Identification of Legionella rubrilucens Isolated from a Hot Spring for Foot-soaking in Niigata, Japan

摘要

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 alpha-ketoglutarate (GVPC alpha) medium at 36 degrees 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 alpha-ketoglutarate (BCYE alpha) agar at 36 degrees C for 7 d, it exhibited red autofluorescence under UV light (365 nm). The dominant cellular fatty acids of the strain HYNE-20 were 16:1 omega 7c (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.