Durability of ChAdOx1 Ncov-19 (AZD1222) Vaccine and Hybrid Humoral Immunity Against Variants Including Omicron BA.1 and BA.4 Six Months after Vaccination: A Randomised, Phase 1b/2a Trial Shabir A. Madhi , Gaurav Kwatra , Richard Welch , Anthonet L. Koen , Vicky L. Baillie , Clare Cutland , Lee Fairlie , Sherman D. Padayachee , Keertan Dheda , Shaun L. Barnabas , Qasim Ebrahim Bhorat , Carmen Briner , Khatija Ahmed , Parvinder K. Aley , Sutika Bhikha , As&aposad Ebrahim Bhorat , Aliasgar Esmail , Elizea Horne , Haajira Kaldine , Christian K. Mukendi , Vimbai Sharon Madzorera , Nelia P. Manamela , Mduduzi Masilela , Tandile Hermanus , Thopisang Motlou , Nonkululeko Mzindle , Suzette Oelofse , Faeezah Patel , Sarah Rhead , Lindie Rossouw , Carol Taoushanis , Samuel van Eck , Teresa Lambe , Sarah C. Gilbert , Andrew J. Pollard , Penny L. Moore , Alane Izu Social Science Research Network（2022）
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