The measles virus is among the most infectious of all know viruses, with an attack rate of well over 90%. That means that over 90% of susceptible people — those who have not been vaccinated or who have not had the disease — will get it if exposed. I’ve seen one case, and that was thirty years ago, although my parents showed me a picture of what I looked like with measles in 1958.
Before the introduction of a vaccine in 1963 measles caused about 4 million cases annually in the USA, leading to 48,000 hospitalizations and 500 deaths. That’s a lot of kids in the hospital and a significant mortality. The measles vaccine has nearly eliminated these things, but not entirely. I recently ran across an interesting article from a couple of years ago that investigated a measles mini-epidemic that happened in Southern California. One thing that caught my eye, something I had not considered before, was the economic cost of the epidemic.