Provisional Entrants, Exemptions, and Kindergarteners Up-to-Date on Vaccination Before and After a Regulatory Change in Pennsylvania, 2015-2019

Abstract
Objectives:Before the 2017-2018 school year, Pennsylvania shortened the grace period for provisional entrants—kindergarteners who are not up-to-date on vaccination and do not have medical or nonmed...
Funding Information
  • Merck Sharp and Dohme (MISP #59241)