Table 2. Incidence of meningitis in a newborn mouse model by Escherichia coli strain, France*.

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.