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Barbosa LRA, da Silva EL, de Almeida ACG, Salazar YEAR, Siqueira AM, Alecrim MDGC, Vieira JLF, Bassat Q, de Lacerda MVG, Monteiro WM, Melo GC. An Ultra-Sensitive Technique: Using Pv-mtCOX1 qPCR to Detect Early Recurrences of Plasmodium vivax in Patients in the Brazilian Amazon. Pathogens 2020; 10:pathogens10010019. [PMID: 33396824 PMCID: PMC7823330 DOI: 10.3390/pathogens10010019] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/13/2020] [Revised: 12/23/2020] [Accepted: 12/24/2020] [Indexed: 11/16/2022] Open
Abstract
BACKGROUND Early recurrence of Plasmodium vivax is a challenge for malaria control in the field, particularly because this species is associated with lower parasitemia, which hinders diagnosis and monitoring through blood smear testing. Early recurrences, defined as the persistence of parasites in the peripheral blood despite adequate drug dosages, may arise from resistance to chloroquine. The objective of the study was to estimate early recurrence of P. vivax in the Brazilian Amazon by using a highly-sensitive detection method, in this case, PCR. METHODS An ultra-sensitive qPCR that targeted mitochondrial DNA was used to compare a standard qPCR that targeted 18S rDNA to detect early recurrence of P. vivax in very low densities in samples from patients treated with chloroquine. RESULTS Out of a total of 312 cases, 29 samples (9.3%) were characterized as recurrences, from which 3.2% (10/312) were only detected through ultra-sensitive qPCR testing. CONCLUSIONS Studies that report the detection of P. vivax early recurrences using light microscopy may severely underestimate their true incidence.
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Affiliation(s)
- Laila R. A. Barbosa
- Fundação de Medicina Tropical Dr. Heitor Vieira Dourado, Instituto de Pesquisa Clínica Carlos Borborema, Manaus 69040-200, AM, Brazil; (L.R.A.B.); (E.L.d.S.); (A.C.G.d.A.); (Y.E.A.R.S.); (M.d.G.C.A.); (M.V.G.d.L.); (W.M.M.)
- Programa de Pós-Graduação em Medicina Tropical, Universidade do Estado do Amazonas, Manaus 69040-200, AM, Brazil
| | - Emanuelle L. da Silva
- Fundação de Medicina Tropical Dr. Heitor Vieira Dourado, Instituto de Pesquisa Clínica Carlos Borborema, Manaus 69040-200, AM, Brazil; (L.R.A.B.); (E.L.d.S.); (A.C.G.d.A.); (Y.E.A.R.S.); (M.d.G.C.A.); (M.V.G.d.L.); (W.M.M.)
- UNINILTONLINS—Universidade Nilton Lins, Unicenter, Manaus 69058-030, AM, Brazil
| | - Anne C. G. de Almeida
- Fundação de Medicina Tropical Dr. Heitor Vieira Dourado, Instituto de Pesquisa Clínica Carlos Borborema, Manaus 69040-200, AM, Brazil; (L.R.A.B.); (E.L.d.S.); (A.C.G.d.A.); (Y.E.A.R.S.); (M.d.G.C.A.); (M.V.G.d.L.); (W.M.M.)
- Programa de Pós-Graduação em Medicina Tropical, Universidade do Estado do Amazonas, Manaus 69040-200, AM, Brazil
- FAMETRO—Faculdade Metropolitana de Manaus, Campus Central, Av. Constantino Nery, Chapada, Manaus 69050-000, AM, Brazil
| | - Yanka E. A. R. Salazar
- Fundação de Medicina Tropical Dr. Heitor Vieira Dourado, Instituto de Pesquisa Clínica Carlos Borborema, Manaus 69040-200, AM, Brazil; (L.R.A.B.); (E.L.d.S.); (A.C.G.d.A.); (Y.E.A.R.S.); (M.d.G.C.A.); (M.V.G.d.L.); (W.M.M.)
| | - André M. Siqueira
- Fiocruz-Manguinhos—Fundação Oswaldo Cruz, Instituto de Pesquisa Clínica Evandro Chagas, Rio de Janeiro 21040-900, RJ, Brazil;
| | - Maria das Graças Costa Alecrim
- Fundação de Medicina Tropical Dr. Heitor Vieira Dourado, Instituto de Pesquisa Clínica Carlos Borborema, Manaus 69040-200, AM, Brazil; (L.R.A.B.); (E.L.d.S.); (A.C.G.d.A.); (Y.E.A.R.S.); (M.d.G.C.A.); (M.V.G.d.L.); (W.M.M.)
- Programa de Pós-Graduação em Medicina Tropical, Universidade do Estado do Amazonas, Manaus 69040-200, AM, Brazil
| | | | - Quique Bassat
- ISGlobal, Hospital Clínic, Universitat de Barcelona, 08036 Barcelona, Spain;
- Centro de Investigação em Saúde de Manhiça (CISM), Fundação Clínic per la Recerca Biomédica, Maputo 1929, Mozambique
- Catalan Institution for Research and Advanced Studies (ICREA), Campus Clínic, Pg. Lluís Companys 23, 08010 Barcelona, Spain
- Pediatric Infectious Diseases Unit, Pediatrics Department, Hospital Sant Joan de Déu, University of Barcelona, 1867 Barcelona, Spain
- Consorcio de Investigación Biomédica en Red de Epidemiología y Salud Pública (CIBERESP), 28029 Madrid, Spain
| | - Marcus V. G. de Lacerda
- Fundação de Medicina Tropical Dr. Heitor Vieira Dourado, Instituto de Pesquisa Clínica Carlos Borborema, Manaus 69040-200, AM, Brazil; (L.R.A.B.); (E.L.d.S.); (A.C.G.d.A.); (Y.E.A.R.S.); (M.d.G.C.A.); (M.V.G.d.L.); (W.M.M.)
- Programa de Pós-Graduação em Medicina Tropical, Universidade do Estado do Amazonas, Manaus 69040-200, AM, Brazil
- Instituto Leônidas & Maria Deane, ILMD-Fiocruz-Fundação Oswaldo Cruz, Manaus 69057-070, AM, Brazil
| | - Wuelton M. Monteiro
- Fundação de Medicina Tropical Dr. Heitor Vieira Dourado, Instituto de Pesquisa Clínica Carlos Borborema, Manaus 69040-200, AM, Brazil; (L.R.A.B.); (E.L.d.S.); (A.C.G.d.A.); (Y.E.A.R.S.); (M.d.G.C.A.); (M.V.G.d.L.); (W.M.M.)
- Programa de Pós-Graduação em Medicina Tropical, Universidade do Estado do Amazonas, Manaus 69040-200, AM, Brazil
| | - Gisely C. Melo
- Fundação de Medicina Tropical Dr. Heitor Vieira Dourado, Instituto de Pesquisa Clínica Carlos Borborema, Manaus 69040-200, AM, Brazil; (L.R.A.B.); (E.L.d.S.); (A.C.G.d.A.); (Y.E.A.R.S.); (M.d.G.C.A.); (M.V.G.d.L.); (W.M.M.)
- Programa de Pós-Graduação em Medicina Tropical, Universidade do Estado do Amazonas, Manaus 69040-200, AM, Brazil
- Correspondence: ; Tel.: +55-92-99159-8604
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3
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Hossain MS, Commons RJ, Douglas NM, Thriemer K, Alemayehu BH, Amaratunga C, Anvikar AR, Ashley EA, Asih PBS, Carrara VI, Lon C, D’Alessandro U, Davis TME, Dondorp AM, Edstein MD, Fairhurst RM, Ferreira MU, Hwang J, Janssens B, Karunajeewa H, Kiechel JR, Ladeia-Andrade S, Laman M, Mayxay M, McGready R, Moore BR, Mueller I, Newton PN, Thuy-Nhien NT, Noedl H, Nosten F, Phyo AP, Poespoprodjo JR, Saunders DL, Smithuis F, Spring MD, Stepniewska K, Suon S, Suputtamongkol Y, Syafruddin D, Tran HT, Valecha N, Van Herp M, Van Vugt M, White NJ, Guerin PJ, Simpson JA, Price RN. The risk of Plasmodium vivax parasitaemia after P. falciparum malaria: An individual patient data meta-analysis from the WorldWide Antimalarial Resistance Network. PLoS Med 2020; 17:e1003393. [PMID: 33211712 PMCID: PMC7676739 DOI: 10.1371/journal.pmed.1003393] [Citation(s) in RCA: 23] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/28/2020] [Accepted: 09/25/2020] [Indexed: 01/13/2023] Open
Abstract
BACKGROUND There is a high risk of Plasmodium vivax parasitaemia following treatment of falciparum malaria. Our study aimed to quantify this risk and the associated determinants using an individual patient data meta-analysis in order to identify populations in which a policy of universal radical cure, combining artemisinin-based combination therapy (ACT) with a hypnozoitocidal antimalarial drug, would be beneficial. METHODS AND FINDINGS A systematic review of Medline, Embase, Web of Science, and the Cochrane Database of Systematic Reviews identified efficacy studies of uncomplicated falciparum malaria treated with ACT that were undertaken in regions coendemic for P. vivax between 1 January 1960 and 5 January 2018. Data from eligible studies were pooled using standardised methodology. The risk of P. vivax parasitaemia at days 42 and 63 and associated risk factors were investigated by multivariable Cox regression analyses. Study quality was assessed using a tool developed by the Joanna Briggs Institute. The study was registered in the International Prospective Register of Systematic Reviews (PROSPERO: CRD42018097400). In total, 42 studies enrolling 15,341 patients were included in the analysis, including 30 randomised controlled trials and 12 cohort studies. Overall, 14,146 (92.2%) patients had P. falciparum monoinfection and 1,195 (7.8%) mixed infection with P. falciparum and P. vivax. The median age was 17.0 years (interquartile range [IQR] = 9.0-29.0 years; range = 0-80 years), with 1,584 (10.3%) patients younger than 5 years. 2,711 (17.7%) patients were treated with artemether-lumefantrine (AL, 13 studies), 651 (4.2%) with artesunate-amodiaquine (AA, 6 studies), 7,340 (47.8%) with artesunate-mefloquine (AM, 25 studies), and 4,639 (30.2%) with dihydroartemisinin-piperaquine (DP, 16 studies). 14,537 patients (94.8%) were enrolled from the Asia-Pacific region, 684 (4.5%) from the Americas, and 120 (0.8%) from Africa. At day 42, the cumulative risk of vivax parasitaemia following treatment of P. falciparum was 31.1% (95% CI 28.9-33.4) after AL, 14.1% (95% CI 10.8-18.3) after AA, 7.4% (95% CI 6.7-8.1) after AM, and 4.5% (95% CI 3.9-5.3) after DP. By day 63, the risks had risen to 39.9% (95% CI 36.6-43.3), 42.4% (95% CI 34.7-51.2), 22.8% (95% CI 21.2-24.4), and 12.8% (95% CI 11.4-14.5), respectively. In multivariable analyses, the highest rate of P. vivax parasitaemia over 42 days of follow-up was in patients residing in areas of short relapse periodicity (adjusted hazard ratio [AHR] = 6.2, 95% CI 2.0-19.5; p = 0.002); patients treated with AL (AHR = 6.2, 95% CI 4.6-8.5; p < 0.001), AA (AHR = 2.3, 95% CI 1.4-3.7; p = 0.001), or AM (AHR = 1.4, 95% CI 1.0-1.9; p = 0.028) compared with DP; and patients who did not clear their initial parasitaemia within 2 days (AHR = 1.8, 95% CI 1.4-2.3; p < 0.001). The analysis was limited by heterogeneity between study populations and lack of data from very low transmission settings. Study quality was high. CONCLUSIONS In this meta-analysis, we found a high risk of P. vivax parasitaemia after treatment of P. falciparum malaria that varied significantly between studies. These P. vivax infections are likely attributable to relapses that could be prevented with radical cure including a hypnozoitocidal agent; however, the benefits of such a novel strategy will vary considerably between geographical areas.
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Affiliation(s)
- Mohammad S. Hossain
- WorldWide Antimalarial Resistance Network (WWARN), Oxford, United Kingdom
- Global Health Division, Menzies School of Health Research and Charles Darwin University, Darwin, Australia
- Centre for Epidemiology and Biostatistics, Melbourne School of Population and Global Health, The University of Melbourne, Melbourne, Victoria, Australia
- International Centre for Diarrheal Diseases and Research, Bangladesh (icddr,b), Dhaka, Bangladesh
| | - Robert J. Commons
- WorldWide Antimalarial Resistance Network (WWARN), Oxford, United Kingdom
- Global Health Division, Menzies School of Health Research and Charles Darwin University, Darwin, Australia
- Internal Medical Services, Ballarat Health Services, Ballarat, Victoria, Australia
| | - Nicholas M. Douglas
- Global Health Division, Menzies School of Health Research and Charles Darwin University, Darwin, Australia
- Centre for Epidemiology and Biostatistics, Melbourne School of Population and Global Health, The University of Melbourne, Melbourne, Victoria, Australia
| | - Kamala Thriemer
- Global Health Division, Menzies School of Health Research and Charles Darwin University, Darwin, Australia
| | - Bereket H. Alemayehu
- ICAP at Mailman School of Public Health, Columbia University, New York, New York, United States of America
| | - Chanaki Amaratunga
- Laboratory of Malaria and Vector Research, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Rockville, Maryland, United States of America
| | | | - Elizabeth A. Ashley
- Centre for Tropical Medicine and Global Health, Nuffield Department of Clinical Medicine, University of Oxford, Oxford, United Kingdom
- Lao-Oxford-Mahosot Hospital-Wellcome Trust Research Unit (LOMWRU), Microbiology Laboratory, Mahosot Hospital, Vientiane, Lao PDR
| | | | - Verena I. Carrara
- Centre for Tropical Medicine and Global Health, Nuffield Department of Clinical Medicine, University of Oxford, Oxford, United Kingdom
- Shoklo Malaria Research Unit, Mahidol-Oxford Tropical Medicine Research Unit, Faculty of Tropical Medicine, Mahidol University, Mae Sot, Thailand
| | - Chanthap Lon
- Department of Bacterial and Parasitic Diseases, Armed Forces Research Institute of Medical Sciences (AFRIMS), Bangkok, Thailand
- Armed Forces Research Institute of Medical Sciences, Phnom Penh, Cambodia
| | | | - Timothy M. E. Davis
- Medical School, University of Western Australia, Fremantle Hospital, Fremantle, Australia
| | - Arjen M. Dondorp
- Centre for Tropical Medicine and Global Health, Nuffield Department of Clinical Medicine, University of Oxford, Oxford, United Kingdom
- Mahidol-Oxford Tropical Medicine Research Unit, Faculty of Tropical Medicine, Mahidol University, Bangkok, Thailand
| | - Michael D. Edstein
- Australian Defence Force Malaria and Infectious Disease Institute, Enoggera, Brisbane, Australia
| | - Rick M. Fairhurst
- Laboratory of Malaria and Vector Research, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Rockville, Maryland, United States of America
| | - Marcelo U. Ferreira
- Department of Parasitology, Institute of Biomedical Sciences, University of São Paulo, São Paulo, Brazil
| | - Jimee Hwang
- US President's Malaria Initiative, Malaria Branch, US Centers for Disease Control and Prevention, Atlanta, Georgia, United States of America
- Global Health Group, University of California San Francisco, San Francisco, California, United States of America
| | | | - Harin Karunajeewa
- Melbourne Medical School–Western Health, The University of Melbourne, Melbourne, Australia
- Western Health Chronic Disease Alliance, Sunshine Hospital, St Albans, Melbourne, Australia
| | - Jean R. Kiechel
- Drugs for Neglected Diseases initiative (DNDi), Geneva, Switzerland
| | - Simone Ladeia-Andrade
- Laboratory of Parasitic Diseases, Oswaldo Cruz Institute/Oswaldo Cruz Foundation (Fiocruz), Rio de Janeiro, Brazil
- Amazonian Malaria Initiative/Amazon Network for the Surveillance of Antimalarial Drug Resistance, Ministry of Health of Brazil, Cruzeiro do Sul, Brazil
| | - Moses Laman
- Medical School, University of Western Australia, Fremantle Hospital, Fremantle, Australia
- Papua New Guinea Institute of Medical Research, Madang, Papua New Guinea
| | - Mayfong Mayxay
- Centre for Tropical Medicine and Global Health, Nuffield Department of Clinical Medicine, University of Oxford, Oxford, United Kingdom
- Lao-Oxford-Mahosot Hospital-Wellcome Trust Research Unit (LOMWRU), Microbiology Laboratory, Mahosot Hospital, Vientiane, Lao PDR
- Institute of Research and Education Development (IRED), University of Health Sciences, Ministry of Health, Vientiane, Lao PDR
| | - Rose McGready
- Centre for Tropical Medicine and Global Health, Nuffield Department of Clinical Medicine, University of Oxford, Oxford, United Kingdom
- Shoklo Malaria Research Unit, Mahidol-Oxford Tropical Medicine Research Unit, Faculty of Tropical Medicine, Mahidol University, Mae Sot, Thailand
| | - Brioni R. Moore
- Medical School, University of Western Australia, Fremantle Hospital, Fremantle, Australia
- School of Pharmacy and Biomedical Sciences, Curtin University, Perth, Australia
| | - Ivo Mueller
- Division of Population Health and Immunity, The Walter & Eliza Hall Institute of Medical Research, Melbourne, Australia
- Department of Medical Biology, University of Melbourne, Melbourne, Australia
- Parasites and Insect Vectors Department, Institut Pasteur, Paris, France
| | - Paul N. Newton
- Centre for Tropical Medicine and Global Health, Nuffield Department of Clinical Medicine, University of Oxford, Oxford, United Kingdom
- Lao-Oxford-Mahosot Hospital-Wellcome Trust Research Unit (LOMWRU), Microbiology Laboratory, Mahosot Hospital, Vientiane, Lao PDR
- Mahidol-Oxford Tropical Medicine Research Unit, Faculty of Tropical Medicine, Mahidol University, Bangkok, Thailand
| | | | - Harald Noedl
- MARIB—Malaria Research Initiative Bandarban, Vienna, Austria
| | - Francois Nosten
- Centre for Tropical Medicine and Global Health, Nuffield Department of Clinical Medicine, University of Oxford, Oxford, United Kingdom
- Shoklo Malaria Research Unit, Mahidol-Oxford Tropical Medicine Research Unit, Faculty of Tropical Medicine, Mahidol University, Mae Sot, Thailand
| | - Aung P. Phyo
- Shoklo Malaria Research Unit, Mahidol-Oxford Tropical Medicine Research Unit, Faculty of Tropical Medicine, Mahidol University, Mae Sot, Thailand
- Myanmar Oxford Clinical Research Unit, Yangon, Myanmar
| | - Jeanne R. Poespoprodjo
- Mimika District Hospital, Timika, Indonesia
- Timika Malaria Research Programme, Papuan Health and Community Development Foundation, Timika, Indonesia
- Paediatric Research Office, Department of Child Health, Faculty of Medicine, Public Health and Nursing, Universitas Gadjah Mada/Dr. Sardjito Hospital, Yogyakarta, Indonesia
| | - David L. Saunders
- Division of Medicine, United States Army Research Institute of Infectious Diseases, Ft. Detrick, Maryland, United States of America
| | - Frank Smithuis
- Centre for Tropical Medicine and Global Health, Nuffield Department of Clinical Medicine, University of Oxford, Oxford, United Kingdom
- Myanmar Oxford Clinical Research Unit, Yangon, Myanmar
- Medical Action Myanmar, Yangon, Myanmar
| | - Michele D. Spring
- Department of Bacterial and Parasitic Diseases, Armed Forces Research Institute of Medical Sciences (AFRIMS), Bangkok, Thailand
| | - Kasia Stepniewska
- WorldWide Antimalarial Resistance Network (WWARN), Oxford, United Kingdom
- Centre for Tropical Medicine and Global Health, Nuffield Department of Clinical Medicine, University of Oxford, Oxford, United Kingdom
| | - Seila Suon
- National Center for Parasitology, Entomology, and Malaria Control, Phnom Penh, Cambodia
| | - Yupin Suputtamongkol
- Department of Medicine, Faculty of Medicine Siriraj Hospital, Mahidol University, Bangkok, Thailand
| | - Din Syafruddin
- Eijkman Institute for Molecular Biology, Jakarta, Indonesia
- Department of Parasitology, Faculty of Medicine, Hasanuddin University, Makassar, Indonesia
| | - Hien T. Tran
- Centre for Tropical Medicine and Global Health, Nuffield Department of Clinical Medicine, University of Oxford, Oxford, United Kingdom
- Oxford University Clinical Research Unit (OUCRU), Ho Chi Minh City, Vietnam
| | - Neena Valecha
- National Institute of Malaria Research, Dwarka, New Delhi, India
| | | | - Michele Van Vugt
- Shoklo Malaria Research Unit, Mahidol-Oxford Tropical Medicine Research Unit, Faculty of Tropical Medicine, Mahidol University, Mae Sot, Thailand
- Mahidol-Oxford Tropical Medicine Research Unit, Faculty of Tropical Medicine, Mahidol University, Bangkok, Thailand
- Academic Medical Centre, Department of Internal Medicine, Slotervaart Hospital, Amsterdam, The Netherlands
| | - Nicholas J. White
- Centre for Tropical Medicine and Global Health, Nuffield Department of Clinical Medicine, University of Oxford, Oxford, United Kingdom
- Mahidol-Oxford Tropical Medicine Research Unit, Faculty of Tropical Medicine, Mahidol University, Bangkok, Thailand
| | - Philippe J. Guerin
- WorldWide Antimalarial Resistance Network (WWARN), Oxford, United Kingdom
- Centre for Tropical Medicine and Global Health, Nuffield Department of Clinical Medicine, University of Oxford, Oxford, United Kingdom
| | - Julie A. Simpson
- WorldWide Antimalarial Resistance Network (WWARN), Oxford, United Kingdom
- Centre for Epidemiology and Biostatistics, Melbourne School of Population and Global Health, The University of Melbourne, Melbourne, Victoria, Australia
| | - Ric N. Price
- WorldWide Antimalarial Resistance Network (WWARN), Oxford, United Kingdom
- Global Health Division, Menzies School of Health Research and Charles Darwin University, Darwin, Australia
- Centre for Tropical Medicine and Global Health, Nuffield Department of Clinical Medicine, University of Oxford, Oxford, United Kingdom
- Mahidol-Oxford Tropical Medicine Research Unit, Faculty of Tropical Medicine, Mahidol University, Bangkok, Thailand
- * E-mail:
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4
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Phommasone K, van Leth F, Imwong M, Henriques G, Pongvongsa T, Adhikari B, Peto TJ, Promnarate C, Dhorda M, Sirithiranont P, Mukaka M, Peerawaranun P, Day NPJ, Cobelens F, Dondorp AM, Newton PN, White NJ, von Seidlein L, Mayxay M. Correction to: The use of ultrasensitive quantitative-PCR to assess the impact of primaquine on asymptomatic relapse of Plasmodium vivax infections: a randomized, controlled trial in Lao PDR. Malar J 2020; 19:32. [PMID: 31964377 PMCID: PMC6971976 DOI: 10.1186/s12936-020-3124-0] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022] Open
Affiliation(s)
- Koukeo Phommasone
- Lao-Oxford-Mahosot Hospital-Wellcome Trust Research Unit (LOMWRU), Microbiology Laboratory, Mahosot Hospital, Vientiane, Lao PDR.,Department of Global Health, Amsterdam University Medical Centers, Location AMC, Amsterdam, The Netherlands.,Amsterdam Institute for Global Health & Development, Amsterdam, The Netherlands
| | - Frank van Leth
- Department of Global Health, Amsterdam University Medical Centers, Location AMC, Amsterdam, The Netherlands.,Amsterdam Institute for Global Health & Development, Amsterdam, The Netherlands
| | - Mallika Imwong
- Mahidol Oxford Research Unit, Mahidol University, Bangkok, Thailand.,Department of Molecular Tropical Medicine and Genetics, Faculty of Tropical Medicine, Mahidol University, Bangkok, Thailand
| | - Gisela Henriques
- Mahidol Oxford Research Unit, Mahidol University, Bangkok, Thailand
| | - Tiengkham Pongvongsa
- Savannakhet Provincial Health Department, Savannakhet, Savannakhet Province, Lao PDR
| | - Bipin Adhikari
- Mahidol Oxford Research Unit, Mahidol University, Bangkok, Thailand.,Centre for Tropical Medicine and Global Health, Nuffield Department of Medicine, University of Oxford, Oxford, UK
| | - Thomas J Peto
- Mahidol Oxford Research Unit, Mahidol University, Bangkok, Thailand.,Centre for Tropical Medicine and Global Health, Nuffield Department of Medicine, University of Oxford, Oxford, UK
| | | | - Mehul Dhorda
- Mahidol Oxford Research Unit, Mahidol University, Bangkok, Thailand.,Centre for Tropical Medicine and Global Health, Nuffield Department of Medicine, University of Oxford, Oxford, UK.,WWARN Asia Regional Centre, Mahidol University, Bangkok, Thailand
| | | | - Mavuto Mukaka
- Mahidol Oxford Research Unit, Mahidol University, Bangkok, Thailand.,Centre for Tropical Medicine and Global Health, Nuffield Department of Medicine, University of Oxford, Oxford, UK
| | | | - Nicholas P J Day
- Mahidol Oxford Research Unit, Mahidol University, Bangkok, Thailand.,Centre for Tropical Medicine and Global Health, Nuffield Department of Medicine, University of Oxford, Oxford, UK
| | - Frank Cobelens
- Department of Global Health, Amsterdam University Medical Centers, Location AMC, Amsterdam, The Netherlands.,Amsterdam Institute for Global Health & Development, Amsterdam, The Netherlands
| | - Arjen M Dondorp
- Mahidol Oxford Research Unit, Mahidol University, Bangkok, Thailand.,Centre for Tropical Medicine and Global Health, Nuffield Department of Medicine, University of Oxford, Oxford, UK
| | - Paul N Newton
- Lao-Oxford-Mahosot Hospital-Wellcome Trust Research Unit (LOMWRU), Microbiology Laboratory, Mahosot Hospital, Vientiane, Lao PDR.,Centre for Tropical Medicine and Global Health, Nuffield Department of Medicine, University of Oxford, Oxford, UK
| | - Nicholas J White
- Mahidol Oxford Research Unit, Mahidol University, Bangkok, Thailand.,Centre for Tropical Medicine and Global Health, Nuffield Department of Medicine, University of Oxford, Oxford, UK
| | - Lorenz von Seidlein
- Mahidol Oxford Research Unit, Mahidol University, Bangkok, Thailand. .,Centre for Tropical Medicine and Global Health, Nuffield Department of Medicine, University of Oxford, Oxford, UK.
| | - Mayfong Mayxay
- Lao-Oxford-Mahosot Hospital-Wellcome Trust Research Unit (LOMWRU), Microbiology Laboratory, Mahosot Hospital, Vientiane, Lao PDR.,Institute of Research and Education Development, University of Health Sciences, Vientiane, Lao PDR
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