AUTHOR=Caserta Stefano , Pera Alejandra TITLE=Editorial: Immune Responses to Persistent or Recurrent Antigens: Implications for Immunological Memory and Immunotherapy JOURNAL=Frontiers in Immunology VOLUME=12 YEAR=2021 URL=https://www.frontiersin.org/journals/immunology/articles/10.3389/fimmu.2021.643989 DOI=10.3389/fimmu.2021.643989 ISSN=1664-3224