A mistake at our UK printers meant that the News story ‘Drugs could head off a flu pandemic — but only if we respond fast enough’ (Nature 436, 614–615; 2005) contained an error in European copies of Nature. This said that even if a flu outbreak was controlled, up to half of Thailand's population would be infected. In fact, there would be only 200 cases in this scenario. In addition, a comment about US spending on anthrax surveillance was attributed to Ben Schwartz when it was actually made by Mark Lipsitch of Harvard University.