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Phenotypic Identification of Actinomycesand Related Species Isolated from Human Sources

ABSTRACT Recent advancements in chemotaxonomic and molecular biology-based identification methods have clarified the taxonomy of the genusActinomyces and have led to the recognition of several newActinomyces and related species.Actinomyces-like gram-positive rods have increasingly been isolated from various clinical specimens. Thus, an easily accessible scheme for reliable differentiation at the species level is needed in clinical and oral microbiology laboratories, where bacterial identification is mainly based on conventional biochemical methods. In the present study we designed a two-step protocol that consists of a flowchart that describes rapid, cost-efficient tests for preliminary identification of Actinomyces and closely related species and an updated more comprehensive scheme that also uses fermentation reactions for accurate differentiation of Actinomyces and closely related species.