The same authors who claimed their study results were so convincing that it was no longer ethical to recommend surgical masks for the care of patients with influenza have now admitted that their analysis was flawed, and that their study (when analyzed correctly) shows no difference between N95s and surgical masks for protection of health care workers from influenza transmission (a conclusion now consistent with the JAMA study by Loeb, et. al.).
These data were cited as being of major import in the IOM report, which of course was a major determinant in the CDC decision to stick with N95s for all care of those with ILI during the H1N1 influenza pandemic.
I wasn't at the IDSA presentation where this retraction occurred, but I imagine it involved one of the authors going up to the microphone, meekly stating, "never mind", and rushing off to catch a flight back to Australia.