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Aggregatibacter species are commensal bacteria of human mucosal surfaces that are sometimes involved in serious invasive infections. During the investigation of strains cultured from various clinical specimens, we encountered a coherent group of 10 isolates that could not be allocated to any validly named species by phenotype, mass spectrometry, or partial 16S rRNA gene sequencing. Whole-genome sequencing revealed a phylogenetic cluster related to but separate fromAggregatibacter aphrophilus . The meanin silico DNA hybridization value for strains of the new cluster versusA. aphrophilus was 56% (range, 53.7 to 58.0%), whereas the average nucleotide identity was 94.4% (range, 93.9 to 94.8%). The new cluster exhibited aggregative properties typical of the genusAggregatibacter . Key phenotypic tests for discrimination of the new cluster from validly namedAggregatibacter species are alanine-phenylalanine-proline arylamidase,N -acetylglucosamine, and β-galactosidase. The nameAggregatibacter kilianii is proposed, with PN_528 (CCUG 70536T or DSM 105094T ) as the type strain.

Whole-Genome Sequencing of Aggregatibacter Species Isolated from Human Clinical Specimens and Description of Aggregatibacter kilianii sp. nov