Nature Rev. Microbiol. 2, 946–953 (2004)

The citation given to support the statement that the solubility of Fe(OH)2+ at pH 7 is 1.4 × 10−9 was incorrect, and should be:

3. Chipperfield, J. R. & Ratledge, C. Salicylic acid is not a bacterial siderophore: a theoretical study. Biometals 13, 165–168 (2000).

The online version of this article has been corrected.