All people ≥6 months of age are recommended to receive annual influenza vaccine.1,2
A single annual dose of influenza vaccine is recommended for most people. Usually, receiving 2 separate doses in the same season is not recommended, but not contraindicated.
The exception is that 2 doses at least 4 weeks apart are recommended for:
children aged 6 months to <9 years receiving influenza vaccine for the first time
people of any age receiving influenza vaccine for the first time after haematopoietic stem cell or solid organ transplant