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© Perrine Bomme, Guillaume Duménil, Jean-Marc Panaud.
Coloured scanning electron micrograph (SEM) of Neisseria meningitidis on epithelial cells
Publication : Journal of medical microbiology

Genetic and antigenic characterization of Canadian invasive Neisseria meningitidis serogroup C (MenC) case isolates in the post-MenC conjugate vaccine era, 2009-2013

Scientific Fields
Diseases
Organisms
Applications
Technique

Published in Journal of medical microbiology - 01 Feb 2015

Tsang RS, Hoang L, Tyrrell G, Horsman G, Wylie J, Jamieson FB, Lefebvre B, Taha MK

Link to Pubmed [PMID] – 25627205

J. Med. Microbiol. 2015 Feb;64(Pt 2):174-9

We previously reported a shift in the electrophoretic type (ET) of invasive MenC in Canada from predominantly ET-15 to ET-37 in the post-MenC conjugate vaccine period. This study sought to confirm this trend by examining all culture-confirmed invasive MenC case isolates in Canada in the period from 1 January 2009 to 31 December 2013. Of the 50 MenC isolates, 18 belonged to ET-15, 28 belonged to ET-37 (but not ET-15), and four belonged to other clonal types. Analysis of the serotype and serosubtype antigens, porA and fetA gene sequences provided data to show that invasive MenC belonging to ET-15 and ET-37 were two very different subpopulations within the ST-11 clonal complex. Sequence analysis of the fHbp genes suggested that 12 different types of factor H-binding protein were found among the ET-15 isolates while 86 % of ET-37 isolates were found to have fHbp genes predicted to encode peptide 22. The nadA gene in 12 MenC isolates was disrupted due to IS1301 insertion and 11 of these 12 isolates belonged to ET-15. Ten per cent of the invasive MenC were found to have a frame-shift mutation in their fHbp genes that predicted no fHbp produced. Significant diversity and frame-shift mutations of fHbp genes were found in invasive MenC strains in Canada.

https://www.ncbi.nlm.nih.gov/pubmed/25627205