• The graph for the 5-9 year old cohort show a dramatic peak in notification rates for those who received DTPa for all doses. As South Australia switched to DTPa earlier than NSW, rates peaked earlier for the 5-9 year old cohort at 1117.4 per 100,000 population in 2010. NSW peaked after in 2011 at 931.3 per 100,000 population.