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Aeromonas taiwanensis sp. nov. and Aeromonas sanarellii sp. nov., two new clinical species from Taiwan

¹ Unit of Microbiology, Rovira i Virgili University, IISPV, Sant Llorenç 21, 43201, Reus, Spain;
² Molecular Diagnostics Center (MDC), Biomolecular Technol S.L., and Miguel Hernández Univ;
³ Department of Medicine, National Cheng Kung University, Tainan, Taiwan.;
⁴ Dept Vet Sci, CECAV-University of Trás-os-Montes e Alto Douro, Vila Real, Portugal

⁵ E-mail: mariajose.figueras{at}urv.cat

Two clinical Aeromonas sp. strains (A2-50 and A2-67) recovered from the wounds of two patients in Taiwan could not be assigned to any known species of this genus based on the sequences of the 16S rDNA gene that showed similarities with A. caviae, A. trota and A. aquariorum ranging from 99.6% to 99.8%. The rpoD phylogenetic tree allocated these two strains to two new and independent phylogenetic lines, the neighbouring species being A. caviae showing 93.2% similarity (56 bp differences) with strain A2-50 and 92.2% (63 bp differences) with strain A2-67. A multi-locus phylogenetic analysis of 5 housekeeping genes (gyrB, rpoD, recA, dnaJ and gyrA; 3684 bp) confirmed both strains as independent phylogenetic lineages within the genus. This data together with the phenotypic characterization and DNA-DNA reassociation results revealed that these two strains are novel Aeromonas species, for which the names Aeromonas taiwanensis sp. nov., with the type strain A2-50 (=CECT 7403T=LMG 24683T) and Aeromonas sanarellii sp. nov., with the type strain A2-67 (=CECT 7402T=LMG 24682T) are proposed.