Aerobic, Gram‐stain‐positive, non‐acid‐fast bacteria that form extensively branched substrate and aerial mycelia. Based on culture characteristics, Gram staining, and acid-fast staining, the isolate was presumptively identified as belonging to a Streptomyces species and was sent to the Department of Medical Microbiology and Infectious Diseases, Erasmus MC University Medical Center, Rotterdam, The Netherlands, for sequencing and final identification. the following information is not yet verified Proteus vulgaris blood agar. Actinomyces and Streptomyces produce granules. To the Editor: Streptomyces spp. Proteus mirabilis blood agar. It is 9,025,608 bp long, and has 7,575 ORFs assigned. Streptomyces griseus is a soil-dwelling bacteria like most of the other HSHEMI spe ies … Streptomyces griseus are gram positive, aerobic, filamentous bacteria. It is 9,025,608 bp long, and has 7,575 ORFs assigned. All genera may produce granules. Proteus: Proteus mirabilis blood agar. Suspicious for Actinomyces (see Fig 2). Chemoorganotrophic, having an oxidative type of metabolism. Purulence, heavy. Most actinomycetes in tissue do not stain with the H & E stain commonly used for general histopathology. Streptomycetaceae (Hong et al., 2009). Fig 1. The aerial mycelium at maturity forms chains of three to many spores. Over 500 species of Streptomyces bacteria have been described (Lee , Jung, & Hwang, 2005).Streptomyces species are chemoorganotrophic, filamentous gram-positive bacteria but not acid-alcohol fast, not fungi and occur in the same habitats as fungi and are superficially similar (Ikeda et al., 2003). Streptomyces: Gram stain: Gram-positive: Microscopic appearance: rods; form substrate and aerial mycelium: Oxygen relationship: aerobic bacteria: Motility: nonmotile: Catalase test: ... Gram stain. Nocardia stain partially acid-fast, Actinomyces and Streptomyces are not acid-fast. Jaw abscess aspirate, smear, Gram stain, light microscopy, LPV. Mycelium fragments rarely. Actinomyces are anaerobic, while Nocardia and Streptomyces are aerobic. modified Kinyoun negative Culture characteristics. Streptomyces avermitilis was also been sequenced in October 2001. Granules present. Morphology: Vegetative hyphae (0.5-1.0 um in diameter) produce an extensively branched mycelium that rarely fragments. The non–acid-fast aerobic actinomycetes (i.e., Streptomyces, Actinomadura, Dermatophilus, Nocardiopsis, and the thermophilic actinomycetes) are gram-positive, branching filaments that do not contain mycolic acids in their cell envelopes and are therefore non–acid-fast. the following information is not yet verified Gram positive rods, 0.5-2.0 µm, highly branched, and stain more solidly gram positive than Nocardia (beading). 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