measles is one of the most infectious diseases known, with an R0 estimated to be 12 to 18 (that is, a single infected person typically can infect somewhere between twelve and eighteen other people). Chicken pox is 10 to 12. Smallpox is 3.5 to 6. Ebola is 1.5 to 1.9. Seasonal influenza ranges from 0.9 to 2.1.
