Figure 1 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, 1991-2013. 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.