Hypervirulent serogroup W meningococcal strain belonging to the ST-11 clonal complex is associated with higher case fatality rates: nationwide cohort study of invasive meningococcal disease caused by serogroup W in England from 2010-2019.
BACKGROUND In 2009, England experienced an increase in serogroup W (MenW) invasive meningococcal disease (IMD) caused by the hypervirulent ST-11 clonal complex (MenW:cc11) South American strain sublineage. The 'original UK strain' that emerged in 2009 evolved into the '2013 strain' in 2013 resulting in further increase...