Der skal udvises forsigtighed, når vaccinen gives til personer med kendt overfølsomhed (ud over anafylaktisk reaktion) over for det aktive stof eller over for et eller flere af hjælpestofferne, over for thiomersal og over for sporstoffer fx af æg, kyllingeprotein, gentamicinsulfat.
Caution is needed when administrating this vaccine to persons with a known hypersensitivity (other than anaphylactic reaction) to the active substance, to any of the excipients, to thiomersal and to residues e. g. eggs, chicken protein, gentamicin sulphate.