AUTHOR=O’Connor Daniel , Moschese Viviana , Martinon-Torres Federico , Palma Paolo TITLE=Editorial: Vaccination of Special Populations: Protecting the Vulnerable JOURNAL=Frontiers in Immunology VOLUME=12 YEAR=2021 URL=https://www.frontiersin.org/journals/immunology/articles/10.3389/fimmu.2021.815550 DOI=10.3389/fimmu.2021.815550 ISSN=1664-3224