AUTHOR= Frontiers Editorial Office TITLE=Expression of concern: Microbiome-based hypothesis on Ivermectin's mechanism in COVID-19: Ivermectin feeds bifidobacteria to boost immunity JOURNAL=Frontiers in Microbiology VOLUME=13 YEAR=2023 URL=https://www.frontiersin.org/journals/microbiology/articles/10.3389/fmicb.2022.1128469 DOI=10.3389/fmicb.2022.1128469 ISSN=1664-302X