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Published on: October 15, 2013
Pseudomonas pseudomallei and melioidosis, with special reference to the status in Thailand
1National Institute of Health, Soi Bamrasnaradura Hospital, Amphur Muang, Nonthaburi, Thailand.
Abstract:
Melioidosis is a long-known disease since 1912, but only quite recently we have obtained the knowledges about its actual clinical and epidemiological features. The disease is so unique in having a wide spectrum of disease course and clinical manifestation. The causative agent, P. pseudomallei, is free-living bacterium in the natural environments (soil and surface water) of tropical and subtropical areas. Just like legionnaires' disease, melioidosis is a good example of infectious disease in which pneumonia is produced by inhalation of contaminated soil dusts or water droplets. The infection becomes dormant for years, but with a chance of recrudescence under a variety of insults to the host resistance. The disease, may it be acute or chronic, will be symptomatically confused with malaria, typhoid fever, leptospirosis, septicemia caused by other gram-negative bacteria, tuberculosis and mycotic infections. Isolation of the causative agent from clinical specimens is the only reliable method for diagnosis. Because of the increasing clinical awareness and the development of diagnostic methods, the reported cases of melioidosis have numbered almost one thousand in Thailand during the past 20 years. This country has now the most ample clinical experiences on melioidosis. We have reviewed the history of melioidosis research from bacteriological, immunological, clinical and epidemiological viewpoints, especially including the recent reports in Thailand.
Insights
Melioidosis, caused by P. pseudomallei, presents diverse clinical features and can remain dormant. Diagnosis relies on isolating the bacterium, with Thailand having extensive experience.
Area of Science:
- Medical Microbiology
- Infectious Diseases
- Epidemiology
Background:
- Melioidosis, known since 1912, has recently seen advancements in understanding its clinical and epidemiological aspects.
- The causative agent, Burkholderia pseudomallei (P. pseudomallei), is an environmental bacterium found in soil and water.
- Infection can result from inhaling contaminated dust or droplets, leading to pneumonia, and may remain dormant with potential for recrudescence.
Purpose of the Study:
- To review the history of melioidosis research.
- To highlight clinical and epidemiological features, particularly recent findings in Thailand.
- To emphasize diagnostic methods and challenges.
Main Methods:
- Literature review of bacteriological, immunological, clinical, and epidemiological studies.
- Analysis of reported cases and clinical experiences, especially from Thailand.
- Focus on diagnostic methods, including isolation of P. pseudomallei.
Main Results:
- Melioidosis exhibits a wide spectrum of clinical manifestations and disease courses.
- P. pseudomallei is an environmental bacterium, and infection can mimic other diseases.
- Thailand has accumulated significant clinical experience, with nearly a thousand reported cases in 20 years.
Conclusions:
- Accurate diagnosis of melioidosis relies on isolating the causative agent.
- Increased clinical awareness and improved diagnostics have led to more reported cases.
- Thailand possesses extensive clinical experience and data on melioidosis.
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