المؤلفون: Giang TV; Department of Viral and Parasitic Diseases, National Hospital for Tropical Diseases, Hanoi, VNM.; Department of Infectious Diseases, Hanoi Medical University, Hanoi, VNM., Hoa LNM; Department of Microbiology and Molecular Biology, National Hospital for Tropical Diseases, Hanoi, VNM., Hien TT; Department of Viral and Parasitic Diseases, National Hospital for Tropical Diseases, Hanoi, VNM., Cuong QD; Department of Viral and Parasitic Diseases, National Hospital for Tropical Diseases, Hanoi, VNM., Cap NT; Emergency Department, National Hospital for Tropical Diseases, Hanoi, VNM., Lam Vuong N; Department of Medical Statistics and Informatics, Faculty of Public Health, University of Medicine and Pharmacy at Ho Chi Minh City, Ho Chi Minh City, VNM., Thach PN; Emergency Department, National Hospital for Tropical Diseases, Hanoi, VNM.

المصدر: Cureus [Cureus] 2023 Jul 26; Vol. 15 (7), pp. e42484. Date of Electronic Publication: 2023 Jul 26 (Print Publication: 2023).

نوع المنشور: Journal Article

بيانات الدورية: Publisher: Cureus, Inc Country of Publication: United States NLM ID: 101596737 Publication Model: eCollection Cited Medium: Print ISSN: 2168-8184 (Print) Linking ISSN: 21688184 NLM ISO Abbreviation: Cureus Subsets: PubMed not MEDLINE

المؤلفون: Hoa LNM; Oxford University Clinical Research Unit and Wellcome Trust Major Overseas Programme, Hanoi, Viet Nam., Sullivan SG; WHO Collaborating Centre for Reference and Research on Influenza, Peter Doherty Institute for Infection and Immunity, Melbourne, Victoria, Australia.; Doherty Department, University of Melbourne, Peter Doherty Institute for Infection and Immunity, Melbourne, Victoria, Australia.; Fielding School of Public Health, University of California, Los Angeles, California, USA., Mai LQ; National Institute of Hygiene and Epidemiology, Hanoi, Viet Nam., Khvorov A; Doherty Department, University of Melbourne, Peter Doherty Institute for Infection and Immunity, Melbourne, Victoria, Australia., Phuong HVM; National Institute of Hygiene and Epidemiology, Hanoi, Viet Nam., Hang NLK; National Institute of Hygiene and Epidemiology, Hanoi, Viet Nam., Thai PQ; National Institute of Hygiene and Epidemiology, Hanoi, Viet Nam., Thanh LT; National Institute of Hygiene and Epidemiology, Hanoi, Viet Nam., Carolan L; WHO Collaborating Centre for Reference and Research on Influenza, Peter Doherty Institute for Infection and Immunity, Melbourne, Victoria, Australia., Anh DD; National Institute of Hygiene and Epidemiology, Hanoi, Viet Nam., Duong TN; National Institute of Hygiene and Epidemiology, Hanoi, Viet Nam., Bryant JE; Oxford University Clinical Research Unit and Wellcome Trust Major Overseas Programme, Hanoi, Viet Nam.; Center for Tropical Medicine and Global Health, Nuffield Department of Clinical Medicine, University of Oxford, Oxford, UK., van Doorn HR; Oxford University Clinical Research Unit and Wellcome Trust Major Overseas Programme, Hanoi, Viet Nam.; Center for Tropical Medicine and Global Health, Nuffield Department of Clinical Medicine, University of Oxford, Oxford, UK., Wertheim HFL; Oxford University Clinical Research Unit and Wellcome Trust Major Overseas Programme, Hanoi, Viet Nam.; Department of Medical Microbiology, Radboud University Medical Center, Nijmegen, Netherlands., Horby P; Oxford University Clinical Research Unit and Wellcome Trust Major Overseas Programme, Hanoi, Viet Nam.; Center for Tropical Medicine and Global Health, Nuffield Department of Clinical Medicine, University of Oxford, Oxford, UK., Fox A; Oxford University Clinical Research Unit and Wellcome Trust Major Overseas Programme, Hanoi, Viet Nam.; WHO Collaborating Centre for Reference and Research on Influenza, Peter Doherty Institute for Infection and Immunity, Melbourne, Victoria, Australia.; Department of Microbiology and Immunology, University of Melbourne, Peter Doherty Institute for Infection and Immunity, Melbourne, Victoria, Australia.

المصدر: The Journal of infectious diseases [J Infect Dis] 2022 Aug 12; Vol. 226 (1), pp. 59-69.

نوع المنشور: Journal Article; Research Support, Non-U.S. Gov't

بيانات الدورية: Publisher: Oxford University Press Country of Publication: United States NLM ID: 0413675 Publication Model: Print Cited Medium: Internet ISSN: 1537-6613 (Electronic) Linking ISSN: 00221899 NLM ISO Abbreviation: J Infect Dis Subsets: MEDLINE

مواضيع طبية MeSH: Influenza, Human*/epidemiology , Influenza A Virus, H1N1 Subtype* , Influenza Vaccines*, Humans ; Antibodies, Viral ; Influenza A Virus, H3N2 Subtype ; Hemagglutination Inhibition Tests

المؤلفون: Huy BV; Hanoi Medical University, Hanoi, Vietnam., Hoa LNM; National Hospital for Tropical Diseases, Hanoi, Vietnam., Thuy DT; National Hospital for Tropical Diseases, Hanoi, Vietnam., Van Kinh N; National Hospital for Tropical Diseases, Hanoi, Vietnam., Ngan TTD; Hanoi Medical University, Hanoi, Vietnam., Duyet LV; National Hospital for Tropical Diseases, Hanoi, Vietnam., Hung NT; Children's Hospital 1, Ho Chi Minh City, Vietnam., Minh NNQ; Children's Hospital 1, Ho Chi Minh City, Vietnam., Truong NT; Hospital for Tropical Disease, Ho Chi Minh City, Vietnam., Chau NVV; Hospital for Tropical Disease, Ho Chi Minh City, Vietnam.

المصدر: BioMed research international [Biomed Res Int] 2019 Nov 07; Vol. 2019, pp. 3085827. Date of Electronic Publication: 2019 Nov 07 (Print Publication: 2019).

نوع المنشور: Journal Article

بيانات الدورية: Publisher: Hindawi Pub. Co Country of Publication: United States NLM ID: 101600173 Publication Model: eCollection Cited Medium: Internet ISSN: 2314-6141 (Electronic) NLM ISO Abbreviation: Biomed Res Int Subsets: MEDLINE

مواضيع طبية MeSH: Disease Outbreaks*, Dengue/*diagnosis , Dengue/*epidemiology, Adolescent ; Adult ; Aged ; Aged, 80 and over ; Cross-Sectional Studies ; Dengue/physiopathology ; Dengue Virus/pathogenicity ; Female ; Hemorrhage/epidemiology ; Hospitalization ; Hospitals ; Humans ; Male ; Middle Aged ; Severe Dengue/diagnosis ; Severe Dengue/epidemiology ; Vietnam/epidemiology ; Young Adult

المؤلفون: Trung NV; National Hospital for Tropical Diseases, Hanoi, Vietnam.; Hanoi Medical University, Hanoi, Vietnam., Hoi LT; National Hospital for Tropical Diseases, Hanoi, Vietnam., Cuong DD; Bach Mai Hospital, Hanoi, Vietnam., Ha DT; Hanoi Medical University, Hanoi, Vietnam., Hoa TM; National Hospital for Tropical Diseases, Hanoi, Vietnam., Lien VN; National Hospital for Tropical Diseases, Hanoi, Vietnam., Hoa NT; National Hospital for Tropical Diseases, Hanoi, Vietnam., Hoa LNM; National Hospital for Tropical Diseases, Hanoi, Vietnam., Huong DT; National Hospital for Tropical Diseases, Hanoi, Vietnam., Bich VTN; Oxford University Clinical Research Unit, Wellcome Trust Asia Program, Hanoi, Vietnam., van Doorn HR; Oxford University Clinical Research Unit, Wellcome Trust Asia Program, Hanoi, Vietnam., Nadjm B; Oxford University Clinical Research Unit, Wellcome Trust Asia Program, Hanoi, Vietnam., Richards AL; Naval Medical Research Center, Silver Spring, Maryland, United States of America.; Uniformed Services University of the Health Sciences, Bethesda, Maryland, United States of America.

المصدر: PloS one [PLoS One] 2019 Aug 30; Vol. 14 (8), pp. e0221588. Date of Electronic Publication: 2019 Aug 30 (Print Publication: 2019).

نوع المنشور: Journal Article; Research Support, Non-U.S. Gov't; Research Support, U.S. Gov't, Non-P.H.S.

بيانات الدورية: Publisher: Public Library of Science Country of Publication: United States NLM ID: 101285081 Publication Model: eCollection Cited Medium: Internet ISSN: 1932-6203 (Electronic) Linking ISSN: 19326203 NLM ISO Abbreviation: PLoS One Subsets: MEDLINE

مواضيع طبية MeSH: Antigens, Bacterial/*genetics , Bacterial Proteins/*genetics , Orientia tsutsugamushi/*genetics , Scrub Typhus/*microbiology, Antigens, Bacterial/chemistry ; Antigens, Bacterial/immunology ; Bacterial Proteins/chemistry ; Bacterial Proteins/immunology ; Genotype ; High-Throughput Nucleotide Sequencing ; Humans ; Molecular Typing ; Molecular Weight ; Orientia tsutsugamushi/classification ; Orientia tsutsugamushi/immunology ; Phylogeny ; Phylogeography ; Prevalence ; Scrub Typhus/diagnosis ; Scrub Typhus/epidemiology ; Scrub Typhus/immunology ; Sequence Analysis, DNA ; Severity of Illness Index ; Vietnam

المؤلفون: Hoa LNM; Oxford University Clinical Research Unit, Hospital for Tropical Diseases, Vietnam., Tuan NA; Oxford University Clinical Research Unit, Hospital for Tropical Diseases, Vietnam., My PH; Oxford University Clinical Research Unit, Hospital for Tropical Diseases, Vietnam., Huong TTK; Oxford University Clinical Research Unit, Hospital for Tropical Diseases, Vietnam., Chi NTY; Oxford University Clinical Research Unit, Hospital for Tropical Diseases, Vietnam., Hau Thu TT; Oxford University Clinical Research Unit, Hospital for Tropical Diseases, Vietnam., Carrique-Mas J; Oxford University Clinical Research Unit, Hospital for Tropical Diseases, Vietnam., Duong MT; National Center for Veterinary Diagnostics, Hanoi, Vietnam., Tho ND; National Center for Veterinary Diagnostics, Hanoi, Vietnam., Hoang ND; National Center for Veterinary Diagnostics, Hanoi, Vietnam., Thanh TL; National Center for Veterinary Diagnostics, Hanoi, Vietnam., Diep NT; Department of Animal Health, Epidemiology Division, Hanoi, Vietnam., Duong NV; District Veterinary Services, BaVi District, Subdepartment of Animal Health, Hanoi province, Vietnam., Toan TK; Hanoi Medical University, Hanoi, Vietnam., Tung TS; Oxford University Clinical Research Unit, Hospital for Tropical Diseases, Vietnam.; National Institute Hygiene and Epidemiology, Hanoi, Vietnam., Mai LQ; National Institute Hygiene and Epidemiology, Hanoi, Vietnam., Iqbal M; The Pirbright Insitute, UK., Wertheim H; Oxford University Clinical Research Unit, Hospital for Tropical Diseases, Vietnam.; Radboud University, Nijmegen, Netherlands., van Doorn HR; Oxford University Clinical Research Unit, Hospital for Tropical Diseases, Vietnam.; Nuffield Department of Medicine, Centre for Tropical Medicine, University of Oxford, Oxford, UK., Bryant JE; Oxford University Clinical Research Unit, Hospital for Tropical Diseases, Vietnam.; Nuffield Department of Medicine, Centre for Tropical Medicine, University of Oxford, Oxford, UK., The Vizions Consortium

المصدر: The Journal of general virology [J Gen Virol] 2017 Aug; Vol. 98 (8), pp. 2011-2016. Date of Electronic Publication: 2017 Aug 04.

نوع المنشور: Journal Article

بيانات الدورية: Publisher: Microbiology Society Country of Publication: England NLM ID: 0077340 Publication Model: Print-Electronic Cited Medium: Internet ISSN: 1465-2099 (Electronic) Linking ISSN: 00221317 NLM ISO Abbreviation: J Gen Virol Subsets: MEDLINE

مواضيع طبية MeSH: Influenza A Virus, H9N2 Subtype/*isolation & purification , Influenza in Birds/*virology , Influenza, Human/*virology , Poultry Diseases/*virology, Adolescent ; Adult ; Aged ; Agriculture ; Animals ; Antibodies, Viral/blood ; Chickens ; Child ; Child, Preschool ; Ducks ; Female ; Humans ; Infant ; Influenza A Virus, H9N2 Subtype/classification ; Influenza A Virus, H9N2 Subtype/genetics ; Influenza A Virus, H9N2 Subtype/immunology ; Influenza in Birds/blood ; Influenza in Birds/epidemiology ; Influenza in Birds/transmission ; Influenza, Human/blood ; Influenza, Human/epidemiology ; Influenza, Human/transmission ; Male ; Middle Aged ; Poultry Diseases/blood ; Poultry Diseases/epidemiology ; Poultry Diseases/transmission ; Rural Population/statistics & numerical data ; Seroepidemiologic Studies ; Vietnam ; Young Adult

المؤلفون: Thuy DM; National Center for Veterinary Diagnostics, Department of Animal Health, Hanoi, Vietnam., Peacock TP; Avian Viral Diseases programme, The Pirbright Institute, Woking, UK; St Mary's Campus, Imperial College London, London, UK., Bich VTN; Oxford University Clinical Research Unit and Wellcome Trust Major Overseas Programme, Hanoi, Vietnam., Fabrizio T; St Jude's Center for Excellence in Influenza Research and Surveillance, Memphis, TN, USA., Hoang DN; Division of Epidemiology, Department of Animal Health, Hanoi, Vietnam., Tho ND; MIVEGEC (UM1-UM2-CNRS 5290-IRD 224), Centre de Recherche IRD, Montpellier, France., Diep NT; Division of Epidemiology, Department of Animal Health, Hanoi, Vietnam., Nguyen M; Oxford University Clinical Research Unit and Wellcome Trust Major Overseas Programme, Hanoi, Vietnam., Hoa LNM; Oxford University Clinical Research Unit and Wellcome Trust Major Overseas Programme, Hanoi, Vietnam., Trang HTT; Oxford University Clinical Research Unit and Wellcome Trust Major Overseas Programme, Hanoi, Vietnam., Choisy M; Oxford University Clinical Research Unit and Wellcome Trust Major Overseas Programme, Hanoi, Vietnam; MIVEGEC (UM1-UM2-CNRS 5290-IRD 224), Centre de Recherche IRD, Montpellier, France., Inui K; Food and Agriculture Organization of the United Nations, Hanoi, Vietnam., Newman S; Food and Agriculture Organization of the United Nations, Hanoi, Vietnam., Trung NV; National Hospital Tropical Diseases, Hanoi, Vietnam., van Doorn R; Oxford University Clinical Research Unit and Wellcome Trust Major Overseas Programme, Hanoi, Vietnam; Center for Tropical Medicine, Nuffield Department of Clinical Medicine, University of Oxford, Oxford, UK., To TL; National Center for Veterinary Diagnostics, Department of Animal Health, Hanoi, Vietnam., Iqbal M; Avian Viral Diseases programme, The Pirbright Institute, Woking, UK., Bryant JE; Oxford University Clinical Research Unit and Wellcome Trust Major Overseas Programme, Hanoi, Vietnam; Center for Tropical Medicine, Nuffield Department of Clinical Medicine, University of Oxford, Oxford, UK. Electronic address: jbryant@oucru.org.

المصدر: Infection, genetics and evolution : journal of molecular epidemiology and evolutionary genetics in infectious diseases [Infect Genet Evol] 2016 Oct; Vol. 44, pp. 530-540. Date of Electronic Publication: 2016 Jun 20.

نوع المنشور: Journal Article; Research Support, Non-U.S. Gov't

بيانات الدورية: Publisher: Elsevier Science Country of Publication: Netherlands NLM ID: 101084138 Publication Model: Print-Electronic Cited Medium: Internet ISSN: 1567-7257 (Electronic) Linking ISSN: 15671348 NLM ISO Abbreviation: Infect Genet Evol Subsets: MEDLINE

مواضيع طبية MeSH: Chickens/*virology , Influenza A Virus, H9N2 Subtype/*classification , Influenza A Virus, H9N2 Subtype/*genetics , Influenza in Birds/*epidemiology , Influenza in Birds/*virology, Animals ; Genome, Viral ; Genotype ; Hemagglutinin Glycoproteins, Influenza Virus/chemistry ; Hemagglutinin Glycoproteins, Influenza Virus/genetics ; High-Throughput Nucleotide Sequencing ; Models, Molecular ; Mutation ; Phylogeny ; Phylogeography ; Prevalence ; Protein Conformation ; Public Health Surveillance ; Vietnam/epidemiology

المؤلفون: Nguyen DNT; Oxford University Clinical Research Unit and Wellcome Trust Major Overseas Programme, Vietnam., Mai LQ; National Institute of Hygiene and Epidemiology, Hanoi, Vietnam., Bryant JE; Oxford University Clinical Research Unit and Wellcome Trust Major Overseas Programme, Vietnam; Center for Tropical Medicine, Nuffield Department of Clinical Medicine, University of Oxford, Oxford, UK., Hang NLK; National Institute of Hygiene and Epidemiology, Hanoi, Vietnam., Hoa LNM; Oxford University Clinical Research Unit and Wellcome Trust Major Overseas Programme, Vietnam., Nadjm B; Oxford University Clinical Research Unit and Wellcome Trust Major Overseas Programme, Vietnam; Center for Tropical Medicine, Nuffield Department of Clinical Medicine, University of Oxford, Oxford, UK., Thai PQ; National Institute of Hygiene and Epidemiology, Hanoi, Vietnam., Duong TN; National Institute of Hygiene and Epidemiology, Hanoi, Vietnam., Anh DD; National Institute of Hygiene and Epidemiology, Hanoi, Vietnam., Horby P; Oxford University Clinical Research Unit and Wellcome Trust Major Overseas Programme, Vietnam; Center for Tropical Medicine, Nuffield Department of Clinical Medicine, University of Oxford, Oxford, UK., van Doorn HR; Oxford University Clinical Research Unit and Wellcome Trust Major Overseas Programme, Vietnam; Center for Tropical Medicine, Nuffield Department of Clinical Medicine, University of Oxford, Oxford, UK., Wertheim HFL; Oxford University Clinical Research Unit and Wellcome Trust Major Overseas Programme, Vietnam; Department of Medical Microbiology, Radboudumc, Nijmegen, Netherlands., Fox A; Oxford University Clinical Research Unit and Wellcome Trust Major Overseas Programme, Vietnam; The University of Melbourne, Peter Doherty Institute for Infection and Immunity, Department of Microbiology and Immunology, Parkville, Victoria, Australia. Electronic address: annette.fox@unimelb.edu.au.

المصدر: Journal of clinical virology : the official publication of the Pan American Society for Clinical Virology [J Clin Virol] 2016 Sep; Vol. 82, pp. 126-132. Date of Electronic Publication: 2016 Jul 26.

نوع المنشور: Journal Article; Research Support, Non-U.S. Gov't

بيانات الدورية: Publisher: Elsevier Science Country of Publication: Netherlands NLM ID: 9815671 Publication Model: Print-Electronic Cited Medium: Internet ISSN: 1873-5967 (Electronic) Linking ISSN: 13866532 NLM ISO Abbreviation: J Clin Virol Subsets: MEDLINE

مواضيع طبية MeSH: Family Characteristics* , Family Health*, Respiratory Tract Infections/*epidemiology , Respiratory Tract Infections/*etiology , Virus Diseases/*epidemiology , Virus Diseases/*etiology , Viruses/*isolation & purification, Adolescent ; Adult ; Aged ; Aged, 80 and over ; Child ; Child, Preschool ; Female ; Humans ; Infant ; Infant, Newborn ; Male ; Middle Aged ; Multiplex Polymerase Chain Reaction ; Nasal Cavity/virology ; Pharynx/virology ; Real-Time Polymerase Chain Reaction ; Reverse Transcriptase Polymerase Chain Reaction ; Vietnam/epidemiology ; Viruses/classification ; Young Adult

المؤلفون: Hoa LNM; Oxford University Clinical Research Unit and Wellcome Trust Major Overseas Programme, Hanoi, Vietnam., Mai LQ; National Institute of Hygiene and Epidemiology, Hanoi, Vietnam., Bryant JE; Oxford University Clinical Research Unit and Wellcome Trust Major Overseas Programme, Hanoi, Vietnam.; Center for Tropical Medicine, Nuffield Department of Clinical Medicine, University of Oxford, Oxford, United Kingdom., Thai PQ; National Institute of Hygiene and Epidemiology, Hanoi, Vietnam., Hang NLK; National Institute of Hygiene and Epidemiology, Hanoi, Vietnam., Yen NTT; National Institute of Hygiene and Epidemiology, Hanoi, Vietnam., Duong TN; National Institute of Hygiene and Epidemiology, Hanoi, Vietnam., Thoang DD; Ha Nam Centre for Preventive Medicine, Ha Nam, Vietnam., Horby P; Oxford University Clinical Research Unit and Wellcome Trust Major Overseas Programme, Hanoi, Vietnam.; Center for Tropical Medicine, Nuffield Department of Clinical Medicine, University of Oxford, Oxford, United Kingdom., Werheim HFL; Oxford University Clinical Research Unit and Wellcome Trust Major Overseas Programme, Hanoi, Vietnam.; Center for Tropical Medicine, Nuffield Department of Clinical Medicine, University of Oxford, Oxford, United Kingdom.; Department of Medical Microbiology, Radboudumc, Nijmegen, Netherlands., Fox A; Oxford University Clinical Research Unit and Wellcome Trust Major Overseas Programme, Hanoi, Vietnam annette.fox@unimelb.edu.au.; The University of Melbourne, Peter Doherty Institute for Infection and Immunity, Department of Microbiology and Immunology, Parkville, Victoria, Australia.

المصدر: Journal of virology [J Virol] 2016 Jun 24; Vol. 90 (14), pp. 6549-6556. Date of Electronic Publication: 2016 Jun 24 (Print Publication: 2016).

نوع المنشور: Journal Article; Research Support, Non-U.S. Gov't

بيانات الدورية: Publisher: American Society For Microbiology Country of Publication: United States NLM ID: 0113724 Publication Model: Electronic-Print Cited Medium: Internet ISSN: 1098-5514 (Electronic) Linking ISSN: 0022538X NLM ISO Abbreviation: J Virol Subsets: MEDLINE

مواضيع طبية MeSH: Antibodies, Monoclonal/*immunology , Antibodies, Neutralizing/*blood , Antibodies, Viral/*blood , Hemagglutinin Glycoproteins, Influenza Virus/*immunology , Influenza A Virus, H1N1 Subtype/*immunology , Influenza, Human/*blood, Adolescent ; Adult ; Aged ; Aged, 80 and over ; Animals ; Child ; Child, Preschool ; Female ; Ferrets ; Hemagglutination Inhibition Tests ; Humans ; Infant ; Infant, Newborn ; Influenza, Human/epidemiology ; Influenza, Human/immunology ; Influenza, Human/virology ; Male ; Mice ; Middle Aged ; Pandemics ; Prospective Studies ; Time Factors ; Vietnam/epidemiology ; Young Adult

المؤلفون: Fox A, Whitehead S, Anders KL, Hoa LNM, Mai LQ, Thai PQ, Yen NT, Duong TN, Thoang DD, Farrar J, Wertheim H, Simmons C, Hien NT, Horby P

المصدر: The American journal of tropical medicine and hygiene [Am J Trop Med Hyg] 2014 May; Vol. 90 (5), pp. 892-896. Date of Electronic Publication: 2014 Mar 10.

نوع المنشور: Journal Article; Research Support, N.I.H., Intramural; Research Support, Non-U.S. Gov't

بيانات الدورية: Publisher: American Society of Tropical Medicine and Hygiene Country of Publication: United States NLM ID: 0370507 Publication Model: Print-Electronic Cited Medium: Internet ISSN: 1476-1645 (Electronic) Linking ISSN: 00029637 NLM ISO Abbreviation: Am J Trop Med Hyg Subsets: MEDLINE

مواضيع طبية MeSH: Dengue/*epidemiology , Dengue/*transmission , Encephalitis, Japanese/*epidemiology , Encephalitis, Japanese/*transmission, Antibodies, Viral/blood ; Dengue/diagnosis ; Encephalitis, Japanese/diagnosis ; Enzyme-Linked Immunosorbent Assay ; Humans ; Immunoglobulin G/blood ; Neutralization Tests ; Seroepidemiologic Studies ; Vaccination ; Vietnam/epidemiology