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Survival curve of chick embryos inoculated at the 14-day-old stage with L. monocytogenes. Wild strains Scott A (▪) and H1 (•) and derivative strains C3 (□) and PP1 (○) were inoculated at doses ranging from 0.5 × 102 to 1 × 102 CFU of bacteria per egg via the chorioallantoic membrane. The survival of embryos was monitored daily for 6 days.
