In this short video, Dr. Offit explains that one of the influenza type B strains has disappeared from circulation. For this reason, 20242025 influenza vaccines will contain only three types of influenza instead of four as in the past few years. The updated trivalent version will include protection against two common type A influenza viruses and one type B influenza virus.
To learn more about vaccines, please visit http://vaccine.chop.edu.