According to the Washington Post:

The Strategic National Stockpile, created during the Clinton administration a decade ago to provide a federally coordinated response to disasters, maintains a massive collection of antibiotics, vaccines, gas masks and other supplies in a dozen secret locations. The program was expanded in 2004 to include drugs needed in a pandemic and is designed to link with stockpiles kept by state governments, pharmaceutical companies and federal agencies.
But the District, Maryland and 26 other states are 10 million dosages short of the levels that the federal government has determined they should have in their stockpiles for a pandemic. The drugs — in this case, Tamiflu and Relenza — would be used to treat the illness, not to prevent it.

More specifically:

Along with the federal doses, the plan called for states together to create a cache of 30 million doses, but they have fallen short of that figure by one-third. Maine, for example, which has three confirmed cases of swine flu, has stockpiled no medications.
The District and Maryland fell short by hundreds of thousands of doses. Virginia is one of 15 states that has stockpiled more doses than called for in the federal guidelines. In the District, health officials stockpiled about 76 percent of the recommended doses, and in Maryland, the figure was about 70 percent, although officials there said they think they will be fully stocked by this fall.

Here is a question for everyone: Are preparing for and responding to epidemics (real ones, not fake ones like obesity) legitimate functions of government? I am very cynical about the ability of the government to do anything well. Yet, I go back and forth on this issue. Is responding to epidemics like providing a national defense? I would be interested in what people think about this.