Ibrahim M S Shnawa, Mahdi H M AL-Amar. Lapin Challenge Model for Laboratory Development of an Oral Carbohydrate Based Vi Vaccine for Typhoid. IJSBAR. 2023;70(1):337-344. Accessed November 3, 2025. https://www.gssrr.org/JournalOfBasicAndApplied/article/view/16210