H1N1 influenza is sometimes called “swine flu” because it is usually found in pigs. H1N1 influenza virus vaccine is used to prevent infection caused by the pandemic 2009 H1N1 influenza virus.
H1N1 influenza virus vaccine works by exposing you to a small dose of the virus, which helps your body to develop immunity to the disease. This vaccine will not treat an active infection that has already developed in the body. H1N1 influenza virus injectable vaccine is for use in adults and children who are at least 6 months old.
Children younger than 10 years old should receive two H1N1 influenza virus vaccine shots spaced one month apart. Older children and adults are usually given only one shot without a booster dose.
