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It can vary person to person depending on the health of their immune systems.

  • For trivalent seasonal flu vaccine (including those containing the H1N1/09 Swine Flu vaccine), it usually is under two weeks from the time of the injection for adults to develop full immunity.
  • For the A-H1N1/09 "Swine Flu" monovalent vaccine, immunity in otherwise healthy adult individuals averages 8 to 10 days after the vaccination.
  • For children under 10, a second flu vaccination is required approximately one month after the first one, then within 2-4 weeks after the second vaccination, they can have achieved full immunity.
  • For immuno-compromised patients, there may be a diminished response from their slower functioning immune system, which might leave them unable to achieve full immunity. This may also happen in some people who are temporarily on specific medications that suppress the immune system (such as transplant patients). In both situations, those people should continue to observe all the preventive precautions and measures they used prior to the vaccination, in case they do not develop full immunity. Those with suppressed immune systems may also need to take antiviral medicines like Tamiflu, to help them prevent infection, if they are exposed to someone with the flu.

For adults who are otherwise healthy it takes about 3 weeks after the vaccination to gain full immunity. Children under 10 need a series of two vaccinations since their immune systems are immature. They get the second one approximately one month after the first, then about a month after the second vaccination they will have built immunity. Infants under 6 months old can not be vaccinated, their immune systems are not ready for introduction of pathogens yet.
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