AUTHOR=Schwarzer Martin , Tlaskalova-Hogenova Helena , Leulier François , Schabussova Irma TITLE=Editorial: Employing Experimental Gnotobiotic Models to Decipher the Host-Microbiota Cross-Talk in Health and Disease JOURNAL=Frontiers in Immunology VOLUME=12 YEAR=2021 URL=https://www.frontiersin.org/journals/immunology/articles/10.3389/fimmu.2021.729052 DOI=10.3389/fimmu.2021.729052 ISSN=1664-3224