Got any sources to back that up? 1% of an entire population is still a massive number of people. Or to put things another way: it's pretty easy to interact with

Got any sources to back that up? 1% of an entire population is still a massive number of people. Or to put things another way: it's pretty easy to interact with 100 people each day so even just 1% of the population means you will bump into someone who isn't immunised during the course of your day.