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There is no vaccine for it because it hasn't been produced. Yet.
Vaccine making companies can only produce one type of vaccine at a time and it is extremely difficult to switch production after production has already started. That is to say, the WHO has to decide whether vaccine companies should produce vaccines for H1N1 or whether vaccine companies should produce vaccines for the seasonal flu.
If H1N1 doesn't turn out to be a major pandemic, then all those vaccines will be useless. But if it does spread, then those vaccines will be useful. But there's not way of knowing that until it actually happens.
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