Isolation of <I>Legionella</I> Species from <I>Noyu</I> （Unattended Natural Hot Springs in Mountains and Fields） Samples in Japan
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概要
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In order to understand the habitation conditions of the bacteria of the genus <I>Legionella</I> in <I>Noyu</I> （unattended natural hot springs in mountains and fields） in Japan, isolation of <I>Legionella</I> spp. was attempted in the <I>Noyu</I> samples from 11 prefectures nationwide between May and September 2012, and the following results were obtained. Overall, <I>Legionella</I> spp. was isolated from 16 of 43 samples （37.2%）. The species was isolated from the Hokkaido region to the Chugoku region but not from the Shikoku region to the Kyushu region. The number of bacteria detected was usually small, less than 5.0×10<SUP>1</SUP> CFU/100 ml, as found in 11 samples （68.8%）, while counts of 10<SUP>2</SUP> or more to 10<SUP>3</SUP> or less CFU/100 ml were found in two samples （12.5%）. <I>Legionella pneumophila</I> was the most commonly found strain, with 19 strains （90.5%） found, and was the dominant species. Regarding the serogrouping, four strains （21.1%） fell under group 1, the most common grouping, followed by three strains （15.8%） in group 3, two strains （10.5%） in group 5, etc. Moreover, the detected bacterial strains other than <I>L. pneumophila</I> included two strains （9.5%） of <I>L. londiniensis</I>. The temperature of the <I>Noyu</I> from which <I>Legionella</I> spp. was isolated was between 33.1°C and 41.5°C with a pH ranging from 5.2 to 8.1. The present report is the first report to clarify the habitation conditions of strains of <I>Legionella</I> spp. isolated from <I>Noyu</I> in Japan.
- 日本防菌防黴学会の論文
著者
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FUKUYAMA MASAFUMI
School of Life and Environmental Science, Azabu University
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Fukuyama Masafumi
School Of Environmental Health Azabu University
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Ishizaki Naoto
School Of Life And Environmental Science Azabu University
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Edagawa Akiko
Department Of Environment Health Osaka Prefectural Institute Of Public Health
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FURUHATA KATSUNORI
School of Environmental Health
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