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Eleven cases of IMD caused by meningococci with the fine type B:P1.18,25-1:F5-1 that occurred between December 2001 and June 2005. The map approximates the geographic locations of the places of residence. The temporal succession of the cases is illustrated at the bottom. Cases 2 and 3 are the subjects of this report and are marked with gray arrows. They are referred to in the text as cases A and B, respectively.
