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00925njm 22002777a 4500 dc Alcalá, Belén author Arreaza, Luisa author Salcedo, Celia author Uria, Maria J author De La Fuente, Laura author Vazquez-Moreno, Julio Alberto author 2002-12 A 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. Emerg Infect Dis. 2002;8(12):1512-4. 10.3201/eid0812.020081 1080-6040 Emerging infectious diseases 12498676 http://hdl.handle.net/20.500.12105/6993 Capsule switching among C:2b:P1.2,5 meningococcal epidemic strains after mass immunization campaign, Spain