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Following the use of an extensive immunisation campaign targeting the population between ages 2 and 19 in the majority of the Autonomous Communities (Regions), for the purpose of controlling the "outbreak or epidemic wave" caused by serogroup C in 1996-97, there was great interest in ascertaining the situation of the well-known epidemic strain C:2b:P1.2.5, which had been identified as the cause of the changes brought about in the epidemiological profile of meningococcal disease in Spain, as this would enable us to analyse some of the possible future tendencies of this disease in our country. An analysis of the situation in the first 10 months of 1999 reveals that we have reverted to figures similar to those which, both insofar as the number of cases as well as the frequency of serogroups, were observed in Spain at the beginning of the decade of the nineties, although the epidemic strain C:2b:P1.2.5 represents 56% of the total cases of serogroup C. The strains of serotype 2a, very frequent in serogroup C in European countries, continue to represent a minority in Spain. Finally, it is of interest to mention the appearance of antigen variants which could be the result of processes of intra-specific genetic recombination and which would presumably have been selected in terms of their evolutive advantages.

Situación de la cepa epidémica de Neisseria meningitidis C:2b:P1.2,5 después de la vacunación A+C