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Volume 23, Number 2—February 2017
Research Letter

Outbreak of Legionnaire’s Disease Caused by Legionella pneumophila Serogroups 1 and 13

Toshiro Kuroki1Comments to Author , Junko Amemura-Maekawa1, Hitomi Ohya, Ichiro Furukawa, Miyuki Suzuki, Tomoka Masaoka, Kastuhiro Aikawa, Kazumi Hibi, Masatomo Morita, Ken-Ichi Lee, Makoto Ohnishi, and Fumiaki Kura
Author affiliations: Kanagawa Prefectural Institute of Public Health, Kanagawa, Japan (T. Kuroki, H. Ohya, I. Furukawa, M. Suzuki, T. Masaoka, K. Aikawa, K. Hibi); National Institute of Infectious Diseases, Tokyo, Japan (J. Amemura-Maekawa, M. Morita, K. Lee, M. Ohnishi, F. Kura)

Main Article


Genetic characteristics of Legionella pneumophila isolates from patients with pneumonia and from environmental samples, Japan, 2015*

Serogroup PGFE profile† ST‡ ST profile, flaA, pilE, asd, mip, mompS, proA, neuA Sample source cgMLST profile§
1 A ST2114 6, 10, 21, 3, 17, 14, 9 Patients 1, 7 a, b
Bath 1 (bath water)¶ b

Bath 2 (spout swab)
6, 10, 21, 3, 17, 14, 57
Bath 1 (bath water)¶
1 B ST2114 6, 10, 21, 3, 17, 14, 9 Patients 2, 5, 7 b, b, b
Bath 1(bathtub swab) b

Bath 2 (bath water)¶
6, 10, 20, 13, 9, 4, 11
Bath 3 (hair trap debris)
13 B ST2113 6, 10, 21, 10, 17, 14, 209 Patient 2 d
Bath 1 (bath water)¶ d
Bath 2 (bath water)¶ Not done

Bath 2 (spout swab)
10 D ST2115 7, 10, 17, 3, 13, 14, 207 Bath 4 (spout swab) e
Bath 5 (bathtub swab) f

*cgMLST, core genome multilocus sequence typing; PFGE, pulsed-field gel electrophoresis; ST, sequence type.
†Profiles A and B were obtained from clinical and environmental samples. Profiles C and D were obtained from environmental samples only.
‡New STs from this study were assigned ST2113, ST2114, ST2115, and ST2121.
§Each profile letter indicates a tentative cgMLST profile of 1 strain.
¶Concentrations of L. pneumophila in bath water were 800 CFU/L in bath 1, and 1,100 CFU/L in bath 2.

Main Article

1These authors contributed equally to this article.

Page created: January 18, 2017
Page updated: January 18, 2017
Page reviewed: January 18, 2017
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