Gast , R.K. et al. 2011. Frequency and Magnitude of Internal Organ Colonization Following Exposure of Laying Hens to Different Oral Doses of Salmonella enteritidis. International Journal of Poultry Science. 10, 4 (Mar. 2011), 325–331. DOI:https://doi.org/10.3923/ijps.2011.325.331.