When it comes to highly contagious airborne viruses like measles, a small drop below the critical 95% herd immunity threshold is all it takes to shift a population from containment to exponential, uncontrolled outbreaks. In this post, we explore the maths behind transmission rates, discuss the trends in case numbers in Australia and the US, compare the reasons for vaccine acceptance or hesitancy in both countries, and discuss the dangers should the trends continue. Check out the full infographic below for the step-by-step breakdown.
