Concentration and avidity of antibodies to different circumsporozoite epitopes correlate with RTS,S/AS01E malaria vaccine efficacy

RTS,S/AS01E has been tested in a phase 3 malaria vaccine study with partial efficacy in African children and infants. In a cohort of 1028 subjects from one low (Bagomoyo) and two high (Nanoro, Kintampo) malaria transmission sites, we analysed IgG plasma/serum concentration and avidity to CSP (NANP-r...

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Detalles Bibliográficos
Autores: Dobaño, Carlota, 1969-, Sanz Ródenas, Héctor, Sorgho, Hermann, Dosoo, David, Mpina, Maximilian, Ubillos, Itziar, Aguilar, Ruth, Ford, Tom, Díez-Padrisa, Núria, Williams, Nana Aba, Ayestaran, Aintzane, Traore, Ousmane, Nhabomba, Augusto J., Jairoce, Chenjerai Tobias Sixpence, Waitumbi, John, Agnandji, Selidji Todagbe, Kariuki, Simon, Abdulla, Salim, Aponte, John J., Mordmüller, Benjamin, Asante, Kwaku Poku, Owusu-Agyei, Seth, Tinto, Halidou, Campo, Joseph J., Moncunill Piñas, Gemma, Gyan, Ben, Valim, Clarissa, Daubenberger, Claudia
Tipo de recurso: artículo
Estado:Versión publicada
Fecha de publicación:2019
País:España
Institución:Varias* (Consorci de Biblioteques Universitáries de Catalunya, Centre de Serveis Científics i Acadèmics de Catalunya)
Repositorio:Recercat. Dipósit de la Recerca de Catalunya
OAI Identifier:oai:recercat.cat:2445/134962
Acceso en línea:https://hdl.handle.net/2445/134962
Access Level:acceso abierto
Palabra clave:Vacuna de la malària
Infants
Africans
Malaria vaccine
Children
Descripción
Sumario:RTS,S/AS01E has been tested in a phase 3 malaria vaccine study with partial efficacy in African children and infants. In a cohort of 1028 subjects from one low (Bagomoyo) and two high (Nanoro, Kintampo) malaria transmission sites, we analysed IgG plasma/serum concentration and avidity to CSP (NANP-repeat and C-terminal domains) after a 3-dose vaccination against time to clinical malaria events during 12-months. Here we report that RTS,S/AS01E induces substantial increases in IgG levels from pre- to post-vaccination (p\xE2\x80\x89<\xE2\x80\x890.001), higher in NANP than C-terminus (2855 vs 1297 proportional change between means), and higher concentrations and avidities in children than infants (p\xE2\x80\x89<\xE2\x80\x890.001). Baseline CSP IgG levels are elevated in malaria cases than controls (p\xE2\x80\x89<\xE2\x80\x890.001). Both, IgG magnitude to NANP (hazard ratio [95% confidence interval] 0.61 [0.48-0.76]) and avidity to C-terminus (0.07 [0.05-0.90]) post-vaccination are significantly associated with vaccine efficacy. IgG avidity to the C-terminus emerges as a significant contributor to RTS,S/AS01E-mediated protection.

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