Finally, the Nature study was published in May, led by University of Wisconsin-Madison researcher Yoshihiro Kawaoka.

CNN: Bird flu research resumes -- but not in U.S.

It emerged in December that the authorities in the United States had recommended withholding from general publication the detailed results and methods of the study, as well as those of a second one led by Yoshihiro Kawaoka, of the University of Wisconsin-Madison. (This also created transmissible strains, albeit less virulent ones.) Both studies had received grants from America's National Institutes of Health (NIH).

ECONOMIST: The saga over research into bird flu reaches a climax