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John Nkengasong

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Kenneth N Ouma; TK Thomas; John Williamson; Sridhar V Basavaraju; Lisa A Mills; John N Nkengasong; Jully A Okonji; Clement Zeh
Evaluation of quantification of HIV-1 RNA viral load in plasma and dried blood spots by use of the semiautomated Cobas Amplicor assay and the fully automated Cobas Ampliprep/TaqMan assay, version 2.0, in Kisumu, Kenya.
Artur Ramos; Shambavi Subbarao; Albert Garcia; Shon Nguyen; John N Nkengasong; Dennis Ellenberger
Generation of dried tube specimen for HIV-1 viral load proficiency test panels: a cost-effective alternative for external quality assessment programs.
Jing Zhang; Zhenqiang Bi; Jihua Fu; Dianmin Kang; Bin Lin; John N Nkengasong; Xiaoguang Sun; Chunfu Yang
HIV type 1 virological response and prevalence of HIV type 1 drug resistance among patients receiving antiretroviral therapy, Shandong, China.

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2013: Kenneth N Ouma; TK Thomas; John Williamson; Sridhar V Basavaraju; Lisa A Mills; John N Nkengasong; Jully A Okonji; Clement Zeh
Evaluation of quantification of HIV-1 RNA viral load in plasma and dried blood spots by use of the semiautomated Cobas Amplicor assay and the fully automated Cobas Ampliprep/TaqMan assay, version 2.0, in Kisumu, Kenya.
Journal of clinical microbiology 2013;51(4):1208-18.
2013: Artur Ramos; Shambavi Subbarao; Albert Garcia; Shon Nguyen; John N Nkengasong; Dennis Ellenberger
Generation of dried tube specimen for HIV-1 viral load proficiency test panels: a cost-effective alternative for external quality assessment programs.
Journal of virological methods 2013;188(1-2):1-5.
2012: Jing Zhang; Zhenqiang Bi; Jihua Fu; Dianmin Kang; Bin Lin; John N Nkengasong; Xiaoguang Sun; Chunfu Yang
HIV type 1 virological response and prevalence of HIV type 1 drug resistance among patients receiving antiretroviral therapy, Shandong, China.
AIDS research and human retroviruses 2012;28(12):1658-65.
2012: Erin K Rottinghaus; Richard Ugbena; Guoqing Zhang; John Aberle-Grasse; Aderemi Azeez; Orji Bassey; Joshua Devos; Karidia Diallo; John N Nkengasong; Chunfu Yang
Dried blood spot specimens are a suitable alternative sample type for HIV-1 viral load measurement and drug resistance genotyping in patients receiving first-line antiretroviral therapy.
Clinical infectious diseases : an official publication of the Infectious Diseases Society of America 2012;54(8):1187-95.
2012: Peter N Fonjungo; Yenew Kebede; Almaz Abebe; Gonfa Ayana; Tsehaynesh Messele; John N Nkengasong; Gudeta Tibesso; Thomas Kenyon
Laboratory equipment maintenance: a critical bottleneck for strengthening health systems in sub-Saharan Africa?
Journal of public health policy 2012;33(1):34-45.
2012: George A Alemnji; Anton Best; Songee Branch; William Conn; Mireille Kalou; Eric Milstrey; John N Nkengasong; Bharat Parekh; Wanjiru Waruiru; Shirley Lecher
Strengthening national laboratory health systems in the Caribbean Region.
Global public health 2012;7(6):648-60.
2012: Yen T Duong; Keisha Jackson; Andrea A Kim; John N Nkengasong; Anindya K De; Trudy Dobbs; Maofeng Qiu; Bharat S Parekh
Detection of recent HIV-1 infection using a new limiting-antigen avidity assay: potential for HIV-1 incidence estimates and avidity maturation studies.
PloS one 2012;7(3):e33328.
2011: George A Alemnji; John N Nkengasong; Bharat S Parekh
HIV testing in developing countries: what is required?
The Indian journal of medical research 2011;134(6):779-86.
2011: Trudy Dobbs; Xin Liu; John N Nkengasong; Rebecca Anderson; Bharat S Parekh
A comprehensive evaluation of the proficiency testing program for the HIV-1 BED incidence assay.
Journal of clinical microbiology 2011;49(10):3470-3.
2011: Clement Zeh; Pauli N Amornkul; P Bondo; C Hart; A Kasembeli; K F Laserson; D Mwaengo; Pascale Ondoa; B Oyaro; TK Thomas; H Vandenhoudt; John N Nkengasong
Performance of six commercial enzyme immunoassays and two alternative HIV-testing algorithms for the diagnosis of HIV-1 infection in Kisumu, Western Kenya.
Journal of virological methods 2011;176(1-2):24-31.
2011: Clement Zeh; Paul J Weidle; Lillian Nafisa; Humphrey M Lwamba; Jully Okonji; Emily Anyango; Philip Bondo; Rose Masaba; Mary Glenn Fowler; John N Nkengasong; Michael C Thigpen; Timothy Thomas
HIV-1 drug resistance emergence among breastfeeding infants born to HIV-infected mothers during a single-arm trial of triple-antiretroviral prophylaxis for prevention of mother-to-child transmission: a secondary analysis.
PLoS medicine 2011;8(3):e1000430.
2011: Zhiyong Zhou; Isaac Zulu; Orji Bassey; Benson Chilima; Joshua R DeVos; Karidia Diallo; Michelle S McConnell; Duc B Nguyen; John N Nkengasong; Erin Rottinghaus; Richard Ugbena; Nellie Wadonda-Kabondo; Nick Wagar; Chunfu Yang
Optimization of a low cost and broadly sensitive genotyping assay for HIV-1 drug resistance surveillance and monitoring in resource-limited settings.
PloS one 2011;6(11):e28184.
2011: Wim Jennes; Sonja Verheyden; Christian Demanet; Joris Menten; Bea Vuylsteke; John N Nkengasong; Luc Kestens
Low CD4+ T cell counts among African HIV-1 infected subjects with group B KIR haplotypes in the absence of specific inhibitory KIR ligands.
PloS one 2011;6(2):e17043.
2010: Bharat S Parekh; Mireille B Kalou; George A Alemnji; Chin-Yih Ou; Guy-Michel Gershy-Damet; John N Nkengasong
Scaling up HIV rapid testing in developing countries: comprehensive approach for implementing quality assurance.
American journal of clinical pathology 2010;134(4):573-84.
2010: Clement E Zeh; Seth C Inzaule; Valentine O Magero; Timothy K Thomas; Kayla F Laserson; Clyde E Hart; John N Nkengasong
Field experience in implementing ISO 15189 in Kisumu, Kenya.
American journal of clinical pathology 2010;134(3):410-8.
2010: Katy Yao; Barbara McKinney; Anna Murphy; Phil Rotz; Winnie Wafula; Hakim Sendagire; Scolastica Okui; John N Nkengasong
Improving quality management systems of laboratories in developing countries: an innovative training approach to accelerate laboratory accreditation.
American journal of clinical pathology 2010;134(3):401-9.
2010: Guy-Michel Gershy-Damet; Philip Rotz; David Cross; El Hadj Belabbes; Fatim Cham; Jean-Bosco Ndihokubwayo; Glen Fine; Clement Zeh; Patrick A Njukeng; Souleymane MBoup; Daniel E Sesse; Tsehaynesh Messele; Deborah L Birx; John N Nkengasong
The World Health Organization African region laboratory accreditation process: improving the quality of laboratory systems in the African region.
American journal of clinical pathology 2010;134(3):393-400.
2010: Alex Opio; Winnie Wafula; Jackson Amone; Henry Kajumbula; John N Nkengasong
Country leadership and policy are critical factors for implementing laboratory accreditation in developing countries: a study on Uganda.
American journal of clinical pathology 2010;134(3):381-7.
2010: John N Nkengasong; Peter Nsubuga; Okey Nwanyanwu; Guy-Michel Gershy-Damet; Giorgio Roscigno; Marc Bulterys; Barry Schoub; Kevin M DeCock; Deborah Birx
Laboratory systems and services are critical in global health: time to end the neglect?
American journal of clinical pathology 2010;134(3):368-73.
2010: John N Nkengasong
A shifting paradigm in strengthening laboratory health systems for global health: acting now, acting collectively, but acting differently.
American journal of clinical pathology 2010;134(3):359-60.
2010: Chunfu Yang; Amanda McNulty; Karidia Diallo; Jing Zhang; Boghuma Titanji; Sidibe Kassim; Nellie Wadonda-Kabondo; John Aberle-Grasse; Tabitha Kibuka; Peter M Ndumbe; Shanmugam Vedapuri; Zhiyong Zhou; Benson Chilima; John N Nkengasong
Development and application of a broadly sensitive dried-blood-spot-based genotyping assay for global surveillance of HIV-1 drug resistance.
Journal of clinical microbiology 2010;48(9):3158-64.
2010: Bharat Parekh; Juliana Anyanwu; Hetal Patel; Marie Downer; Mireille Kalou; Catherine Gichimu; Bera Steven Keipkerich; Nelly Clement; Michael Omondi; Oren Mayer; Chin-Yih Ou; John N Nkengasong
Dried tube specimens: a simple and cost-effective method for preparation of HIV proficiency testing panels and quality control materials for use in resource-limited settings.
Journal of virological methods 2010;163(2):295-300.
2010: Peter Nsubuga; Okey Nwanyanwu; John N Nkengasong; David Mukanga; Murray Trostle
Strengthening public health surveillance and response using the health systems strengthening agenda in developing countries.
BMC public health 2010;10 Suppl 1():S5.
2010: Jing Zhang; Dianmin Kang; Jihua Fu; Xiaoguang Sun; Bin Lin; Zhenqiang Bi; John N Nkengasong; Chunfu Yang
Surveillance of transmitted HIV type 1 drug resistance in newly diagnosed hiv type 1-infected patients in Shandong Province, China.
AIDS research and human retroviruses 2010;26(1):99-103.
2010: Xierong Wei; Xin Liu; Trudy Dobbs; Debra Kuehl; John N Nkengasong; Dale J Hu; Bharat Parekh
Development of two avidity-based assays to detect recent HIV type 1 seroconversion using a multisubtype gp41 recombinant protein.
AIDS research and human retroviruses 2010;26(1):61-71.
2009: John N Nkengasong; Tsehaynesh Mesele; Sherry Orloff; Yenew Kebede; Peter N Fonjungo; Ralph Timperi; Deborah Birx
Critical role of developing national strategic plans as a guide to strengthen laboratory health systems in resource-poor settings.
American journal of clinical pathology 2009;131(6):852-7.
2009: Deborah Birx; Mark de Souza; John N Nkengasong
Laboratory challenges in the scaling up of HIV, TB, and malaria programs: The interaction of health and laboratory systems, clinical research, and service delivery.
American journal of clinical pathology 2009;131(6):849-51.
2009: John N Nkengasong
Strengthening laboratory services and systems in resource-poor countries.
American journal of clinical pathology 2009;131(6):774.
2009: Debra L Hanson; Christiane Adjé-Touré; N Talla-Nzussouo; Pascal Eby; Marie-Yolande Borget; Léonard Ya Kouadio; Bile Ebi Celestin; Odette Tossou; Serge Eholie; Auguste Kadio; Terence Chorba; John N Nkengasong
HIV type 1 drug resistance in adults receiving highly active antiretroviral therapy in Abidjan, Côte d'Ivoire.
AIDS research and human retroviruses 2009;25(5):489-95.
2009: Marie-Yolande Borget; Karidia Diallo; Christiane Adje-Toure; Terence Chorba; John N Nkengasong
Virologic and immunologic responses to antiretroviral therapy among HIV-1 and HIV-2 dually infected patients: case reports from Abidjan, Côte d'Ivoire.
Journal of clinical virology : the official publication of the Pan American Society for Clinical Virology 2009;45(1):72-5.
2009: Maofeng Qiu; Xin Liu; Yan Jiang; John N Nkengasong; Wenge Xing; Lijian Pei; Bharat Parekh
Current HIV-2 diagnostic strategy overestimates HIV-2 prevalence in China.
Journal of medical virology 2009;81(5):790-7.
2008: Geoffrey S Gottlieb; Serge-Paul Eholié; John N Nkengasong; Sabelle Jallow; Sarah Rowland-Jones; Hilton C Whittle; Papa Salif Sow
A call for randomized controlled trials of antiretroviral therapy for HIV-2 infection in West Africa.
AIDS (London, England) 2008;22(16):2069-72; discussion 2073-4.
2008: Michael Aidoo; Souleymane Sawadogo; E C Bile; Chunfu Yang; John N Nkengasong; Janet M McNicholl
Viral, HLA and T cell elements in cross-reactive immune responses to HIV-1 subtype A, CRF01_AE and CRF02_AG vaccine sequence in Ivorian blood donors.
Vaccine 2008;26(37):4830-9.
2008: Christiane Adjé-Touré; Debra L Hanson; N Talla-Nzussouo; Marie-Yolande Borget; Léonard Ya Kouadio; Odette Tossou; Patricia Fassinou; Emmanuel Bissagnene; Auguste Kadio; Monica L Nolan; John N Nkengasong
Virologic and immunologic response to antiretroviral therapy and predictors of HIV type 1 drug resistance in children receiving treatment in Abidjan, Côte d'Ivoire.
AIDS research and human retroviruses 2008;24(7):911-7.
2007: Tracy L Creek; Gayle G Sherman; John N Nkengasong; Lydia Lu; Thomas Finkbeiner; Mary Glenn Fowler; Emilia Rivadeneira; Nathan Shaffer
Infant human immunodeficiency virus diagnosis in resource-limited settings: issues, technologies, and country experiences.
American journal of obstetrics and gynecology 2007;197(3 Suppl):S64-71.
2007: Chin-Yih Ou; Hua Yang; Steven Balinandi; Souleymane Sawadogo; Vedapuri Shanmugam; Pius M Tih; Christiane Adje-Toure; Sam Tancho; Leonard Kouadio Ya; Marc Bulterys; Robert Downing; John N Nkengasong
Identification of HIV-1 infected infants and young children using real-time RT PCR and dried blood spots from Uganda and Cameroon.
Journal of virological methods 2007;144(1-2):109-14.
2006: Wim Jennes; Sonja Verheyden; Christian Demanet; Christiane Adjé-Touré; Bea Vuylsteke; John N Nkengasong; Luc Kestens
Cutting edge: resistance to HIV-1 infection among African female sex workers is associated with inhibitory KIR in the absence of their HLA ligands.
Journal of immunology (Baltimore, Md. : 1950) 2006;177(10):6588-92.
2006: Andre Tehe; Chantal Maurice; Debra L Hanson; Marie-Yolande Borget; Nadine Abiola; Matthieu Maran; Daniel Yavo; Zuzana Tomasik; Jürg Böni; Jörg Schüpbach; John N Nkengasong
Quantification of HIV-1 p24 by a highly improved ELISA: an alternative to HIV-1 RNA based treatment monitoring in patients from Abidjan, Côte d'Ivoire.
Journal of clinical virology : the official publication of the Pan American Society for Clinical Virology 2006;37(3):199-205.
2006: Wim Jennes; D Evertse; Marie-Yolande Borget; Bea Vuylsteke; Chantal Maurice; John N Nkengasong; Luc Kestens
Suppressed cellular alloimmune responses in HIV-exposed seronegative female sex workers.
Clinical and experimental immunology 2006;143(3):435-44.
2005: Thomas K Welty; Marc Bulterys; Edith R Welty; Pius M Tih; George Ndikintum; Godlove Nkuoh; Joseph Nkfusai; Janet Kayita; John N Nkengasong; Catherine M Wilfert
Integrating prevention of mother-to-child HIV transmission into routine antenatal care: the key to program expansion in Cameroon.
Journal of acquired immune deficiency syndromes (1999) 2005;40(4):486-93.
2005: Ann Chahroudi; Souleymane Sawadogo; Dennis Ellenberger; Danuta Pieniazek; Maire-Yolande Borget-Alloue; Michael Aidoo; Stephania Koblavi-Deme; Marcelo Fernandez-Vina; Chantal Maurice; Terence Chorba; John N Nkengasong; Janet M McNicholl
Measurement of HIV-1 CRF02_AG-specific T cell responses indicates the dominance of a p24gag epitope in blood donors in Abidjan, Cote d'Ivoire.
The Journal of infectious diseases 2005;192(8):1417-21.
2005: Thomas d'Aquin Toni; Christiane Adjé-Touré; Nicole Vidal; Albert Minga; Charlotte Huet; Marie-Yolande Borger; Patricia Recordon-Pinson; Bernard Masquelier; Monica Nolan; John N Nkengasong; Hervé J Fleury; Eric Delaporte; Martine Peeters
Presence of CRF09_cpx and complex CRF02_AG/CRF09_cpx recombinant HIV type 1 strains in Côte d'Ivoire, West Africa.
AIDS research and human retroviruses 2005;21(7):667-72.
2005: Pascale Ondoa; Stéphania Koblavi-Dème; Marie-Yolande Borget; Monica L Nolan; John N Nkengasong; Luc Kestens
Assessment of CD8 T cell immune activation markers to monitor response to antiretroviral therapy among HIV-1 infected patients in Côte d'Ivoire.
Clinical and experimental immunology 2005;140(1):138-48.
2005: Mireille Kalou; Madeleine Sassan-Morokro; Lucien Abouya; Célestin Bile; Chantal Maurice; Matthieu Maran; Odette Tossou; Thierry Roels; Alan E Greenberg; Stefan Z Wiktor; John N Nkengasong
Changes in HIV RNA viral load, CD4+ T-cell counts, and levels of immune activation markers associated with anti-tuberculosis therapy and cotrimoxazole prophylaxis among HIV-infected tuberculosis patients in Abidjan, Cote d'Ivoire.
Journal of medical virology 2005;75(2):202-8.
2005: Ebi C Bilé; Christiane Adjé-Touré; Marie-Yolande Borget; Mireille Kalou; Fabien Diomande; Terence Chorba; John N Nkengasong
Performance of drug-resistance genotypic assays among HIV-1 infected patients with predominantly CRF02_AG strains of HIV-1 in Abidjan, Cote d'Ivoire.
Journal of clinical virology : the official publication of the Pan American Society for Clinical Virology 2005;32(1):60-6.
2004: Danuta Pieniazek; Mark Rayfield; Dale J Hu; John N Nkengasong; Vincent Soriano; Walid Heneine; Clement Zeh; Simon M Agwale; Charles Wambebe; Lillian Odama; Stefan Z Wiktor
HIV-2 protease sequences of subtypes A and B harbor multiple mutations associated with protease inhibitor resistance in HIV-1.
AIDS (London, England) 2004;18(3):495-502.
2004: Stéphania Koblavi-Dème; Luc Kestens; Debra Hanson; Ron A Otten; Marie-Yolande Borget; Célestin E Bilé; Stefan Z Wiktor; Thierry Roels; Terence Chorba; John N Nkengasong
Differences in HIV-2 plasma viral load and immune activation in HIV-1 and HIV-2 dually infected persons and those infected with HIV-2 only in Abidjan, Côte D'Ivoire.
AIDS (London, England) 2004;18(3):413-9.
2004: Wim Jennes; Bea Vuylsteke; Marie-Yolande Borget; Virginie Traore-Ettiegne; Chantal Maurice; Monica Nolan; John N Nkengasong; Luc Kestens
HIV-specific T helper responses and frequency of exposure among HIV-exposed seronegative female sex workers in Abidjan, Cote d'Ivoire.
The Journal of infectious diseases 2004;189(4):602-10.
2004: Grace C John-Stewart; Dorothy Mbori-Ngacha; René-Anatole Ekpini; Edward janoff; John N Nkengasong; Jennifer S Read; Phillippe Van de Perre; Marie-Louise Newell
Breast-feeding and Transmission of HIV-1.
Journal of acquired immune deficiency syndromes (1999) 2004;35(2):196-202.
2004: John N Nkengasong; Christiane Adje-Toure; Paul J Weidle
HIV antiretroviral drug resistance in Africa.
AIDS reviews 2004;6(1):4-12.
2003: Martine Peeters; Coumba Toure-Kane; John N Nkengasong
Genetic diversity of HIV in Africa: impact on diagnosis, treatment, vaccine development and trials.
AIDS (London, England) 2003;17(18):2547-60.
2003: Denise J Jamieson; Toussaint S Sibailly; Ramses Sadek; Thierry Roels; Ehounou R Ekpini; Edith Boni-Ouattara; John M Karon; John N Nkengasong; Alan E Greenberg; Stefan Z Wiktor
HIV-1 viral load and other risk factors for mother-to-child transmission of HIV-1 in a breast-feeding population in Cote d'Ivoire.
Journal of acquired immune deficiency syndromes (1999) 2003;34(4):430-6.
2003: Christiane Adjé-Touré; Célestin E Bilé; Marie-Yolande Borget; Kurt Hertog; Chantal Maurice; Monica L Nolan; John N Nkengasong
Polymorphism in protease and reverse transcriptase and phenotypic drug resistance of HIV-1 recombinant CRF02_AG isolates from patients with no prior use of antiretroviral drugs in Abidjan, Côte d'Ivoire.
Journal of acquired immune deficiency syndromes (1999) 2003;34(1):111-3.
2003: Fabien V K Diomandé; Emmanuel Bissagnéné; John N Nkengasong; Chantal Maurice; Bondo Monga; Marie Laga; Monica L Nolan
The most efficient use of resources to identify those in need of antiretroviral treatment in Africa: empirical data from Côte d'Ivoire's Drug Access Initiative.
AIDS (London, England) 2003;17 Suppl 3():S87-93.
2003: Christiane Adjé-Touré; Rachanee Cheingsong; J Gerardo Garcìa-Lerma; Serge Eholié; Marie-Yolande Borget; Jean-Marc Bouchez; Ron A Otten; Chantal Maurice; Madeleine Sassan-Morokro; René E Ekpini; Monica Nolan; Terence Chorba; Walid Heneine; John N Nkengasong
Antiretroviral therapy in HIV-2-infected patients: changes in plasma viral load, CD4+ cell counts, and drug resistance profiles of patients treated in Abidjan, Côte d'Ivoire.
AIDS (London, England) 2003;17 Suppl 3():S49-54.
2003: Christiane Adjé-Touré; Bilé Celestin; Debra Hanson; Thierry Roels; Kurt Hertogs; Brendan Larder; Fabien Diomande; Martine Peeters; Serge Eholié; Eve M Lackritz; Terence Chorba; John N Nkengasong
Prevalence of genotypic and phenotypic HIV-1 drug-resistant strains among patients who have rebound in viral load while receiving antiretroviral therapy in the UNAIDS-Drug Access Initiative in Abidjan, Côte d'Ivoire.
AIDS (London, England) 2003;17 Suppl 3():S23-9.
2003: Stéphania Koblavi-Dème; Matthieu Maran; Nguessan Kabran; Marie-Yolande Borget; Mireille Kalou; Luc Kestens; Chantal Maurice; Madeleine Sassan-Morokro; Ehounou R Ekpini; Thierry Roels; Terence Chorba; John N Nkengasong
Changes in levels of immune activation and reconstitution markers among HIV-1-infected Africans receiving antiretroviral therapy.
AIDS (London, England) 2003;17 Suppl 3():S17-22.
2003: Gaston Djomand; Thierry Roels; Tedd Ellerbrock; Debra Hanson; Fabien Diomande; Bondo Monga; Chantal Maurice; John N Nkengasong; Regina Konan-Koko; Auguste Kadio; Stefan Z Wiktor; Eve M Lackritz; Joseph Saba; Terence Chorba
Virologic and immunologic outcomes and programmatic challenges of an antiretroviral treatment pilot project in Abidjan, Côte d'Ivoire.
AIDS (London, England) 2003;17 Suppl 3():S5-15.
2003: Souleymane Sawadogo; Christiane Adjé-Touré; Célestin E Bilé; René E Ekpini; Terence Chorba; John N Nkengasong
Field evaluation of the gag-based heteroduplex mobility assay for genetic subtyping of circulating recombinant forms of human immunodeficiency virus type 1 in Abidjan, Côte d'Ivoire.
Journal of clinical microbiology 2003;41(7):3056-9.
2003: Wim Jennes; Souleymane Sawadogo; Stéphania Koblavi-Dème; Bea Vuylsteke; Chantal Maurice; Thierry Roels; Terence Chorba; John N Nkengasong; Luc Kestens
Cellular human immunodeficiency virus (HIV)-protective factors: a comparison of HIV-exposed seronegative female sex workers and female blood donors in Abidjan, Côte d'Ivoire.
The Journal of infectious diseases 2003;187(2):206-14.
2002: Dennis Ellenberger; Bin Li; L Davis Lupo; Sherry Owen; John N Nkengasong; Madeleine Sassan Kadio-Morokro; James Smith; Harriet Robinson; Marta Ackers; Alan Greenberg; Thomas M Folks; Salvatore T Butera
Generation of a consensus sequence from prevalent and incident HIV-1 infections in West Africa to guide AIDS vaccine development.
Virology 2002;302(1):155-63.
2002: Paul J Weidle; Timothy Mastro; Alison D Grant; John N Nkengasong; Doris K Macharia
HIV/AIDS treatment and HIV vaccines for Africa.
Lancet 2002;359(9325):2261-7.
2002: Terence Chorba; John N Nkengasong; Thierry Roels; Bondo Monga; Chantal Maurice; Matthieu Maran; Gaston Djomand
Assessing eosinophil count as a marker of immune activation among human immunodeficiency virus-infected persons in sub-Saharan Africa.
Clinical infectious diseases : an official publication of the Infectious Diseases Society of America 2002;34(9):1264-6.
2002: Celine Montavon; Coumba Toure-Kane; John N Nkengasong; Laurence Vergne; Kurt Hertogs; Souleymane MBoup; Eric Delaporte; Martine Peeters
CRF06-cpx: a new circulating recombinant form of HIV-1 in West Africa involving subtypes A, G, K, and J.
Journal of acquired immune deficiency syndromes (1999) 2002;29(5):522-30.
2002: René-Anatole Ekpini; John N Nkengasong; Toussaint S Sibailly; Chantal Maurice; Christiane Adjé; Bondo Monga; Thierry Roels; Alan E Greenberg; Stefan Z Wiktor
Changes in plasma HIV-1-RNA viral load and CD4 cell counts, and lack of zidovudine resistance among pregnant women receiving short-course zidovudine.
AIDS (London, England) 2002;16(4):625-30.
2002: Peter N Fonjungo; Eitel N Mpoudi; Judith N Torimiro; George A Alemnji; Laura T Eno; Esther J Lyonga; John N Nkengasong; Renu B Lal; Mark Rayfield; Marcia L Kalish; Thomas M Folks; Danuta Pieniazek
Human immunodeficiency virus type 1 group m protease in cameroon: genetic diversity and protease inhibitor mutational features.
Journal of clinical microbiology 2002;40(3):837-45.
2002: Wim Jennes; Souleymane Sawadogo; Stéphania Koblavi-Dème; Bea Vuylsteke; Chantal Maurice; Thierry Roels; Terence Chorba; John N Nkengasong; Luc Kestens
Positive association between beta-chemokine-producing T cells and HIV type 1 viral load in HIV-infected subjects in Abidjan, Côte d'Ivoire.
AIDS research and human retroviruses 2002;18(3):171-7.
2001: Laurent Bélec; Peter D Ghys; Hakim Hocini; John N Nkengasong; J Tranchot-Diallo; Mamadou O Diallo; V Ettiègne-Traore; Chantal Maurice; Pierre Becquart; Mathieu Matta; Ali Si-Mohamed; Nicolas Chomont; Issouf Coulibaly; Stefan Z Wiktor; Michel D Kazatchkine
Cervicovaginal secretory antibodies to human immunodeficiency virus type 1 (HIV-1) that block viral transcytosis through tight epithelial barriers in highly exposed HIV-1-seronegative African women.
The Journal of infectious diseases 2001;184(11):1412-22.
2001: John N Nkengasong; Marie-Yolande Borget; Chantal Maurice; E Boateng; Mireille Kalou; Gaston Djomand; René-Anatole Ekpini; SP Eholie; E Bissagene; Mamadou B Coulibaly; Stefan Z Wiktor; Thierry Roels; Terence Chorba
Distribution of HIV-1 plasma RNA viral load and CD4 + T-cell counts among HIV-infected Africans evaluated for antiretroviral therapy.
Journal of acquired immune deficiency syndromes (1999) 2001;28(1):99-101.
2001: Christiane Adjé; Célestin E Bilé; Luc Kestens; S Koblavi-Deme; Peter D Ghys; Chantal Maurice; M Kalou-Badirou; N Kabran; René E Ekpini; Thierry Roels; Stefan Z Wiktor; John N Nkengasong
Lack of effect of chemokine receptor CCR2b gene polymorphism (64I) on HIV-1 plasma RNA viral load and immune activation among HIV-1 seropositive female workers in Abidjan, Côte d'Ivoire.
Journal of medical virology 2001;64(4):398-401.
2001: Stéphania Koblavi-Dème; Chantal Maurice; Daniel Yavo; Toussaint S Sibailly; K N'guessan; Y Kamelan-Tano; Stefan Z Wiktor; Thierry Roels; Terence Chorba; John N Nkengasong
Sensitivity and specificity of human immunodeficiency virus rapid serologic assays and testing algorithms in an antenatal clinic in Abidjan, Ivory Coast.
Journal of clinical microbiology 2001;39(5):1808-12.
2001: John N Nkengasong; Luc Kestens; Peter D Ghys; Stéphania Koblavi-Dème; Célestin E Bilé; Mireille Kalou; L K Ya; V Traoré-Ettiègne; Chantal Maurice; Marie Laga; Stefan Z Wiktor; Alan E Greenberg
Human immunodeficiency virus Type 1 (HIV-1) plasma virus load and markers of immune activation among HIV-infected female sex workers with sexually transmitted diseases in Abidjan, Côte d'Ivoire.
The Journal of infectious diseases 2001;183(9):1405-8.
2001: Christiane Adjé; Rachanee Cheingsong; Thierry Roels; Chantal Maurice; Gaston Djomand; Werner Verbiest; Kurt Hertogs; Brendan Larder; Bondo Monga; M Peeters; SP Eholie; E Bissagene; Mamadou B Coulibaly; Richard Respess; Stefan Z Wiktor; Terence Chorba; John N Nkengasong
High prevalence of genotypic and phenotypic HIV-1 drug-resistant strains among patients receiving antiretroviral therapy in Abidjan, Côte d'Ivoire.
Journal of acquired immune deficiency syndromes (1999) 2001;26(5):501-6.
2001: W H Koch; Sullivan Patrick; C Roberts; K Francis; Robert Downing; Timothy Mastro; John N Nkengasong; D Hu; Silvina Masciotra; CA Schable; Renu B Lal
Evaluation of United States-licensed human immunodeficiency virus immunoassays for detection of group M viral variants.
Journal of clinical microbiology 2001;39(3):1017-20.
2000: Peter D Ghys; Laurent Bélec; Mamadou O Diallo; Virginie Ettiègne-Traoré; Pierre Becquart; Chantal Maurice; John N Nkengasong; Issouf Coulibaly; Alan E Greenberg; Marie Laga; Stefan Z Wiktor
Cervicovaginal anti-HIV antibodies in HIV-seronegative female sex workers in Abidjan, Côte d'Ivoire.
AIDS (London, England) 2000;14(16):2603-8.
2000: John N Nkengasong; Luc Kestens; Peter D Ghys; Stéphania Koblavi-Dème; Ron A Otten; Célestin E Bilé; Chantal Maurice; Mireille Kalou; Marie Laga; Stefan Z Wiktor; Alan E Greenberg
Dual infection with human immunodeficiency virus type 1 and type 2: impact on HIV type 1 viral load and immune activation markers in HIV-seropositive female sex workers in Abidjan, Ivory Coast.
AIDS research and human retroviruses 2000;16(14):1371-8.
2000: Peter N Fonjungo; Eitel N Mpoudi; Judith N Torimiro; George A Alemnji; Laura T Eno; John N Nkengasong; Feng-Xiang Gao; Mark Rayfield; Thomas M Folks; Danuta Pieniazek; Renu B Lal
Presence of diverse human immunodeficiency virus type 1 viral variants in Cameroon.
AIDS research and human retroviruses 2000;16(13):1319-24.
2000: Danuta Pieniazek; Mark Rayfield; Dale J Hu; John N Nkengasong; Stefan Z Wiktor; Robert Downing; Benon Biryahwaho; Timothy Mastro; Amilcar Tanuri; Vincent Soriano; R Lal; Timothy J Dondero
Protease sequences from HIV-1 group M subtypes A-H reveal distinct amino acid mutation patterns associated with protease resistance in protease inhibitor-naive individuals worldwide. HIV Variant Working Group.
AIDS (London, England) 2000;14(11):1489-95.
2000: Vedapuri Shanmugam; William Switzer; John N Nkengasong; G García-Lerma; Timothy A Green; Ehounou R Ekpini; Madeleine Sassan-Morokro; F Antunes; K Manshino; Vincent Soriano; Stefan Z Wiktor; Walid Heneine
Lower HIV-2 plasma viral loads may explain differences between the natural histories of HIV-1 and HIV-2 infections.
Journal of acquired immune deficiency syndromes (1999) 2000;24(3):257-63.
2000: John N Nkengasong; Chi-Cheng Luo; Lucien Abouya; Danuta Pieniazek; Chantal Maurice; Madeleine Sassan-Morokro; Dennis Ellenberger; Dale J Hu; Chou-Pong Pau; Trudy Dobbs; Richard Respess; D Coulibaly; Issouf Coulibaly; Stefan Z Wiktor; Alan E Greenberg; Mark Rayfield
Distribution of HIV-1 subtypes among HIV-seropositive patients in the interior of Côte d'Ivoire.
Journal of acquired immune deficiency syndromes (1999) 2000;23(5):430-6.
2000: Peter N Fonjungo; BC Dash; Eitel N Mpoudi; Judith N Torimiro; George A Alemnji; Laura T Eno; John N Nkengasong; Mark Rayfield; Thomas M Folks; Danuta Pieniazek; Renu B Lal
Molecular screening for HIV-1 group N and simian immunodeficiency virus cpz-like virus infections in Cameroon.
AIDS (London, England) 2000;14(6):750-2.
2000: J Dorn; Silvina Masciotra; Chunfu Yang; Robert Downing; Benon Biryahwaho; Timothy Mastro; John N Nkengasong; Danuta Pieniazek; Mark Rayfield; Dale J Hu; Renu B Lal
Analysis of genetic variability within the immunodominant epitopes of envelope gp41 from human immunodeficiency virus type 1 (HIV-1) group M and its impact on HIV-1 antibody detection.
Journal of clinical microbiology 2000;38(2):773-80.
1999: Wouter Janssens; John N Nkengasong; Leo Heyndrickx; Gert Van der Auwera; Katleen Vereecken; Sandra Coppens; Betty Willems; Els Beirnaert; Katrien Fransen; M Peeters; Guido van der Groen
Intrapatient variability of HIV type 1 group O ANT70 during a 10-year follow-up.
AIDS research and human retroviruses 1999;15(15):1325-32.
1999: Chunfu Yang; Danuta Pieniazek; Sherry Owen; Carol Fridlund; John N Nkengasong; Timothy Mastro; Mark Rayfield; Robert Downing; B Biryawaho; Amilcar Tanuri; Leopold Zekeng; Guido van der Groen; F Gao; Renu B Lal
Detection of phylogenetically diverse human immunodeficiency virus type 1 groups M and O from plasma by using highly sensitive and specific generic primers.
Journal of clinical microbiology 1999;37(8):2581-6.
1999: Stefan Z Wiktor; John N Nkengasong; Ehounou R Ekpini; Adjorlolo-Johnson Georgette; Peter D Ghys; K Brattegaard; Odette Tossou; Timothy J Dondero; Kevin M De Cock; Alan E Greenberg
Lack of protection against HIV-1 infection among women with HIV-2 infection.
AIDS (London, England) 1999;13(6):695-9.
1999: Danuta Pieniazek; Dennis Ellenberger; LM Janini; A C Ramos; John N Nkengasong; Madeleine Sassan-Morokro; Dale J Hu; I M Coulibally; Ehounou R Ekpini; Claudiu Bandea; Amilcar Tanuri; Alan E Greenberg; Stefan Z Wiktor; Mark Rayfield
Predominance of human immunodeficiency virus type 2 subtype B in Abidjan, Ivory Coast.
AIDS research and human retroviruses 1999;15(6):603-8.
1999: John N Nkengasong; Célestin Bile; Mireille Kalou; Chantal Maurice; E Boateng; Madeleine Sassan-Morokro; Mark Rayfield; D Coulibaly; Alan E Greenberg; Stefan Z Wiktor
Quantification of RNA in HIV type 1 subtypes D and G by NucliSens and Amplicor assays in Abidjan, Ivory Coast.
AIDS research and human retroviruses 1999;15(6):495-8.
1999: Stefan Z Wiktor; Ehounou R Ekpini; John M Karon; John N Nkengasong; Chantal Maurice; ST Severin; Thierry Roels; M K Kouassi; Eve M Lackritz; Issouf Coulibaly; Alan E Greenberg
Short-course oral zidovudine for prevention of mother-to-child transmission of HIV-1 in Abidjan, Côte d'Ivoire: a randomised trial.
Lancet 1999;353(9155):781-5.
1999: John N Nkengasong; Chantal Maurice; S Koblavi; Mireille Kalou; Daniel Yavo; Matthieu Maran; Célestin Bile; K N'guessan; J Kouadio; S Bony; Stefan Z Wiktor; Alan E Greenberg
Evaluation of HIV serial and parallel serologic testing algorithms in Abidjan, Côte d'Ivoire.
AIDS (London, England) 1999;13(1):109-17.
1999: Wouter Janssens; Leo Heyndrickx; Gert Van der Auwera; John N Nkengasong; Els Beirnaert; Katleen Vereecken; Sandra Coppens; Betty Willems; Katrien Fransen; M Peeters; Peter Ndumbe; E Delaporte; Guido van der Groen
Interpatient genetic variability of HIV-1 group O.
AIDS (London, England) 1999;13(1):41-8.
1999: Dennis Ellenberger; Danuta Pieniazek; John N Nkengasong; Chi-Cheng Luo; Sushil G Devare; Chantal Maurice; M Janini; Artur Ramos; Carol Fridlund; Dale J Hu; Issouf Coulibaly; Ehounou R Ekpini; Stefan Z Wiktor; Alan E Greenberg; Gerald Schochetman; Mark Rayfield
Genetic analysis of human immunodeficiency virus in Abidjan, Ivory Coast reveals predominance of HIV type 1 subtype A and introduction of subtype G.
AIDS research and human retroviruses 1999;15(1):3-9.
1998: John N Nkengasong; Mireille Kalou; Chantal Maurice; Célestin Bile; Marie-Yolande Borget; S Koblavi; E Boateng; Madeleine Sassan-Morokro; E Anatole-Ehounou; Peter D Ghys; Alan E Greenberg; Stefan Z Wiktor
Comparison of NucliSens and Amplicor monitor assays for quantification of human immunodeficiency virus type 1 (HIV-1) RNA in plasma of persons with HIV-1 subtype A infection in Abidjan, Côte d'Ivoire.
Journal of clinical microbiology 1998;36(9):2495-8.
1998: John N Nkengasong; F Sylla-Koko; M Peeters; Dennis Ellenberger; Madeleine Sassan-Morokro; René-Anatole Ekpini; Philippe Msellati; Alan E Greenberg; Patrice Combe; Mark Rayfield
HIV-1 group O virus infection in Abidjan, Côte d'Ivoire.
AIDS (London, England) 1998;12(12):1565-6.
1998: Koichi Ishikawa; Katrien Fransen; K Ariyoshi; John N Nkengasong; Wouter Janssens; Leo Heyndrickx; H Whittle; Mamadou O Diallo; Peter D Ghys; Issouf Coulibaly; Alan E Greenberg; Joao Piedade; Wanda F Canas-Ferreira; Guido van der Groen
Improved detection of HIV-2 proviral DNA in dually seroreactive individuals by PCR.
AIDS (London, England) 1998;12(12):1419-25.
1998: John N Nkengasong; Betty Willems; Wouter Janssens; R Cheingsong-Popov; Leo Heyndrickx; Francis Barin; Pascale Ondoa; Katrien Fransen; J Goudsmit; Guido van der Groen
Lack of correlation between V3-loop peptide enzyme immunoassay serologic subtyping and genetic sequencing.
AIDS (London, England) 1998;12(12):1405-12.
1998: Pascale Ondoa; Betty Willems; Katrien Fransen; John N Nkengasong; Wouter Janssens; Leo Heyndrickx; Leopold Zekeng; Peter Ndumbe; F Simon; Sentob Saragosti; Lutz Gürtler; M Peeters; B Korber; J Goudsmit; Guido van der Groen
Evaluation of different V3 peptides in an enzyme immunoassay for specific HIV type 1 group O antibody detection.
AIDS research and human retroviruses 1998;14(11):963-72.
1998: François-Xavier Mbopi-Kéou; E Mpoudi-Ngollé; John N Nkengasong; Leopold Zekeng; Dora Mbanya; G Affana; Philippe Mauclère; M Monny Lobé; Jean-Baptiste Tapko; Peter Ndumbe; R Salla; Lazare Kaptué; Laurent Bélec
Trends of AIDS epidemic in Cameroon, 1986 through 1995.
Journal of acquired immune deficiency syndromes and human retrovirology : official publication of the International Retrovirology Association 1998;18(1):89-91.
1998: John N Nkengasong; Chantal Maurice; S Koblavi; Mireille Kalou; Célestin Bile; Daniel Yavo; E Boateng; Stefan Z Wiktor; Alan E Greenberg
Field evaluation of a combination of monospecific enzyme-linked immunosorbent assays for type-specific diagnosis of human immunodeficiency virus type 1 (HIV-1) and HIV-2 infections in HIV-seropositive persons in Abidjan, Ivory Coast.
Journal of clinical microbiology 1998;36(1):123-7.
1997: Katrien Fransen; G Mertens; D Stynen; A Goris; P Nys; John N Nkengasong; Leo Heyndrickx; Wouter Janssens; Guido van der Groen
Evaluation of a newly developed HIV antigen test.
Journal of medical virology 1997;53(1):31-5.
1997: E Karita; John N Nkengasong; Betty Willems; Guido Vanham; Katrien Fransen; Leo Heyndrickx; Wouter Janssens; Peter Piot; Guido van der Groen
Macrophage-tropism of HIV-1 isolates of different genetic subtypes.
AIDS (London, England) 1997;11(10):1303-4.
1997: John N Nkengasong; Katrien Fransen; Betty Willems; E Karita; Johan Vingerhoets; Luc Kestens; Robert Colebunders; Peter Piot; Guido van der Groen
Virologic, immunologic, and clinical follow-up of a couple infected by the human immunodeficiency virus type one, group O.
Journal of medical virology 1997;51(3):202-9.
1997: Phillipe N Nyambi; Betty Willems; Wouter Janssens; Katrien Fransen; John N Nkengasong; M Peeters; Katleen Vereecken; Leo Heyndrickx; Peter Piot; Guido van der Groen
The neutralization relationship of HIV type 1, HIV type 2, and SIVcpz is reflected in the genetic diversity that distinguishes them.
AIDS research and human retroviruses 1997;13(1):7-17.
1996: Phillipe N Nyambi; John N Nkengasong; Paul J Lewi; Koen Andries; Wouter Janssens; Katrien Fransen; Leo Heyndrickx; Peter Piot; Guido van der Groen
Multivariate analysis of human immunodeficiency virus type 1 neutralization data.
Journal of virology 1996;70(9):6235-43.
1996: Katrien Fransen; Anne Buvé; John N Nkengasong; Marie Laga; G van der Groen
Longstanding presence in Belgians of multiple non-B HIV-1 subtypes.
Lancet 1996;347(9012):1403.
1995: John N Nkengasong; M Peeters; P Zhong; Betty Willems; Wouter Janssens; Leo Heyndrickx; Katrien Fransen; Peter Ndumbe; Guy-Michel Gershy-Damet; P Nys
Biological phenotypes of HIV-1 subtypes A and B strains of diverse origins.
Journal of medical virology 1995;47(3):278-84.
1995: Phillipe N Nyambi; John N Nkengasong; M Peeters; F Simon; J Eberle; Wouter Janssens; Katrien Fransen; Betty Willems; Katleen Vereecken; Leo Heyndrickx
Reduced capacity of antibodies from patients infected with human immunodeficiency virus type 1 (HIV-1) group O to neutralize primary isolates of HIV-1 group M viruses.
The Journal of infectious diseases 1995;172(5):1228-37.
1995: Wouter Janssens; Katrien Fransen; I Loussert-Ajaka; Leo Heyndrickx; T Ivens; J Eberle; John N Nkengasong
Diagnosis of HIV-1 group O infection by polymerase chain reaction.
Lancet 1995;346(8972):451-2.
1995: John N Nkengasong; Phillipe N Nyambi; H Claeys; Hans De Beenhouwer; J P Collart; J Ayuk; Peter Ndumbe
Predominantly hepatitis C virus genotypes 1 and 2 are found in Cameroon.
The Journal of infectious diseases 1995;171(5):1380-1.
1995: J B Ndihokubwayo; John N Nkengasong; B Willems; B Poste; K Fransen; G Van der Groen
[Preliminary survey of human immunodeficiency virus 1, group O in Burundi].
Médecine tropicale : revue du Corps de santé colonial 1995;55(4):394.
1995: John N Nkengasong; M Peeters; P Nys; Betty Willems; Peter Piot; Guido van der Groen
Infectious virus titer, replicative and syncytium-inducing capacity of human immunodeficiency virus type 1.
Journal of medical virology 1995;45(1):78-81.
1995: M Peeters; V Lobe; John N Nkengasong; Betty Willems; M L Delforge; L Van Renterghem; H Revets; S Sprecher; Guido van der Groen
HIV-1 group O infection in Belgium.
Acta clinica Belgica 1995;50(3):171-3.
1995: John N Nkengasong; Hans De Beenhouwer; H Claeys; Phillipe N Nyambi; J Ayuk; Guido van der Groen; Peter Ndumbe
A pilot study of the prevalence of hepatitis C virus antibodies and hepatitis C virus RNA in southern Cameroon.
The American journal of tropical medicine and hygiene 1995;52(1):98-100.
1994: M Peeters; John N Nkengasong; Betty Willems; E Karita; Eric Delaporte; M Van den Haesevelde; Peter Piot; Guido van der Groen
Antibodies to V3 loop peptides derived from chimpanzee lentiviruses and the divergent HIV-1ANT-70 isolate in human sera from different geographic regions.
AIDS (London, England) 1994;8(12):1657-61.
1994: John N Nkengasong; Wouter Janssens; Leo Heyndrickx; Katrien Fransen; Peter Ndumbe; J Motte; A Leonaers; M Ngolle; J Ayuk; Peter Piot
Genotypic subtypes of HIV-1 in Cameroon.
AIDS (London, England) 1994;8(10):1405-12.
1994: John N Nkengasong; H Claeys; Hans De Beenhouwer; L Heyndrickxs; J Ayuk; V Lobe; Peter Ndumbe
Hepatitis C virus antibody, viraemia and genotypes in individuals infected with HIV-1 in Cameroon.
Annales de la Société belge de médecine tropicale 1994;74(3):249-52.
1994: John N Nkengasong; M Peeters; Peter Ndumbe; Wouter Janssens; Betty Willems; Katrien Fransen; M Ngolle; Peter Piot; Guido van der Groen
Cross-neutralizing antibodies to HIV-1ANT70 and HIV-1IIIB in sera of African and Belgian HIV-1-infected individuals.
AIDS (London, England) 1994;8(8):1089-96.
1994: Wouter Janssens; Leo Heyndrickx; Katrien Fransen; J Motte; M Peeters; John N Nkengasong; Peter Ndumbe; Eric Delaporte; J L Perret; C Atende
Genetic and phylogenetic analysis of env subtypes G and H in central Africa.
AIDS research and human retroviruses 1994;10(7):877-9.
1994: Wouter Janssens; John N Nkengasong; Leo Heyndrickx; Katrien Fransen; Peter Ndumbe; Eric Delaporte; M Peeters; J L Perret; A Ndoumou; C Atende
Further evidence of the presence of genetically aberrant HIV-1 strains in Cameroon and Gabon.
AIDS (London, England) 1994;8(7):1012-3.
1993: John N Nkengasong; M Peeters; M vanden Haesevelde; S S Musi; Betty Willems; Peter Ndumbe; Eric Delaporte; J L Perret; Peter Piot; G van den Groen
Antigenic evidence of the presence of the aberrant HIV-1ant70 virus in Cameroon and Gabon.
AIDS (London, England) 1993;7(11):1536-8.
1993: Peter Ndumbe; A M Luma; J Skalsky; D Mfonfu; C Bonu; R Moyou; J Torimiro; John N Nkengasong
Update on the HIV epidemic in Cameroon.
AIDS (London, England) 1993;7(10):1397-8.
1992: John N Nkengasong; I Van Kerckhoven; G Carpels; G Vercauteren; Peter Piot; Guido van der Groen
HIV screening and confirmation: a simplified and less expensive testing algorithm.
Annales de la Société belge de médecine tropicale 1992;72(2):129-39.
1992: John N Nkengasong; I Van Kerckhoven; G Vercauteren; Peter Piot; Guido van der Groen
Alternative confirmatory strategy for anti-HIV antibody detection.
Journal of virological methods 1992;36(2):159-69.