The effect of vaccination with a Salmonella enteritidis aroA mutant on early cellular responses in caecal lamina propria of newly-hatched chickens., Van Immerseel, Filip, De Buck Jeroen, De Smet Isabel, Mast Jan, Haesebrouck Freddy, and Ducatelle Richard , Vaccine, 2002 Jul 26, Volume 20, Issue 23-24, p.3034-41, (2002)