These resources provide a detailed overview of cutting-edge research intersecting T cell immunology, microbiome ecology, and antibiotic effects, often utilizing multi-omics approaches. A significant portion of the material focuses on T cell subsets crucial for immune regulation, specifically the roles of Regulatory T (Treg) cells in maintaining peripheral tolerance via mechanisms controlled by factors like the transcription factor FOXP3, and the differentiation and pathogenic activity of T helper 17 (Th17) cells implicated in autoimmune diseases, often regulated by cytokines (e.g., IL-21, TGF-β) and nuclear receptors (e.g., RORγt). Concurrently, numerous studies investigate the profound and often lasting impact of antibiotic exposure on the gut microbiome, detailing how antibiotics cause dysbiosis, reduce microbial diversity, select for resistance genes, and delay microbial maturation in early life, factors associated with increased susceptibility to conditions like allergic asthma and C. difficile infection (CDI). Mechanistically, these effects are linked to alterations in the metabolome, where microbial metabolites such as short-chain fatty acids (SCFAs) like butyrate and propionate are shown to causally relate to metabolic traits like insulin response and to actively promote the generation of anti-inflammatory Treg cells, while new diagnostic and therapeutic strategies are being developed, including narrow-spectrum antibiotics like lolamicin to spare the gut microbiome and advanced ingestible devices for localized intestinal profilingCollectively, these publications highlight the ongoing research into harnessing Treg biology for treating various diseases.