Key Takeaways GSK vaccine sales fell in the U.S. as Shingrix and Arexvy declined sharply in early 2025.Revised ACIP guidance narrowed Arexvy's eligible population, hurting sales momentum.Penmenvy approval and pipeline efforts may aid growth, but benefits will take time.GSK plc (GSK) is one of the key vaccine makers in the world, marketing vaccines to help prevent infectious diseases like Respiratory Syncytial Virus or RSV, meningitis, shingles, hepatitis and many more.GSK’s Vaccine sales are declining in th ...