Inactivated Influenza Vaccine

Adults: Dosage: For adults and children over 36 months of age, the recommended dose is 0.5 ml. For children aged 6 to 35 months, clinical data remain limited, and either a 0.25 ml or 0.5 ml dose has been used. Children who have not been vaccinated before should receive a second dose at least 4 weeks after the first. If a half dose (0.25 ml) is needed, discard half of the volume in the syringe (up to the mark on the barrel) before giving the injection. The vaccine is given by intramuscular or deep subcutaneous injection. Let it warm to room temperature and shake it well before use. Protection typically develops within 2 to 3 weeks of vaccination. Immunity to the matching or closely related strains usually lasts 6 to 12 months, though this can vary.