtmh.2010.09-0139.
National Science and Technology Council, Presidential Decision Directive-7: Addressing the Threat of Emerging Infectious Diseases. 1996, Washington, DC
Deputy Secretary of Defense Memorandum: Establishing an Armed Forces Health Surveillance Center. 2008, Washington, DC
Castillo-Salgado C: Trends and Directions of Global Public Health Surveillance. Epidemiol Rev. 2010, 32: 93-109. 10.1093/epirev/mxq008.
Hitchcock P, Chamberlain A, Van Wagoner M, Inglesby TV, O'Toole T: Challenges to global surveillance and response to infectious disease outbreaks of international importance. Biosecur Bioterror. 2007, 5 (3): 206-227. 10.1089/bsp.2007.0041.
USAID: Fiscal Year 2009: Agency Financial Report, Partnerships for a Better Life. 2010, Washington, DC: US Agency for International Development, 150-
111th U.S. Congress House Resolution 1105: Ominibus Appropriations Act of 2009. 2009, Washington, DC, 1315-
USDA-APHIS: International Services Roles. [http://www.aphis.usda.gov/international_safeguarding/index.shtml]
Assistant Secretary of Defense-Nuclear and Chemical and Biological Defense Programs: Including Emerging Infectious Disease into the Biodefense Mission Set. 2009, Washington, DC
Grabenstein JD, Pittman PR, Greenwood JT, Engler RJ: Immunization to protect the US armed forces: heritage, current practice, and prospects. Epidemiol Rev. 2006, 28: 3-26. 10.1093/epirev/mxj003.
Kitchen LW, Vaughn DW: Role of US military research programs in the development of US-licensed vaccines for naturally occurring infectious diseases. Vaccine. 2007, 25 (41): 7017-7030. 10.1016/j.vaccine.2007.07.030.
Kitchen LW, Vaughn DW, Skillman DR: Role of US military research programs in the development of US Food and Drug Administration-approved antimalarial drugs. Clin Infect Dis. 2006, 43 (1): 67-71. 10.1086/504873.
Center for Strategic and International Studies: U.S. leadership in global health: preparation recommendations for expanded engagement. Commision on Smart Global Health Policy-Options for US Support. Volume November. 2009
National Security Council, Presidential Policy Directive-2: National Strategy for Countering Biological Threats. 2009, Washington, DC
DoD 101: An Introductory Overview of the Department of Defense. [http://www.defense.gov/pubs/dod101/]
Diarrheal Disease. [http://www.oneworldhealth.org/diarrheal_disease]
World Health Organization: World malaria report: 2009. 2009, Geneva: WHO, 78-
World Health Organization: Vector-Borne Viral Infections. Initiative for Vaccine Research. 2010, 6-
United States of America: United States Government Efforts to Support Global Capacity for Disease Surveillance and Response. Convention on the Prohibition of the Development, Production and Stockpiling of Biological and Toxin Weapons and on Their Destruction: 7-11 Dec 2009. 2009, Geneva, Switzerland
Knobler S, Institute of Medicine (U.S.) Forum on Microbial Threats, Institute of Medicine (U.S.) Board on Global Health: Learning from SARS: preparing for the next disease outbreak. Workshop summary. 2004, Washington, DC: National Academies Press
Institute of Medicine (U.S.) Committee for the Assessment of DoD-GEIS Influenza Surveillance and Response Programs: Review of the DoD-GEIS Influenza Programs: Strengthening Global Surveillance and Response. 2008, Washington, DC: National Academies Press
Burke R, Vest K, Eick A, Sanchez J, Johns M, Pavlin J, Jarman R, Mothershead J, Quintana M, Palys T, et al: Review: Department of Defense influenza and other respiratory disease surveillance during the 2009 pandemic. BMC Public Health. 2011
Sanchez J, Johns M, Burke R, Vest K, Fukuda M, Yoon I, Lon C, Quintana M, Schnabel D, Pimentel G, et al: Capacity-building efforts by the AFHSC-GEIS program. BMC Public Health. 2011
Petruccelli B, Otto JL, Johns MC, Lipnick RJ: U.S. military public health surveillance and response to pandemic influenza A (H1N1). Am J Prev Med. 2010, 39 (5): 483-486. 10.1016/j.amepre.2010.07.006.
Bonventre EV, Hicks KH, Okutani SM: U.S. National Security and Global Health: An Analysis of Global Health Engagement by the U.S. Department of Defense-A Report of the CSIS Global Health Policy Center-Working Draft. 2009, Washington DC: Center for Strategic and International Studies, 31-
World Health Organization: International Health Regulations (2005). 2008, Geneva, Switzerland: World Health Organization Press, 2nd
Comite International de Medecine Militaire-International Committee of Military Medicine. [http://www.cimm-icmm.org/index.html]
The authors wish to thank the numerous individuals who perform global surveillance as part of the AFHSC-GEIS network. They also thank those individuals in the Ministries of Health, Ministries of Defense, Ministries of Agriculture and other ministries and academic/governmental organizations of partner nations whose efforts have contributed to the success of the network. If not for their trust and collaboration, none of this work would have taken place. The authors hope and desire that the partner nations gained from the collaboration and results as much as the authors did.
The opinions stated in this paper are those of the authors and do not represent the official position of the U.S. DoD.
This article has been published as part of BMC Public Health Volume 11 Supplement 1, 2011: Department of Defense Global Emerging Infections Surveillance and Response System (GEIS): an update for 2009. The full contents of the supplement are available online at http://www.biomedcentral.com/1471-2458/11?issue=S2.
To the best of their knowledge, the authors report no competing interests.
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Russell, K.L., Rubenstein, J., Burke, R.L. et al. The Global Emerging Infection Surveillance and Response System (GEIS), a U.S. government tool for improved global biosurveillance: a review of 2009. BMC Public Health 11, S2 (2011). https://doi.org/10.1186/1471-2458-11-S2-S2
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