RT Journal Article T1 Are there benefits from thermal bacteria for health? The hydrogenome role A1 Pascoal Ferreira, Patrick A1 González Peña, Daniel A1 Miranda, Carla A1 Poeta, Patrícia A1 Coutinho, João A1 Fernández Riverola, Florentino A1 Torrado Agrasar, Ana Maria A1 Rua Rodriguez, María Luisa A1 Igrejas, Gilberto K1 2503 Geoquímica K1 2508.04 Aguas Subterráneas K1 2414 Microbiología AB In recent years, natural thermal mineral waters have been gaining the special attention of the scientific community, namely in the prevention and treatment of some diseases, due to the microbial properties that exist in these habitats. The aim of this work was to characterize the physicochemical composition and the microbial taxonomic communities present in three thermal waters of the Galician region in Spain and two samples of the northern region in Portugal. These collected water samples were analyzed for physicochemical characterization and the respective hydrogenome of the waters using next generation sequencing together with 16S rRNA gene sequencing. The sequencing showed a high diversity of microorganisms in all analyzed waters; however, there is a clear bacterial predominance of Proteobacteria phylum, followed by Firmicutes, Deinococcus-Thermus, Aquificae and Nitrospira. The main physicochemical parameters responsible for the clustering within the Spanish waters were sulfur compounds (SO32− and S2−), CO32− and neutral pH, and in the Portuguese waters were Mg, Ca and Sr, nitrogen compounds (NO3− and NH4+), Na, Rb, conductivity and dry residue. This work will allow for a better understanding of the microbial community’s composition and how these microorganisms interfere in the physicochemical constitution of these waters often associated with medicinal properties. Furthermore, the hydrogenome may be used as an auxiliary tool in the practice of medical hydrology, increasing the likelihood of safe use of these unique water types. PB Water SN 20734441 YR 2021 FD 2021-05-21 LK http://hdl.handle.net/11093/2183 UL http://hdl.handle.net/11093/2183 LA eng NO Water, 13(11): 1439 (2021) NO European Commission | Ref. (7PM / 2007-2013), n. 324439 DS Investigo RD 25-ene-2025