Salmonella Enteritidis infection levels in spleen, liver and reproductive tract following challenge of vaccinated and naïve hens four days following intravenous challenge at varying ages through sexual development.

Data are presented as median values with ranges based on five birds per group at each age and number positive for Salmonella out of total number challenged per group. Quantitation was not performed on pooled reproductive tract samples and are shown as Salmonella culture positive or negative following enrichment culture.*Positive only after enrichment.ND = Not done.