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1.
Mycobiology ; : 62-66, 2009.
Article in English | WPRIM | ID: wpr-729207

ABSTRACT

The internal stipe necrosis of cultivated mushrooms (Agaricus bisporus) is caused by the bacterium Ewingella americana, a species of the Enterobacteriaceae. Recently, Ewingella americana was isolated from cultivated white button mushrooms in Korea evidencing symptoms of internal stipe browning. Its symptoms are visible only at harvest, and appear as a variable browning reaction in the center of the stipes. From these lesions, we isolated one bacterial strain (designated CH4). Inoculation of the bacterial isolate into mushroom sporocarps yielded the characteristic browning symptoms that were distinguishable from those of the bacterial soft rot that is well known to mushroom growers. The results of Gram stain, flagellal staining, and biochemical tests identified these isolates as E. americana. This was verified by pathogenicity, physiological and biochemical characteristics, and the results of an analysis of the 16S rRNA gene sequences and the fatty acids profile. This is the first report of the isolation of E. americana from cultivated white button mushrooms in Korea.


Subject(s)
Humans , Agaricales , Enterobacteriaceae , Fatty Acids , Genes, rRNA , Korea , Maillard Reaction , Necrosis , Sprains and Strains
2.
Journal of Korean Medical Science ; : 143-145, 2005.
Article in English | WPRIM | ID: wpr-163761

ABSTRACT

Though the pathogenic significance and the reservoir of Ewingella americana have not been clarified, this organism has caused several pathogenic infections, especially in immunocompromised patients. We report a pneumonia in a patient with chronic renal failure, who had chronic rejection of transplanted kidney. E. americana was identified to be the pathogen of pneumonia with clinical symptoms and signs and radiological examination. As soon as he was treated with ceftriaxone and isepamicin, clinical improvement was followed with no further growth of E. americana or other pathogenic isolates from sputum culture. This suggests to be the case of pneumonia caused by E. americana for the first time in the Korean literature.


Subject(s)
Adult , Humans , Male , Anti-Bacterial Agents/pharmacology , Ceftriaxone/pharmacology , Enterobacteriaceae/metabolism , Enterobacteriaceae Infections/complications , Gentamicins/pharmacology , Kidney Failure, Chronic/complications , Kidney Transplantation , Pneumonia/complications , Sputum/metabolism , Time Factors
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