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  1. Trivalent Influenza Vaccines | CDC - Centers for Disease Control …

  2. Influenza (Flu) Vaccine Safety | Vaccine Safety | CDC

  3. Influenza A Virus Vaccine, H1n1, Inactivated (Intramuscular Route ...

  4. H1N1 Flu Virus (Swine Flu): Symptoms, Causes, Tests, and Treatments - WebMD

  5. H1N1 flu (swine flu) - Symptoms and causes - Mayo Clinic

  6. Swine Flu (H1N1): What Is It, Causes, Treatments & Prevention

  7. Influenza A (H1N1) 2009 Monovalent Vaccines Questions and …

  8. H1N1 vaccines - World Health Organization (WHO)

  9. What You Need To Know About Swine Flu Vaccine - NPR