Currently, most vaccines are given by injection. However, due to the inherent problems associated with injections, other routes of drug delivery are being researched, among them, the oral route. So far, research into oral vaccination has not differentiated between vaccine uptake by the different parts of the gastro-intestinal tract, such as the small and large intestine. It is likely that following oral vaccine administration, the vaccine is mostly taken up by the lymphoid tissue of the small intestine
