Volume 15, Number 12—December 2009
CTX-M β-Lactamase Production and Virulence of Escherichia coli K1
|Bacterial strain||No. animals||Mean ± SD bacteremia, log CFU/mL blood||No. positive CSF cultures (% meningitis)|
|E44||20||6.95 ± 0.6||17 (85)†|
|Orl-1||16||6.75 ± 0.8||16 (100)†|
|Orl-c||17||6.60 ± 0.5||14 (82)†|
|DH5α-CTX-M1||10||0.10 ± 0.1||0|
*CSF, cerebrospinal fluid.
†p<0.005, significantly higher than the incidence of meningitis by DH5α-CTX-M1 by χ2 test.
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