Could any child age 9 years ever need two influenza vaccine doses during an influenza season?

Yes, but only if the 9-year-old meets all of the criteria below:

• they turned 9 years old during the current season, and
• they had received one dose during the current season before turning 9, and
• they have no or unknown history of receiving any previous dose of influenza vaccine before July 1 of the year of the current season.