Diversity of Canadian meningococcal serogroup B isolates and estimated coverage of an investigational meningococcal serogroup B vaccine (4CMenB) Bettinger, Julie A.; Scheifele, David W.; Halperin, Scott A.; Vaudry, Wendy; Findlow, Jamie; Borrow, Ray; Medini, Duccio; Tsang, Raymond
Background: In collaboration with the Canadian Immunization Monitoring Program Active (IMPACT), the National Microbiology Laboratory,the UK Health Protection Agency and Novartis Vaccines, we tested the potential of an investigational 4-component meningococcal B vaccine (4CMenB) to cover Canadian strains circulating from 2006 to 2009. Methods: IMPACT meningococcal surveillance is population based and includes over 50% of Canadian adults and children. All isolates were characterized by Meningococcal Antigen Typing System (MATS) and sequencing for factor H-binding protein (fHbp), Neisseria Heparin Binding Antigen (NHBA) and Neisserial adhesin A(NadA). Results: In total, 157 isolates were tested. Overall, 4CMenB MATS predicted strain coverage was 66% (95% CI: 46–78%), with 26%, 29% and 11% of strains covered by one,two and three vaccine antigens, respectively. The coverage of each antigen was as follows: 13% PorA, 1% NadA, 52% fHbp and 51% NHBA.The majority of strains for clonal complex (cc) 1/44 and cc 60 were covered by NHBA; the majority of strains for cc269 and cc32 were covered by fHbp and NHBA. Coverage for two prevalent strains (sequence type (ST)-269 and ST-154)was 95% and 100%, respectively. Conclusions: 4CMenB has the potential to protect against a significant proportion of Canadian invasive MenB strains.
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Attribution-NonCommercial-NoDerivs 2.5 Canada