translation.da: De fleste tilfælde af sygdommen i Europa skyldes serogruppe B og C. Siden 1999 har flere lande indført vaccinationsprogrammer mod serogruppe C med anvendelse af en ny generation af konjugerede vacciner.
translation.en: Most instances of the disease in Europe are caused by serogroups B and C. Since 1999, several countries have introduced vaccination programmes against serogroup C, using a new generation of so called “conjugate” vaccines.