Adults: 0.5 ml.
Paediatric population: Children from 3 to 17 years of age: 0.5 ml.
Children less than 9 years of age, who have not previously been vaccinated with a seasonal influenza vaccine: a second dose of 0.5 ml should be given after an interval of at least 4 weeks.
Children less than 3 years of age : the safety and efficacy of INFLUVAC Tetra in children have not been established.
Method of Administration: Immunisation should be carried out by intramuscular or deep subcutaneous injection.
Precautions to be taken before handling or administrating the medicinal product: For instructions for preparation of the medicinal product before administration, see Cautions for Usage.