The RSV vaccine schedule depends on the age group and risk factors:

• For adults 75 years and older, and those 50-74 with increased risk, the RSV vaccine is given as a single dose. It is not currently recommended as an annual vaccine. Once vaccinated, another dose is not needed at this time. The best time to get vaccinated is late summer or early fall before the RSV season starts.

• For infants, RSV immunization products like nirsevimab are usually administered just before or during the RSV season based on local epidemiology.
  • A single dose is given to infants entering the RSV season.
  • For a second RSV season, a single dose may be given again depending on weight and clinical discretion.
  • Palivizumab for high-risk infants involves a series of 4-5 doses spaced about 28 days apart during the RSV season.

• For babies born in 2025 on or after April 1, an RSV injection is given once within the first year, timed according to the RSV season in their region. This protects about 6 months with a single injection.

In summary: adults get one dose per RSV season as a single shot, not annually yet; infants get either a single or series of doses depending on age and risk; babies born recently get a single injection timed to the RSV season. Local guidelines may adjust timing based on RSV epidemiology.

If there are specific age or risk groups to clarify, that can be addressed further.