AUTHOR= TITLE=Retraction: The variation of nasal microbiota caused by low levels of gaseous ammonia exposure in growing pigs JOURNAL=Frontiers in Microbiology VOLUME=Volume 16 - 2025 YEAR=2025 URL=https://www.frontiersin.org/journals/microbiology/articles/10.3389/fmicb.2025.1697759 DOI=10.3389/fmicb.2025.1697759 ISSN=1664-302X