I think you swapped Chicken Pox and Measles in your example, as the delta R0 seems similar to Chicken Pox and Chicken Pox has a lower R0 than Measles.
Chicken Pox, which, pre-vaccine, was considered an infection everyone would get.
(Or wikipedia is wrong about R0 values for various diseases, including the delta variant)
I think you swapped Chicken Pox and Measles in your example, as the delta R0 seems similar to Chicken Pox and Chicken Pox has a lower R0 than Measles.
Chicken Pox, which, pre-vaccine, was considered an infection everyone would get.