Footer 1

Nav Bar

Become a subscriber today to get unlimited access

Member-exclusive 

Finish this story and enjoy unlimited, ad-free access to Nautilus. Plans start at $6.17/month, billed annually.

Read without limits

Unlock this story + our newsletter, for FREE! Already a newsletter subscriber? Just click the "Log in" link above. 

Register to continue reading.

Nautilus

Rebecca Smullin Dawson is an epidemiologist and associate professor of Biology and Global Health Studies at Allegheny College.

Rebecca Smullin Dawson

Health

What the Measles Vaccine’s “97% Effective” Rating Means for Pittsburgh Parents