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Assessment of the virulence of the six studied L. monocytogenes strains in the chicken embryo model. The survival curve for the chick embryos is shown. L. monocytogenes cells were inoculated into 14-day-old chick embryos (0.3 × 102 to 1 × 102 CFU per egg) via the chorioallantoic membrane. The survival of the embryos was monitored daily for 6 days.
