In this issue of the Journal of Virology, we publish a paper by Troy C. Sutton and colleagues from the University of Maryland, Virginia-Maryland College of Veterinary Medicine, and the Istituto Zooprofilattico Sperimentale delle Venezie in Padova, Italy reporting sequence changes in highly pathogenic avian influenza virus A H7N1 (A/H7N1) associated with airborne transmission in mammals (1).…