Hos disse personer med nedsat immunforsvar skal det overvejes at administrere yderligere vaccine - doser hvis antistofniveauet mod hepatitis B virus overflade- antigen (anti- HBsAg) er mindre end 10 IE/ l.
In vaccinees with an impaired immune system, administration of additional doses of vaccine should be considered if the antibody level against hepatitis B virus surface antigen (anti-HBsAg) is less than 10 IU/ l.