Sakou, Irine-Ikbale, Tzanakaki, Georgina, Kremastinou, Jenny, Tsolia, Maria N., Sioumala, Maria, Barbouni, Anastasia, Kyprianou, Miltiades, Papaevangelou, Vana, Tsitsika, Artemis, Blackwell, Caroline C., Kafetzis, Dimitris. Elsevier; 2009. Investigation of serum bactericidal activity in childhood and adolescence 3-6 years after vaccination with a single dose of serogroup C meningococcal conjugate vaccine.