
The newest single dose vaccine makes adults immune to swine flu after just one shot of the vaccine. In the past, most experts expected that two shots of a vaccination given three weeks apart would be required. A single vaccine means that stockpiles of the medicine may go twice as far. Note that some high risk children will still be required to get both shots of the H1N1 vaccine.
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A separate report in the New England Journal suggested that European manufacturers might get away with an even smaller dose. Novartis Vaccines added what's called an "adjuvant", or immune-boosting chemical, to its version of the swine flu shot and found a 7.5-microgram dose was effective. It did, however, have more side effects like injection-site pain. Many countries allow flu vaccines with adjuvants to sell every year, but the US has never approved such an adjuvant-containing flu shot.
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These results came from clinical trials of the "CSL" H1N1 swine flu vaccine from Australia. About 40% of the 195 million doses of swineflu vaccinations being purchased by the US are to be made by CSL. US data appears to confirm those findings and show the protection starts rapidly. Note that these reports swine flu vaccine reports center on adults only, studies on children aren't finished at this time.
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US Federal officials do not want to discourage healthy adults from getting the shot. But the CDC is only specifically recommending swineflu vaccinations for people at high risk for complications such as medical workers, pregnant women, children under 2 years old, parents of babies, or anyone with existing conditions that could make an influenza infection fatal.
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