Were those safety studies or efficacy studies??? I believe those were efficacy studies done to insure that the new master-seed would trigger a sufficient immune response (titer) in humans and they were not ordered because of safety concerns. I don't believe that the seasonal flu vaccine for 2009 required the creation of new master-seeds for the antigens.... but I could be wrong.
Good question, although frankly I think any drug carries some risk, and if it's efficacy hasn't been substantiated, why take that risk? I don't know enough about the exact tests that were being bid on (pesky confidentiality issues) to know which they were for, only that DH felt the drug is "unproven" at this point. I do know that there have been efficacy tests that have also turned up safety issues in the past, but you make a good point as to there being a difference.