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In otherwise healthy adults, it usually takes around 12-14 days for the flu vaccines to create the immune response needed for immunity. The Swine Flu vaccine was made from a good sample and in most healthy adults it created immunity in 8-10 days.

People with immunocompromising disorders can sometimes never develop full immunity or it may take longer and/or booster shots. It is recommended that they get the vaccines made from the inactivated virus particles and that they continue to use good hand washing and other protective measures, in case their systems do not create full immunity.

Children under 10 need two flu vaccinations to develop immunity. They are given the first vaccination, then in a month they need a second vaccination. After approximately 2-3 weeks from the second vaccination, if their immune systems are otherwise normal, they will be protected for life against that very specific organism.

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