Nat. Biotechnol. 28, 671–678 (2010); published online 8 July 2010; corrected after print 7 February 2012

In the version of this article initially published, on p. 671, column 2, the authors state: “Merck has donated three million doses of Gardasil to the Program for Appropriate Technology in Health (PATH) for demonstration trials14. Its Gardasil Access Program aims to extend this support to eight LMCs15.” It should have read: “Merck donated about 130,000 doses to PATH for demonstration studies in India, Peru and Vietnam14. Through the Gardasil Access Program, Merck aims to extend its support to LMCs and has pledged to make 3 million doses of vaccine available to eligible countries15.” In addition, reference 14 should have been Tsu, V. PATH/Seattle, personal communication (2011), rather than Harner-Jay et al. J. Pharm. Sci. (2008).