Diphtheria outbreak--Russian Federation, 1990-1993.

Despite high levels of vaccination coverage against diphtheria, an ongoing outbreak of diphtheria has affected parts of the Russian Federation since 1990; as of August 31, 1993, 12,865 cases had been reported. This report summarizes epidemiologic information about this outbreak for January 1990-August 1993, and is based on reports from public health officials in the Russian Federation.