Flu In May 2024. Learn about flu risks, vaccination, prevention strategies, and how to manage symptoms effectively with this comprehensive flu season guide. The biggest drop in effectiveness this year may be the result of fewer cases from a(h1n1)pdm09, a strain that has spread since the h1n1 swine flu pandemic in 2009.
National center for immunization and respiratory diseases (ncird) fluview weekly u.s. The flu viruses can change from one winter to the next.