A national poll (PDF) by the Harvard School of Public Health found that the majority of adults who've tried to get the H1N1 swine flu vaccine for their children or themselves have been unable to do so.
Anecdotal reports of vaccine shortages have been widespread in recent weeks. If you're among the people who have had trouble getting vaccinated, this new survey showed you weren't alone.
Harvard's Robert J. Blendon, who co-directed the poll, said two-thirds of all parents and "high-risk" adults nationwide who want the vaccine have failed in their search.
"It's not only that they couldn't get it — they couldn't even find location names of where it might be available," Blendon said. "So I think that just adds to your frustration, if you just go from site to site and you can't find the place where they tell you if it's there or it's not."
Still, Blendon said that roughly 90 percent of people who have been unable to get the vaccine so far said they plan to keep trying.
The Centers for Disease Control said that vaccine production is continuing, but that supplies remain limited for now.
This program aired on November 6, 2009. The audio for this program is not available.