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Clin Microbiol Infect. 2005 Jul;11(7):553-8.

Comparative pathogenicity of bacteraemic isolates of Aeromonas hydrophila and Klebsiella pneumoniae.

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Department of Medicine, National Cheng Kung University Medical College, Tainan, Taiwan.


Two bacteraemic isolates of Aeromonas hydrophila and Klebsiella pneumoniae, Ah-2743 and Kp-129, respectively, were studied for their relative pathogenicity in comparison with Escherichia coli ATCC 25922. Ah-2743 caused significantly higher serum levels of tumour necrosis factor-alpha, interleukin (IL)-1beta or IL-6 in human whole blood, and higher serum IL-1beta and IL-6 levels in infected mice, than did Kp-129 and E. coli ATCC 25922. In addition, in BALB/c mice infected by intraperitoneal inoculation, Ah-2743 caused a higher fatality rate (80%) than did Kp-129 (0%). With intramuscular inoculation, Ah-2743 caused more rapid and intense local accumulation of inflammatory cells than did Kp-129, and myonecrosis was present only in Ah-2743-infected mice. These data indicate that Ah-2743 is more pathogenic than Kp-129 or E. coli ATCC 25922 for BALB/c mice. The cellular components or extracellular factors associated with increased cytokine induction and pathogenicity of A. hydrophila in mice merit further investigation.

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