Vaccines and community immunity

Vaccines work.

Most of us are too young to remember the U.S. polio epidemic of 1952, which killed 3,145 children and left another 21,269 reeling from permanent, disabling paralysis.

I was only two years old at that time, but I remember the sugar cubes treated with oral vaccine that were distributed in our high school hallways in 1962.

I am also grateful for the team of scientists, led by Jonas Salk, who developed the first…