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Urease Production Correlates with Possession of the trh Gene in Vibrio parahaemolyticus Strains Isolated in Thailand

Orasa Suthienkul, Masanori Ishibashi, Tetsuya lida, Nujjaree Nettip, Suvanee Supavej, Boonchuay Eampokalap, Masanao Makino and Takeshi Honda
The Journal of Infectious Diseases
Vol. 172, No. 5 (Nov., 1995), pp. 1405-1408
Published by: Oxford University Press
Stable URL: http://www.jstor.org/stable/30133793
Page Count: 4
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Urease Production Correlates with Possession of the trh Gene in Vibrio parahaemolyticus Strains Isolated in Thailand
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Abstract

A total of 489 Vibrio parahaemolyticus isolates from patients in Thailand with diarrhea was examined for the presence of thermostable direct hemolysin (TDH) and TDH-related hemolysin genes (tdh and trh, respectively), their serovars, TDH production, and urease activity. Of the strains, SWc were positive only for the tdh gene, 6% for both trh and tdh genes, and 2% for the trh gene only. Thirty-seven (8%) of the 489 isolates were positive for urease production. Of special interest, all urease-positive strains possessed the trh gene, and conversely, urease-negative strains lacked the gene, indicating that urease production by V. parahaemolyticus strains strongly correlates with the possession of the trh gene. Thus, the urease-positive phenotype of V. parahaemolyticus can be considered an indication of virulent (trh-possessing) V. parahaemolyticus strains in clinical diagnosis.

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