Though measles was declared eliminated in the U.S. decades ago, outbreaks do still happen here, and in other places it’s much more common. Before vaccines were widely available, it killed an estimated 2.6 million people worldwide each year.
Research:

Dorothy Crowfoot Hodgkin’s Crystalline Chemistry, Part 2
43:14

Dorothy Crowfoot Hodgkin’s Crystalline Chemistry, Part 1
38:04

SYMHC Classics: Sarah Bradlee Fulton
32:28