Alteration of the Phenotypic and Pathogenic Patterns of Burkholderia pseudomallei that Persist in a Soil Environment

Yao-Shen Chen Division of Infectious Diseases, Kaohsiung Veterans General Hospital, Kaohsiung, Taiwan; Graduate Institute of Science Education and Environmental Education, National Kaohsiung Normal University, Kaohsiung; Taiwan/Department of Internal Medicine, National Yang-Ming University, Taipei, Taiwan; Infectious Diseases Pathology Branch, Centers for Disease Control and Prevention, Atlanta, Georgia; Department of Molecular Biology and Human Genetics, Tzu-Chi University, Hualien, Taiwan; Institute of Medical Sciences, Tzu-Chi University, Hualien, Taiwan; Department of Biotechnology, National Kaohsiung Normal University, Kaoshiung, Taiwan

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Wun-Ju Shieh Division of Infectious Diseases, Kaohsiung Veterans General Hospital, Kaohsiung, Taiwan; Graduate Institute of Science Education and Environmental Education, National Kaohsiung Normal University, Kaohsiung; Taiwan/Department of Internal Medicine, National Yang-Ming University, Taipei, Taiwan; Infectious Diseases Pathology Branch, Centers for Disease Control and Prevention, Atlanta, Georgia; Department of Molecular Biology and Human Genetics, Tzu-Chi University, Hualien, Taiwan; Institute of Medical Sciences, Tzu-Chi University, Hualien, Taiwan; Department of Biotechnology, National Kaohsiung Normal University, Kaoshiung, Taiwan

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Cynthia S. Goldsmith Division of Infectious Diseases, Kaohsiung Veterans General Hospital, Kaohsiung, Taiwan; Graduate Institute of Science Education and Environmental Education, National Kaohsiung Normal University, Kaohsiung; Taiwan/Department of Internal Medicine, National Yang-Ming University, Taipei, Taiwan; Infectious Diseases Pathology Branch, Centers for Disease Control and Prevention, Atlanta, Georgia; Department of Molecular Biology and Human Genetics, Tzu-Chi University, Hualien, Taiwan; Institute of Medical Sciences, Tzu-Chi University, Hualien, Taiwan; Department of Biotechnology, National Kaohsiung Normal University, Kaoshiung, Taiwan

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Maureen G. Metcalfe Division of Infectious Diseases, Kaohsiung Veterans General Hospital, Kaohsiung, Taiwan; Graduate Institute of Science Education and Environmental Education, National Kaohsiung Normal University, Kaohsiung; Taiwan/Department of Internal Medicine, National Yang-Ming University, Taipei, Taiwan; Infectious Diseases Pathology Branch, Centers for Disease Control and Prevention, Atlanta, Georgia; Department of Molecular Biology and Human Genetics, Tzu-Chi University, Hualien, Taiwan; Institute of Medical Sciences, Tzu-Chi University, Hualien, Taiwan; Department of Biotechnology, National Kaohsiung Normal University, Kaoshiung, Taiwan

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Patricia W. Greer Division of Infectious Diseases, Kaohsiung Veterans General Hospital, Kaohsiung, Taiwan; Graduate Institute of Science Education and Environmental Education, National Kaohsiung Normal University, Kaohsiung; Taiwan/Department of Internal Medicine, National Yang-Ming University, Taipei, Taiwan; Infectious Diseases Pathology Branch, Centers for Disease Control and Prevention, Atlanta, Georgia; Department of Molecular Biology and Human Genetics, Tzu-Chi University, Hualien, Taiwan; Institute of Medical Sciences, Tzu-Chi University, Hualien, Taiwan; Department of Biotechnology, National Kaohsiung Normal University, Kaoshiung, Taiwan

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Sherif R. Zaki Division of Infectious Diseases, Kaohsiung Veterans General Hospital, Kaohsiung, Taiwan; Graduate Institute of Science Education and Environmental Education, National Kaohsiung Normal University, Kaohsiung; Taiwan/Department of Internal Medicine, National Yang-Ming University, Taipei, Taiwan; Infectious Diseases Pathology Branch, Centers for Disease Control and Prevention, Atlanta, Georgia; Department of Molecular Biology and Human Genetics, Tzu-Chi University, Hualien, Taiwan; Institute of Medical Sciences, Tzu-Chi University, Hualien, Taiwan; Department of Biotechnology, National Kaohsiung Normal University, Kaoshiung, Taiwan

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Hsin-Hou Chang Division of Infectious Diseases, Kaohsiung Veterans General Hospital, Kaohsiung, Taiwan; Graduate Institute of Science Education and Environmental Education, National Kaohsiung Normal University, Kaohsiung; Taiwan/Department of Internal Medicine, National Yang-Ming University, Taipei, Taiwan; Infectious Diseases Pathology Branch, Centers for Disease Control and Prevention, Atlanta, Georgia; Department of Molecular Biology and Human Genetics, Tzu-Chi University, Hualien, Taiwan; Institute of Medical Sciences, Tzu-Chi University, Hualien, Taiwan; Department of Biotechnology, National Kaohsiung Normal University, Kaoshiung, Taiwan

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Hao Chan Division of Infectious Diseases, Kaohsiung Veterans General Hospital, Kaohsiung, Taiwan; Graduate Institute of Science Education and Environmental Education, National Kaohsiung Normal University, Kaohsiung; Taiwan/Department of Internal Medicine, National Yang-Ming University, Taipei, Taiwan; Infectious Diseases Pathology Branch, Centers for Disease Control and Prevention, Atlanta, Georgia; Department of Molecular Biology and Human Genetics, Tzu-Chi University, Hualien, Taiwan; Institute of Medical Sciences, Tzu-Chi University, Hualien, Taiwan; Department of Biotechnology, National Kaohsiung Normal University, Kaoshiung, Taiwan

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Ya-Lei Chen Division of Infectious Diseases, Kaohsiung Veterans General Hospital, Kaohsiung, Taiwan; Graduate Institute of Science Education and Environmental Education, National Kaohsiung Normal University, Kaohsiung; Taiwan/Department of Internal Medicine, National Yang-Ming University, Taipei, Taiwan; Infectious Diseases Pathology Branch, Centers for Disease Control and Prevention, Atlanta, Georgia; Department of Molecular Biology and Human Genetics, Tzu-Chi University, Hualien, Taiwan; Institute of Medical Sciences, Tzu-Chi University, Hualien, Taiwan; Department of Biotechnology, National Kaohsiung Normal University, Kaoshiung, Taiwan

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Melioidosis is caused by the soil-borne pathogen Burkholderia pseudomallei. To investigate whether the distinct phenotypic and virulent characteristics result from environmental adaptations in the soil or from the host body, two pairs of isogenic strains were generated by passages in soil or mice. After cultivation in soil, the levels of 3-hydroxytetradecanoic acid, biofilm formation, flagellar expression, and ultrastructure were altered in the bacteria. Uniformly fatal melioidosis developed as a result of infection with mouse-derived strains; however, the survival rates of mice infected with soil-derived strains prolonged. After primary infection or reinfection with soil-derived strains, the mice developed a low degree of bacterial hepatitis and bacterial colonization in the liver and bone marrow compared with mice that were infected with isogenic or heterogenic mouse-derived strains. We suggest that specific phenotypic and pathogenic patterns can be induced through infection with B. pseudomallei that has been cultured in different (soil versus mouse) environments.

Author Notes

* Address correspondence to Ya-Lei Chen, No. 62, Shen-Chung Rd., Yenchao, Kaohsiung 824. E-mail: dan1001@ms31.hinet.net

Financial support: This work was supported by grants NSC 99-2320-B-017-002-MY3, NSC99-2320-B-075B-001-MY3, VGHKS102-016, and VGHKS99-038.

Authors' addresses: Yao-Shen Chen, Division of Infectious Diseases, Kaohsiung Veterans General Hospital, Kaohsiung, Taiwan, Graduate Institute of Science Education and Environmental Education, National Kaohsiung Normal University, Kaohsiung, Taiwan, and Department of Internal Medicine, National Yang-Ming University, Taipei, Taiwan, E-mail: dan1001@ms31.hinet.net. Wun-Ju Shieh, Centers for Disease Control and Prevention, Infectious Diseases Pathology Branch, Atlanta, GA, E-mail: WShieh@cdc.gov. Cynthia S. Goldsmith, Maureen G. Metcalfe, Patricia W. Greer, and Sherif R. Zaki, Centers for Disease Control and Prevention, Infectious Disease and Pathology Activity, Atlanta, GA, E-mails: csg1@cdc.gov, gnf3@cdc.gov, pwg1@cdc.gov, and sxz1@cdc.gov. Hsin-Hou Chang and Hao Chan, Tzu-Chi University, Department of Molecular Biology and Human Genetics, Hualien, Taiwan, E-mail: hhchang@mail.tcu.edu.tw and b_pseudo@yahoo.com.tw. Ya-Lei Chen, National Kaohsiung Normal University, Biotechnology, Yenchao, Kaohsiung, Taiwan, E-mail: dan1001@ms31.hinet.net.

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