Alcalá, BelénArreaza, LuisaSalcedo, CeliaUria, Maria JDe La Fuente, LauraVazquez-Moreno, Julio Alberto2019-01-102019-01-102002-12Emerg Infect Dis. 2002;8(12):1512-4.1080-6040http://hdl.handle.net/20.500.12105/6993A mass immunization campaign for 18-month to 19-year-olds was undertaken in Spain in 1996-1997 because of an epidemic of serogroup C meningococcal disease associated with a C:2b:P1.2,5 strain belonging to the A4 lineage. Surveillance for the "capsule-switching" phenomenon producing B:2b:P1.2,5 isolates was undertaken. Of 2,975 meningococci characterized, B:2b:P1.2,5 and B:2b:P1.2 antigenic combinations were found in 18 isolates; 15 meningococci were defined as serogroup B belonging to the A4 lineage.engVoRhttp://creativecommons.org/licenses/by/4.0/AdolescentAdultBacterial CapsulesChildChild, PreschoolElectrophoresis, Gel, Pulsed-FieldHumansInfantMass VaccinationMeningitis, MeningococcalPolysaccharides, BacterialSpainAtribución-4.0 Internacional124986768121512-410.3201/eid0812.020081Emerging infectious diseasesopen access