Hypersensitivity to trivalent inactivated influenza virus, any of the excipients of Influvac and to residues of eggs, chicken protein (Influvac does not contain >1 mcg ovalbumin/dose), formaldehyde, cetyltrimethylammonium bromide, polysorbate 80 or gentamicin.
Immunisation shall be postponed in patients with febrile illness or acute infection.