A selection of most recent references that emphasize the role of selenium in immunity:

The pathogenicity of an enteric Citrobacter rodentium infection is enhanced by deficiencies in the antioxidants selenium and vitamin E — SMITH A.D. et al. — 2011 — Infect. Immun., vol. 79, pp. 1471-1478

Thioredoxin reductase-1 negatively regulates HIV-1 transactivating protein Tat-dependent transcription in human macrophages — KALANTARI P. et al. — 2008 — J. Biol. Chem., vol. 283, n°48, pp. 33183-33190

Selenoproteins mediate T cell immunity through an antioxydant mechanism — SHRIMALI R.K. et al. — 2008 — J. Biol. Chem., vol. 283, n°29, pp. 20181-20185

The influence of selenium on immune responses — HOFFMANN P.R. and BERRY M.J.— 2008 — Mol. Nutr. Food Res., vol. 52, pp. 1273-1280

Decreased selenoprotein expression alters the immune response during influenza virus infection in mice — SHERIDAN P.A. et al. — 2007 — J. Nutr., vol. 137, pp. 1466-1471

Suppression of human immunodeficiency virus type 1 viral load with selenium supplementation: A randomized controlled trial — HURWITZ B.E. et al. — 2007 — Arch. Intern. Med., vol. 167, n°2, pp. 148-154

An aged host promotes the evolution of avirulent coxsackievirus into a virulent strain — GAY R.T. et al. — 2006 — PNAS, vol. 103, n°37, pp. 13825-13830