A whopping 40 million doses of swine flu vaccine have expired and will be destroyed. That's believed to be a record loss of flu vaccine.
And it means about a quarter of the swine flu vaccine supply for the U.S. public wasn't used.
Some critics believe federal health officials overreacted to swine flu. But the government says the purchase of 162 million doses of vaccine for the public was to prepare for the worst.
Many health experts had feared the new flu could be the deadly global epidemic they had long warned about, but it ended up killing fewer people than seasonal flu.