Chromobacterium violaceum nosocomial pneumonia in two Japanese patients at an intensive care unit

Hideharu Hagiya, Tomoko Murase, Masato Suzuki, Keigo Shibayama, Yumi Kokumai, Naoto Watanabe, Miyako Maki, Fumio Otsuka

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16 Citations (Scopus)


Chromobacterium violaceum is sensitive to temperature and the infection is usually confined to tropical or subtropical regions. Since Japan has a warm climate, C. violaceum has been scarcely isolated from clinical specimens. With global warming, however, the geographical distribution of C. violaceum infection is likely to change. We report two cases of C. violaceum nosocomial pneumonia that occurred at an intensive care center in Japan. C. violaceum was first detected from a patient in the same center as a pathogenic organism of pneumonia. Later, the organism was isolated from sputum and a ventilator circuit tube of another patient in the center. The two patients were admitted to the center in nearby beds for several days. All of the pathogens were confirmed to be C. violaceum by the nucleic acid sequence of the 16S rRNA gene and were proven to be genetically identical organisms by pulsed field gel electrophoresis. Both patients were managed with well-humidified and heated oxygen using a venturi mask and ventilator to promote excretion of sputum. It was thought that the medical respiratory care devices that provide a humid and warm environment, an optimal condition for proliferation of C. violaceum, can contribute to C. violaceum infection in a hospital environment.

Original languageEnglish
Pages (from-to)139-142
Number of pages4
JournalJournal of Infection and Chemotherapy
Issue number2
Publication statusPublished - Feb 2014


  • Chromobacterium violaceum infection
  • Global warming
  • Intensive care unit
  • Nosocomial infection
  • Respiratory care device

ASJC Scopus subject areas

  • Microbiology (medical)
  • Pharmacology (medical)
  • Infectious Diseases


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