Yep did some rough calcs in Excel there, staggering how much a difference that makes after 10 iterations.
Although by my calculation 1.3 would give you 14 infections, 1.4 would infect 28.
Extremely localised compared with 59000 though.
And by my reckoning that means 59000 are being infected after the 10th iteration, but there's the total of everyone who's been infected at the previous iterations, meaning 1 person has infected 88,572 people by that stage!