Holt PS, Vaughn LE, Gast RK. Changes in Peyer’s Patch and Cecal Tonsil B Lymphocytes in Laying Hens Following Challenge with Salmonella enterica Serovar Enteritidis. Int. J. Poult. Sci. 2011;10(3):231–237. doi:10.3923/ijps.2011.231.237