Notification rates of IPD in children aged under 2 years declined in both 2011 and 2012, with a fall of 43% recorded in 2012.  This large decrease in the number of IPD notifications in infants in 2012 is likely due to the July 2011 replacement of 7vPCV with 13vPCV on the NIP for all infants.  Overall, the large decrease in the notification rate experienced in this age group as a result of the introduction of the universal 7vPCV immunisation program in 2005 has been maintained. Following small declines in 2009 and 2010, the overall rate of IPD in adults aged 65 years or over has increased in both 2011 and 2012. End description.