Molecular Epidemiology of Serogroup A Meningitis in Moscow, 1969 to 1997
Figure 1. . Annual incidence rates of meningococcal meningitis in Moscow from 1924 to 1998. Incidence rates were extracted from the compilation by Bolshakov (18) and data published in annual reports of the Russian Ministry of Public Health or obtained from 1969 to 1998 by the Central Research Institute of Epidemiology from epidemiologic investigations in Moscow. The percentages of serogroup A meningococci among all meningococci isolated from disease were compiled from various sources [number of strains]: 1924-1969, Bolshakov (18); 1962-1971, Kostyukova (19) ; 1980-1988, Demina (20) [1,000]; and 1993-1998, Koroleva, laboratory records .