Identification of Legionella rubrilucens Isolated from a Hot Spring for Foot-soaking in Niigata, Japan
2012
: In May 2011, strain HYNE-20 (=JCM 17837) was isolated from a sample of hot spring water from a foot spa in Niigata, Japan, by a plating method using glycine vancomycin polymyxin B cycloheximide α-ketoglutarate (GVPCα) medium at 36°C for 7 d. The 16S rDNA sequences (1,469bp) of this strain (accession number: AB638719) had high (99.7%) similarity to Legionella rubrilucens, and we identified that this strain was indeed Legionella rubrilucens. When this strain was cultured on buffered charcoal yeast extract α-ketoglutarate (BCYEα) agar at 36°C for 7 d, it exhibited red autofluorescence under UV light (365 nm) . The dominant cellular fatty acids of the strain HYNE-20 were 16:1ω7c (29.9%) , and the guanine-plus-cytosine (G+C) content of DNA was 49.0 mol%. This is the first report that Legionella rubrilucens was isolated from a hot spring for foot soaking.
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