- Oral delivery and gastrointestinal absorption of soluble glucans stimulate increased resistance to infectious challenge. Rice, P.J., Adams, E.L., Ozment-Skelton, T., Gonzalez, A.J., Goldman, M.P., Lockhart, B.E., Barker, L.A., Breuel, K.F., Deponti, W.K., Kalbfleisch, J.H., Ensley, H.E., Brown, G.D., Gordon, S., Williams, D.L. J. Pharmacol. Exp. Ther. (2005)