This Figure shows both the number of cases of invasive meningococcal disease (IMD) reported to National Notifiable Diseases Surveillance System and the number of laboratory confirmed cases of IMD, in Australia, per annum, 1991-2014. It can been seen that in recent years there has been a convergence of these data sets coincident with the development and implementation of the nucleic acid amplification testing for N meningitidis,  which has improved capacity to provide laboratory confirmation of IMD.  The red line represents the number of laboratory confirmed cases of IMD reported to the Australian Meningococcal Surveillance Programme; the blue line represents the number of cases of IMD reported to National Notifiable Diseases Surveillance System.