Fig. 1

a. Distribution of number of secondary infections per index TB patient with negative binomial distribution fitted to count data in Victoria, for the period 2005–2015. The number of index patients with zero infections was 3166 (beyond limit of vertical axis). b. Distribution of secondary TB disease by index patients in Victoria, for the period 2005–2015, with negative binomial distribution fitted to count data. The number of index patients with zero secondary active TB was 4054 (beyond limit of vertical axis). Both panels include data for both PTB and EPTB index patients and all types of contacts