In Victoria, Australia, invasive meningococcal disease caused by Neisseria meningitidis serogroup W increased from 4% of all cases in 2013 to 30% in 2015. This increase resulted largely from strains similar to those in the serogroup W sequence type 11 clonal complex, previously described in the United Kingdom and South America.
Keywords: Australia; Neisseria meningitidis; Victoria; bacteria; epidemiology; invasive meningococcal disease; meningitis; meningococcal infections; meningococcal serogroup W disease; serogroup W.