Nature Reviews Immunology 11, 865–872 (2011)

On page 872 of the original version of this article, under the subheading “New vaccine development technologies”, there was an error in the sentence that began: “AS04 (GlaxoSmithKline), an adjuvant composed of aluminium salt and the Toll-like receptor (TLR) against MPL”. This sentence should begin: “AS04 (GlaxoSmithKline), an adjuvant composed of aluminium salt and the Toll-like receptor (TLR) agonist MPL”. The authors apologize for this error.