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J Med Microbiol 54 (2005), 1077-1082; DOI: 10.1099/jmm.0.45846-0
© 2005 Society for General Microbiology
ISSN 0022-2615

Importance of Providencia species as a major cause of travellers’ diarrhoea

Myonsun Yoh1, Junko Matsuyama1, Motoki Ohnishi3, Kazuhiro Takagi3, Hirozane Miyagi3, Kazuhiro Mori3, Kwon-Sam Park2, Takahiro Ono2 and Takeshi Honda2

1,2Center for Emerging Infectious Diseases1 and Department of Bacterial Infections2, Research Institute for Microbial Diseases, Osaka University, 3-1 Yamadaoka, Suita, Osaka 565-0871, Japan 3Kansai Airport Quarantine Station, 1 Senshu Kuko Naka, Tajiri-cho, Sennan-gun 549-0011, Japan

Correspondence Myonsun Yoh myon{at}biken.osaka-u.ac.jp

Received July 30, 2004
Accepted July 24, 2005

In this study the importance of Providencia species as a cause of travellers’ diarrhoea was examined using a selective medium developed by the authors. Providencia species could easily be distinguished from other enteric pathogens by the colour of the colonies obtained. Nine strains of Providencia alcalifaciens, nine of Providencia rettgeri and five of Providencia stuartii were isolated from 130 specimens, representing a surprisingly high incidence of infection compared with other pathogens isolated on SS agar and TCBS agar. Patients infected with P. rettgeri complained of abdominal pain, as for other Providencia species, but also of vomiting, which is rather characteristic of P. rettgeri infection. To analyse the pathogenicity of these isolates, their invasiveness was examined using Caco-2 cells. Most of the P. rettgeri strains invaded Caco-2 cells. Random amplified polymorphic DNA (RAPD) fingerprinting showed the same profile for two P. rettgeri isolates from individuals travelling in the same tour group. The results show that Providencia species, especially P. rettgeri, might cause diarrhoea, and that these species are important pathogens.

Abbreviations: EIEC, enteroinvasive Escherichia coli; PMXMP, polymyxin-mannitol-xylitol medium for Providencia; RAPD, random amplified polymorphic DNA.




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