For IIV, the dose is 0.25 mL or 0.50 mL IM (depending on vaccine) for children aged 6 to 35 months 0.5 mL IM for people ≥ 3 years 0.1 mL for people aged 18 to 64 years, given intradermally Children age 6 months to 8 years who have received fewer than 2 influenza vaccine doses or whose influenza vaccination history is unknown should receive 2 doses, separated by at least 4 weeks.