In the July 2014 issue, the piece “Resurrecting the 'yuppie vaccine'” (Nat. Med. 20, 698, 2014) stated that “LYMErix originated in the late 1980s in a laboratory at the Yale School of Medicine at Yale University” and that “[b]y 1992, SmithKline Beecham had licensed the vaccine.” However, it failed to mention the work of a team of German researchers, including Markus Simon and Ulrich Schaible at the Max Planck Institute and Michael Kramer and Reinhard Wallich of the University of Heidelberg, who published initial key findings laying the groundwork for the LYMErix vaccine against Lyme disease. The error has been corrected in the HTML and PDF versions of this article.