President Obama has declared the swine flu outbreak a national emergency. But if you're still waiting to get the swine flu vaccine, looks like you're going to have to wait a bit longer:

Less than half of the swine-flu vaccine expected to be shipped to doctors, hospitals and clinics in the U.S. this month has been shipped so far. The disease now is widespread in 46 states and the U.S. death toll has passed 1,000.

The delays are occurring around the globe, officials said, and are due to a series of manufacturing difficulties, as vaccine makers scramble to fill vast orders using an old technology that requires growing virus in chicken eggs.

It takes about six to nine months to produce vaccine once a flu strain has been identified.

A total of 11.3 million doses of vaccine had been shipped to U.S. doctors, hospitals, and clinics as of Wednesday, according to the federal Centers for Disease Control and Prevention, out of a total of 14.1 million doses that manufacturers had shipped to warehouses by that time.

By Friday, 16.1 million doses of vaccine for what is also called H1N1 flu had been shipped to warehouses, the CDC said.

The total is far below the government's most recent estimate that by the end of this month, about 28 million to 30 million doses would be ready.

That estimate itself is a revision, made last week, from a prior expectation of about 40 million doses by the end of the month. However, the number of doses shipped is steadily increasing.

Widespread? Yeah, I think I'm coming down with it myself. (I drove my son to the doctor the other day and had to sit in a tiny room with a flu victim who kept coughing into a soggy tissue.) And the nurse practitioner I saw today wouldn't give me a prescription for Tamiflu because I wasn't sick enough - yet:

Influenza is widespread in most of the United States, with the incidence continuing to increase in some states and to decline very slightly in others, the director of the federal Centers for Disease Control and Prevention said Tuesday. The infections are "overwhelmingly" pandemic H1N1 influenza, commonly known as swine flu.

The flu season generally lasts well into May, so many months of uncertainties lie ahead, said Dr. Thomas R. Frieden, speaking at a morning news conference.

Shipments of intranasal swine flu vaccines to providers have begun, and vaccinations began Monday in several states, with a priority for healthcare providers and young children. About 2.4 million doses of the intranasal vaccine FluMist are now available, and states have already ordered 2.2 million doses, Frieden said. Next week, an injectable vaccine will also become available.

So far, vaccine "demand is outstripping supply, but we expect that fairly soon supply will be outstripping demand." Over the next two to three weeks, he added, tens of millions of additional doses will become available.

There have already been some mismatches between supply and demand, Frieden said. "The first couple of weeks are going to be a bit bumpy as we get the supply chain worked out. What we are seeing now is the tap beginning to flow."

Frieden said that the public has three major concerns about vaccination "despite the clear message that vaccine is the best tool to protect against the flu":

* First, he said, many people believe the flu is a mild illness. It is not. "It can make you pretty sick, knock you out for a day or two or three," Frieden said. It can even put people in the hospital or kill them. In a typical flu season, about 35,000 Americans die from complications.

* Second, some people believe that the vaccine is not safe, that corners have been cut in its production, and that it is a new, experimental vaccine. "In fact, none of that is the case," he said. "It is made the same way the flu vaccine is made each year, in the same facilities and by the same companies." And that seasonal vaccine, he added, has "been used safely in hundreds of millions of people. My children will get it [the swine flu vaccine], other public health and societal leaders will get it and have their families get it."

* Third is the concern that the vaccine is arriving too late to do much good. "It's too soon to say it is too late," Frieden said, because no one knows what is going to happen for the rest of the flu season. Even if, say, 5% of the population has contracted swine flu, that still leaves 95% vulnerable. "We don't know what the long flu season is going to hold. We have not had a flu season like this in 50 years" -- since the 1957 Asian flu pandemic that killed 70,000 Americans and 2 million people worldwide.

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(h/t David)

From This Week with George Stephanopolous, some good news for those of us who want to be vaccinated. Remember, you minimize your risk of side effects by getting it a few weeks apart from your regular flu shot. I got my flu shot this week, I'm getting the pneumonia vaccine in two weeks and the swine flu shot two weeks after that:

Amid concerns that H1N1 swine flu vaccine will come too late this flu season, Health and Human Services Secretary told me this morning on ‘This Week’ that the vaccine will be available by the first week of October, 2 weeks earlier than previously expected.

“We are on track to have an ample supply rolling out by mid October, but we may have some early vaccine as early as the first full week in October. And we plan to get the vaccine rolling out the door as fast as it hits the production line.”

This week, DHHS released new research showing that one dose of the H1N1 vaccine will be enough to protect people from the virus rather than multiple doses.

“The earlier doses are probably going to be targeted to health care workers and other high priority groups, but the one dose means that people will be able to have a robust response in about 10 days of getting that first shot and that’s incredibly helpful,” Sebelius said.