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Subject Younger kids will need 2 swine flu shots
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Original Message WASHINGTON - Studies of the new swine flu vaccine show children 10 and older will need just one shot for protection against swine flu but younger kids almost certainly will need two.

Protection kicks in for older children within eight to 10 days, just like it does for adults, the National Institutes of Health announced Monday.

But younger children aren't having nearly as robust an immune reaction to the swine flu shot, and it appears they'll need two shots 21 days apart, said Dr. Anthony Fauci, head of NIH's National Institute of Allergy and Infectious Disease.
That's not a surprise, since the very young often need two doses of vaccine against regular winter flu the very first time they're immunized against that version of influenza, too, Fauci stressed.

"This is acting strikingly similar to seasonal flu" vaccine, Fauci said. "Overall, this is very good news for the vaccination program."

Lining up twice for shots
It means that most people in the U.S. will have to line up for influenza vaccinations twice this year instead of three times once for the regular winter flu shot and a second time to be inoculated against swine flu, what doctors call the 2009 H1N1 strain.

But here's a twist: If a very young child happens to be getting their first-ever seasonal flu vaccination this year, that tot would need a total of four shots two against regular flu and two against swine flu.

Once swine flu shots start arriving next month, it will be OK for kids or people of any age to get one in each arm on the same visit, said Dr. Anne Schuchat of the Centers for Disease Control and Prevention. But doctors already have supplies of regular flu vaccine, and the CDC wants people to go ahead and get that first inoculation out of the way now.

"This is going to be a complicated flu season," Schuchat warned.

The children's study found that 76 percent of 10- to 17-year-olds showed good protection with one dose of H1N1 vaccine. That's similar to protection from the regular winter flu vaccine and doesn't mean the other quarter didn't respond at all, just not quite as robustly.

But just over a third of 3- to 9-year-olds had a good response to the swine flu shot, and only a quarter of babies and toddlers ages 6 months to 3 years, Fauci said.

That response was measured eight to 10 days after the shot, and flu protection usually builds over several weeks so the numbers could improve somewhat, he said but he wasn't optimistic that the under-10 crowd would be able to skip the booster dose.


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Younger children simply "don't have as mature an immune system," Fauci explained. So a first dose of vaccine against a flu strain they've never experienced acts as an introduction to it, while a booster shortly thereafter revs up their immune response.

Monday's study didn't examine FluMist, the nasal-spray flu vaccine. The first 3.4 million doses of swine flu vaccine to be shipped early next month will be the FluMist version, which can be used by healthy people ages 2 to 49. But health officials said they expected FluMist to act similarly in all age groups.

The vast majority of swine flu vaccine will be the shot version, and about 45 million doses of the shots are expected to be available around Oct. 15, with more shipping each week. The U.S. has ordered a total of 195 million doses, enough to meet anticipated demand.
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