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J Infect Chemother. 2014 Jun;20(6):390-3. doi: 10.1016/j.jiac.2014.01.010. Epub 2014 Mar 12.

A case of pneumonia caused by Legionella pneumophila serogroup 12 and treated successfully with imipenem.

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Department of Respiratory Medicine, Saiseikai Yamagata Saisei Hospital, Japan.
Department of Respiratory Medicine, Saiseikai Yamagata Saisei Hospital, Japan. Electronic address:
Department of Microbiology, Yamagata Prefectural Institute of Public Health, Japan.
Department of Bacteriology I, National Institute of Infectious Diseases, Japan.


The patient was an 83-year-old man hospitalized for Haemophilus influenzae pneumonia, who developed recurrent pneumonia after improvement of the initial episode. Legionella pneumophila serogroup 12 was isolated from the sputum, accompanied by increased serum antibody titers to L. pneumophila serogroup 12. Therefore, the patient was diagnosed as having Legionella pneumonia caused by L. pneumophila serogroup 12. Case reports of pneumonia caused by L. pneumophila serogroup 12 are rare, and the case described herein is the first report of clinical isolation of this organism in Japan. When the genotype was determined by the protocol of The European Working Group for Legionella Infections (Sequence-Based Typing [SBT] for epidemiological typing of L. pneumophila, Version 3.1), the sequence type was ST68. Imipenem/cilastatin therapy was found to be effective for the treatment of Legionella pneumonia in this patient.


Imipenem/cilastatin; Legionella pneumonia; Legionella pneumophila serogroup 12; Sequence-based typing

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