immune https://www.historyofvaccines.org/content/articles/influenza A and B strains http://www.historyofvaccines.org/content/articles/influenza The History of Vaccines: Influenza influenza https://www.historyofvaccines.org/content/articles/influenza History of the Influenza Vaccines The flu http://www.historyofvaccines.org/content/articles/influenza