Agnew, L. L., Guffogg, S. P., Matthias, A., Lehmann, R. P., Bone, K. M., and Watson, K. Echinacea intake induces an immune feedback through altered expression of leucocyte hsp70, increased white colored cell counts and improved erythrocyte anti-oxidant defences. Bensch, K., Tiralongo, J., Schmidt, K., Matthias, A., Bone, K. M.