Abstract
In recent years, a change in the epidemiology of meningococcal disease caused by Neisseria meningitidis serogroup W (MenW) has been observed worldwide, with the emergence of new sublineages associated with a higher rate of fatal cases. The present study intends to describe the epidemiology of invasive meningococcal disease (IMD) due to MenW in Portugal between 2003 and 2019, and to genetically characterize population structure. Despite MenW has a low incidence in Portugal, having almost disappeared from 2008 to 2015, since 2016, the number of MenW cases has been steadily increasing at a rate of ~ twofold per year, with more than 80% of the characterized isolates belonging to clonal complex 11 (cc11). Core-genome phylogeny of 25 Portuguese (PT) MenW isolates showed a strain clustering mainly either with the Original UK or the UK 2013 sublineages. Our study also reported for the first time the presence of distinct prophages with a notable overrepresentation of an ~ 32–35-kb PS_1-like prophage found in MenW cc11 genomes. The presence of the PS_1-like prophage in almost all 4723 cc11 genomes selected from Neisseria PubMLST database regardless of the capsular group they belong to suggests an ancestral acquisition of this mobile element prior to capsular switching events. Overall, by mimicking the scenario observed worldwide, this study reinforces the importance of a close monitoring of MenW disease, especially from cc11, in order to promptly adapt the vaccination plan for IMD control in Portugal. Moreover, future studies are needed to understand the putative contribution of prophages to fitness and virulence of PT MenW strains.
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Data availability
Raw sequence reads used in the present study were deposited in the European Nucleotide Archive (ENA) under the study accession number PRJEB36474.
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Acknowledgements
The authors thank the colleagues from the Unit of Technology and Innovation of the National Institute of Health Doutor Ricardo Jorge and the pathologists and clinicians contributing to the Portuguese surveillance system of invasive meningococcal disease.
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CB performed laboratory work and data analysis. AN performed computational study. CB and AN wrote the original draft preparation and reviewed the manuscript. JPG and MJS wrote and reviewed the manuscript. MJS and AN designed and coordinated the study.
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Supplementary Fig. 1
Phylogeny of MenW cc22 isolates based on a dynamic gene-by-gene approach using the cgMLST schema V1.0, with 1605 N. meningitidis core-loci. The Minimum spanning tree was constructed using the goeburst algorithm implemented in the PHYLOViZ Online platform and was based on the number of core-loci shared by 100% of the 268 validated isolates. Filled circles (nodes) represent unique allelic profiles and are colored according to isolates’ isolation country. The size of the circles is proportional to the number of isolates it represents. For better visualization, nodes were collapsed when they exhibited allelic distances <=20. (426 KB)
Supplementary Fig. 2
PS_1-like prophage ORFs content. Annotation was based on Phaster analysis and further confirm by RAST. (823 KB)
Supplementary Table S1
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Bettencourt, C., Nunes, A., Gomes, J.P. et al. Genomic surveillance of Neisseria meningitidis serogroup W in Portugal from 2003 to 2019. Eur J Clin Microbiol Infect Dis 41, 289–298 (2022). https://doi.org/10.1007/s10096-021-04371-7
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DOI: https://doi.org/10.1007/s10096-021-04371-7