Abstract
Novel, white-pigmented, Gram-negative bacterial strains (K-M0706T, K-M0228, K-M0252, K-M0260) were isolated from clinical samples. With a similarity of up to 69.7 % to Serratia nevei S15T and up to 63.8 % to Serratia marcescens ATCC 13880T, as determined by digital DNA-DNA hybridization, the strains were assigned as novel species of the genus Serratia. The species can easily be differentiated from the red colored Serratia marcescens sensu stricto by its white phenotype. Discrimination between this strain and Serratia nevei is possible due to alpha-glucosidase activity and O/129-resistance, as shown for strain K-M0706T. The major fatty acids were determined as myristate, palmitate, cis–9,10-methylenehexadecanoate, linoleate, and (all cis-9,10)-methyleneoctadecanoate. These phenotypical and genomic data support the assignment of a novel species within the genus Serratia, named S. sarumanii due to its pathogenicity and white phenotype, with strain K-M0706T as the type strain.
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