Bacterial burden in placenta and pups delivered pre term or at term after <i>S.</i> Enteritidis enterocolitis.

A group of 20 pregnant mice received 20 mg of streptomycin 24 h before intragastric infection with 3–4×103 CFU of S. Enteritidis (day 15 of gestation). Animals were allowed to deliver normally. Pups and placentas were removed and bacterial loads were analyzed as described in materials and methods. (a)Median (range). *p<0.01; ‡p<0.05 in comparison with the at term delivered group. Bacterial burden in placenta and pups delivered pre term or at term after S. Enteritidis enterocolitis.