Neutralizing antibodies against the SARS-CoV-2 Omicron variant BA.1 following homologous and heterologous CoronaVac or BNT162b2 vaccination
Samuel M.S. Cheng,Chris Ka Pun Mok,Yonna W.Y. Leung,Susanna S.S. Ng,Karl C. K. Chan,Fanny W.S. Ko,Chunke Chen,Karen Yiu,Bosco Hoi-Shiu Lam,Eric H. Y. Lau,Ken K. P. Chan,L. Luk,John Kc Li,L. Tsang,Leo L.M. Poon,David S.C. Hui,Malik Peiris +16 more
TLDR
In this paper , the authors showed that a 50% plaque reduction neutralization antibody titer (PRNT50) ≥ 25.6 in their live virus assay corresponded to the threshold for 50% protection from infection against wild-type (WT) SARS-CoV-2 Omicron variant.Abstract:
The Omicron variant is rapidly becoming the dominant SARS-CoV-2 virus circulating globally. It is important to define reductions in virus neutralizing activity in the serum of convalescent or vaccinated individuals to understand potential loss of protection against infection by Omicron. We previously established that a 50% plaque reduction neutralization antibody titer (PRNT50) ≥25.6 in our live virus assay corresponded to the threshold for 50% protection from infection against wild-type (WT) SARS-CoV-2. Here we show markedly reduced serum antibody titers against the Omicron variant (geometric mean titer (GMT) < 10) compared to WT virus 3–5 weeks after two doses of BNT162b2 (GMT = 218.8) or CoronaVac vaccine (GMT = 32.5). A BNT162b2 booster dose elicited Omicron PRNT50 titers ≥25.6 in 88% of individuals (22 of 25) who previously received 2 doses of BNT162b2 and 80% of individuals (24 of 30) who previously received CoronaVac. However, few (3%) previously infected individuals (1 of 30) or those vaccinated with three doses of CoronaVac (1 of 30) met this threshold. Our findings suggest that countries primarily using CoronaVac vaccines should consider messenger RNA vaccine boosters in response to the spread of Omicron. Studies evaluating the effectiveness of different vaccines against the Omicron variant are urgently needed. Serum neutralizing antibody titers against the SARS-CoV-2 Omicron variant markedly increase after a third dose of BNT162b2 vaccine in individuals who previously received either two doses of the BNT162b2 vaccine or two doses of the CoronaVac vaccine. read more
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SARS-CoV-2 Omicron is an immune escape variant with an altered cell entry pathway
Brian J. Willett,Joe Grove,Oscar A. MacLean,Craig Wilkie,Giuditta De Lorenzo,Wilhelm Furnon,Diego Cantoni,S. Scott,Nicola S Logan,Shirin Ashraf,M. Manali,Agnieszka M. Szemiel,Vanessa M. Cowton,Elen Vink,Chris Davis,Patawee Asamaphan,Richard J. Orton,P Holland,Vanessa Silva,David J Pascall,Kathryn Puxty,Sharif Shaaban Muhammad Shaaban,Matthew T. G. Holden,Rute Maria Pinto,Kate Templeton,Pablo R. Murcia,Arvind H. Patel,Paul Klenerman,Susanna Dunachie,Eleanor Barnes,Anthony Brown,S Adele,Barbara Kronsteiner,Sam M. Murray,P. Abraham,Alexandra Deeks,M A Ansari,Lance Turtle,Shona C Moore,James Austin,Alex G. Richter,Christopher J A Duncan,Rebecca Payne,Amy Ehrlich Ash,C. J. Koshy,Beatrix Kele,Teresa Cutino-Moguel,Derek Fairley,James McKenna,Tanya Curran,Helen Adams,Christophe Fraser,David Bonsall,Helen R. Fryer,Katrina A. Lythgoe,Laura Hayden Thomson,Tanya Golubchik,Abigail Murray,D. Singleton,Shaun M. Beckwith,A Mantzouratou,Magdalena Barrow,Sarah L. Buchan,Nicola Reynolds,Ben Warne,Joshua Maksimovic,Karla Spellman,Kathryn Mccluggage,M. John,Robert H. Beer,Safiah Afifi,Sian Natasha Morgan,Andrew L. Mack,Angela Marchbank,Anna Price,A.C. Morriss,Catherine Bresner,Christine Kitchen,I. Merrick,Joel Southgate,Martyn F Guest,Owen Bowden Jones,Robert F. Munn,Thomas R. Connor,Tom Whalley,T. Race Workman,William Oliver Fuller,Amita Patel,Bindi Patel,G. Nebbia,Jonathan D. Edgeworth,Luke B Snell,Rahul Batra,Themoula Charalampous,Angela Helen Beckett,Ekaterina Shelest,Samuel Robson,Anthony Underwood,Benjamin Taylor,Corin Yeats,David M. Aanensen,Khalil Abudahab,Mirko Menegazzo,Amelia Joseph,Gemma Clark,Hannah C. Howson-Wells,Louise Berry,Manjinder Khakh,Michelle Lister,T. Boswell,Vicki M. Fleming,Christopher W Holmes,Claire McMurray,Jessica R. Shaw,Julian W. Tang,Karlie Fallon,Minaxshi Odedra,Nicholas J. Willford,Paul W Bird,Thomas Helmer,L.A. Williams,Nicole R. Sheriff,Sharon Campbell,Veena Raviprakash,Vickie L. Blakey,Christopher I. Moore,Fei Sang,Johnny Debebe,Matthew Carlile,Matthew Loose,Nadine Holmes,Victoria Wright,M. Torok,William L Hamilton,Alessandro M Carabelli,Andrew Jermy,Beth Blane,Carol Churcher,Catherine Ludden,Dinesh Aggarwal,Elaine J. Westwick,Ellen Brigid Brooks,Georgina M. McManus,Katerina Galai,Ken R. Smith,Kim Smith,MacGregor Cox,Mireille Fragakis,Patrick Maxwell,Sarah Judges,Sharon J. Peacock,Theresa Feltwell,A. K. Kenyon,Sahar Eldirdiri,Thomas Davis,Joshua F. Taylor,NgeeKeong Tan,Alexander E. Zarebski,Bernardo Gutierrez,Jayna Raghwani,Louis du Plessis,Moritz U. G. Kraemer,Oliver G. Pybus,Sarah François,S. W. Attwood,Tetyana I. Vasylyeva,Aminu S Jahun,Ian Goodfellow,Iliana Georgana,Malte L Pinckert,Myra Hosmillo,Rhys E. Izuagbe,Yasmin Chaudhry,Felicity Ryan,Hannah Louise Lowe,Samuel Rajan Moses,Luke Bedford,James S Cargill,Warwick S. Hughes,J. Moore,Susanne Stonehouse,Divya Shah,Jack Lee,Julianne R Brown,Kathryn A. Harris,Laura Atkinson,Nathaniel Storey,Moira J. 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Journal ArticleDOI
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Heterologous immunization with inactivated vaccine followed by mRNA-booster elicits strong immunity against SARS-CoV-2 Omicron variant
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TL;DR: In this paper , the authors observed that an mRNA vaccine booster in individuals vaccinated with two doses of inactivated vaccine significantly increased the plasma level of specific antibodies that bind to the receptor-binding domain (RBD) or spike (S) ectodomain (S1 + S2) of both the G614 and the Omicron variants, compared to two or three doses of homologous inactivated vaccines.
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TL;DR: In this paper , the benefit of a booster immunization to protect against the Omicron variant and demonstrate the challenge to monoclonal antibody therapy is highlighted. But, the results highlight the need for additional immunization and demonstrate that much of the vaccine efficacy may rely on T cells.
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