Are there two types of influenza vaccines licensed in the us?

Yes, there are two main types of influenza vaccines licensed in the U.S.: inactivated influenza vaccines (IIVs), which are made from killed virus, and live attenuated influenza vaccines (LAIVs), which contain weakened virus. IIVs are typically given as an injection, while LAIVs are administered as a nasal spray. Both types aim to provide immunity against the most common strains of the influenza virus. Additionally, there are variations within these categories, including high-dose and recombinant options.