Flu A also has two subtypes that routinely circulate, H1N1 and H3N2. As for getting the flu twice in once season, Dr. Amesh Adalja, an infectious disease expert at Johns Hopkins Center for Health ...

Based on the data presented, the committee agreed that there was a need to change the influenza A/H3N2 virus strains from the 2024-2025 formula. Recommendations on the strain composition of ...