In 2009, there were 89 cases of IPD in the NT population, 59 in 2010 and 114 in 2011; 25 (10%) of these 262 cases were the unique PCV13 serotypes (3, 6A and 19A) and 17(7%) of these were Indigenous, four (1.5%) were Aboriginal children < 2 years of age - about one per year (unpublished, Centre for Disease Control, NT Health).