This is also the first year that we could have had an alternative. People with egg allergies get a different shot, one grow in animal cells instead of eggs, that doesn’t seem to get these problematic mutations. For the 2016-17 flu season, the U.S. had a cell-based vaccine that had initially been in eggs, so it had the same issues as the standard vaccine. But this year, the cell-based vaccine was only ever grown in animal cells. That might make it more effective than any egg-originating vaccine, though we won’t be sure until we get more analytical data toward the end of the season.