In the NT, booster pneumococcal vaccines are recommended at 18 months of age. This is largely due to the previous schedule which included 23-valent pneumococcal polysaccharide vaccine (23PPV) as a booster dose at 18 months. A 3+1 PHiD-CV10 schedule replaced 3+1 PCV7-23PPV in 2009, and the booster age remained at 18 months. In Queensland (QLD) and in Western Australia (WA) the vaccination schedules allow for PCV13 boost at 12 months of age for high risk and Indigenous children.