The present study aims to evaluate the effect vaccination and oral administration of aqueous extract of artemisia herba alba on the immune status. forty laying hens (Lohman Brown. 1 year-old. body weight 1. https://www.alarecre.com/Disney-The-Nightmare-Before-Christmas-Lock-Shock-and-Barrel-Art-AirPods-Pro-2nd-Gen-Skin-p101716/