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      The laboratory health system and its response to the Ebola virus disease outbreak in Liberia

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          Abstract

          The laboratory system in Liberia has generally been fragmented and uncoordinated. Accordingly, the country’s Ministry of Health established the National Reference Laboratory to strengthen and sustain laboratory services. However, diagnostic testing services were often limited to clinical tests performed in health facilities, with the functionality of the National Reference Laboratory restricted to performing testing services for a limited number of epidemic-prone diseases. The lack of testing capacity in-country for Lassa fever and other haemorrhagic fevers affected the response of the country’s health system during the onset of the Ebola virus disease (EVD) outbreak. Based on the experiences of the EVD outbreak, efforts were initiated to strengthen the laboratory system and infrastructure, enhance human resource capacity, and invest in diagnostic services and public health surveillance to inform admittance, treatment, and discharge decisions. In this article, we briefly describe the pre-EVD laboratory capability in Liberia, and extensively explore the post-EVD strengthening initiatives to enhance capacity, mobilise resources and coordinate disaster response with international partners to rebuild the laboratory infrastructure in the country. Now that the EVD outbreak has ended, additional initiatives are needed to revise the laboratory strategic and operational plan for post-EVD relevance, promote continual human resource capacity, institute accreditation and validation programmes, and coordinate the investment strategy to strengthen and sustain the preparedness of the laboratory sector to mitigate future emerging and re-emerging infectious diseases.

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          Most cited references11

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          Multicolored silver nanoparticles for multiplexed disease diagnostics: distinguishing dengue, yellow fever, and Ebola viruses.

          Rapid point-of-care (POC) diagnostic devices are needed for field-forward screening of severe acute systemic febrile illnesses. Multiplexed rapid lateral flow diagnostics have the potential to distinguish among multiple pathogens, thereby facilitating diagnosis and improving patient care. Here, we present a platform for multiplexed pathogen detection using multi-colored silver nanoplates. This design requires no external excitation source and permits multiplexed analysis in a single channel, facilitating integration and manufacturing.
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            Towards detection and diagnosis of Ebola virus disease at point-of-care

            Ebola outbreak-2014 (mainly Zaire strain related Ebola virus) has been declared most widely spread deadly persistent epidemic due to unavailability of rapid diagnostic, detection, and therapeutics. Ebola virus disease (EVD), a severe viral hemorrhagic fever syndrome caused by Ebola virus (EBOV) is transmitted by direct contact with the body fluids of infected person and objects contaminated with virus or infected animals. World Health Organization (WHO) has declared EVD epidemic as public health emergency of international concern with severe global economic burden. At fatal EBOV infection stage, patients usually die before the antibody response. Currently, rapid blood tests to diagnose EBOV infection include the antigen or antibodies capture using ELISA and RNA detection using RT/Q-PCR within 3–10 days after the onset of symptoms. Moreover, few nanotechnology-based colorimetric and paper-based immunoassay methods have been recently reported to detect Ebola virus. Unfortunately, these methods are limited to laboratory only. As state-of-the art (SoA) diagnostics time to confirm Ebola infection, varies from 6 h to about 3 days, it causes delay in therapeutic approaches. Thus developing a cost-effective, rapid, sensitive, and selective sensor to detect EVD at point-of-care (POC) is certainly worth exploring to establish rapid diagnostics to decide therapeutics. This review highlights SoA of Ebola diagnostics and also a call to develop rapid, selective and sensitive POC detection of EBOV for global health care. We propose that adopting miniaturized electrochemical EBOV immunosensing can detect virus level at pM concentration within ∼40 min compared to 3 days of ELISA test at nM levels.
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              The role of rapid diagnostics in managing Ebola epidemics

              Ebola emerged in West Africa around December 2013 and swept through Guinea, Sierra Leone and Liberia, giving rise to 27,748 confirmed, probable and suspected cases reported by 29 July 2015. Case diagnoses during the epidemic have relied on polymerase chain reaction-based tests. Owing to limited laboratory capacity and local transport infrastructure, the delays from sample collection to test results being available have often been 2 days or more. Point-of-care rapid diagnostic tests offer the potential to substantially reduce these delays. We review Ebola rapid diagnostic tests approved by the World Health Organization and those currently in development. Such rapid diagnostic tests could allow early triaging of patients, thereby reducing the potential for nosocomial transmission. In addition, despite the lower test accuracy, rapid diagnostic test-based diagnosis may be beneficial in some contexts because of the reduced time spent by uninfected individuals in health-care settings where they may be at increased risk of infection; this also frees up hospital beds. We use mathematical modelling to explore the potential benefits of diagnostic testing strategies involving rapid diagnostic tests alone and in combination with polymerase chain reaction testing. Our analysis indicates that the use of rapid diagnostic tests with sensitivity and specificity comparable with those currently under development always enhances control, whether evaluated at a health-care-unit or population level. If such tests had been available throughout the recent epidemic, we estimate, for Sierra Leone, that their use in combination with confirmatory polymerase chain-reaction testing might have reduced the scale of the epidemic by over a third.
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                Author and article information

                Journal
                Afr J Lab Med
                Afr J Lab Med
                AJLM
                African Journal of Laboratory Medicine
                AOSIS
                2225-2002
                2225-2010
                31 October 2016
                2016
                : 5
                : 3
                : 509
                Affiliations
                [1 ]Incident Management System, Emergency Operations Center, Ministry of Health, Monrovia, Liberia
                [2 ]Partnership for Research on Ebola Virus in Liberia, Liberia-US Clinical Research Partnership Program, First Floor, John F. Kennedy Medical Center, Monrovia, Liberia
                [3 ]National Reference Laboratory, Ministry of Health, Charlesville, Margibi County, Liberia
                [4 ]Africabio Enterprises, Inc., Payne Avenue, Sinkor, Monrovia, Liberia
                [5 ]Liberia Institute for Biomedical Research, Ministry of Health, Charlesville, Margibi County, Liberia
                [6 ]National Research Ethics Board, Partnership for Research on Ebola Virus in Liberia, First Floor, John F. Kennedy Medical Center, Monrovia, Liberia
                Author notes
                Corresponding author: Stephen Kennedy, kennedy@ 123456ul-pireafrica.org
                Author information
                http://orcid.org/0000-0001-7730-3753
                Article
                AJLM-5-509
                10.4102/ajlm.v5i3.509
                5433816
                28879143
                6a405651-197d-4e99-a84e-92623b8d6ea9
                © 2016. The Authors

                Licensee: AOSIS. This work is licensed under the Creative Commons Attribution License.

                History
                : 20 June 2016
                : 15 August 2016
                Categories
                Lessons from the Field

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