Rothia aerolata sp. nov., isolated from exhaust air of a pig barn.

A Gram-stain-positive, coccoid, oxidase-negative, non-motile isolate from exhaust air of a pig barn, collected on 17 September 2014 and designated strain 140917-MRSA-09T, was subjected to a comprehensive taxonomic investigation. A comparative analysis of the 16S rRNA gene sequence showed highest similarities to Rothia amarae, Rothia terrae and Rothia endophytica (all <97.8 %). The G+C content of the genomic DNA was 58.9 mol %. The quinone system consisted of the major menaquinones MK-8 and MK-7. The polar lipid profile of strain 140917-MRSA-09T contained the major lipids diphosphatidylglycerol and phosphatidylglycerol and moderate amounts of dimannosylglyceride and trimannosyldiacylglycerol. The polyamine pattern was composed of the major amines putrescine and spermidine. In the fatty acid profile, iso- and anteiso-branched acids predominated (anteiso-C15 : 0, anteiso-C17 : 0, iso-C16 : 0). The strain showed a chemoheterotrophic metabolism and was able to grow aerobically well on nutrient-rich media at temperatures from 15-36 °C (weak at 42 °C), pH 5.5-9.5 and NaCl concentrations ranging from 0 to 7 % (w/v). Growth under anaerobic conditions was weak. Physiological traits as well as unique traits in the quinone pattern and the fatty acid pattern distinguished strain 140917-MRSA-09T from the most closely related species. All these data showed that strain 140917-MRSA-09T is a representative of a novel species of the genus Rothia, for which we propose the name Rothia aerolata sp. nov. The type strain is 140917-MRSA-09T (=LMG 29446T=CCM 8669T).