influenza vaccine development

Influenza vaccine development involves identifying the most common virus strains expected to circulate each year. Scientists track these strains globally, especially in flu seasons, to choose the best candidates for the vaccine. Vaccines are then created using these strains, either inactivated (killed) or weakened forms. Each year, vaccines may differ due to the virus's ability to change and evolve. After testing for safety and effectiveness, the vaccine is approved for public use, helping to protect against seasonal flu and reduce severe illness and hospitalizations. Regular updates ensure that vaccines remain effective against current virus strains.