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. 2023 Dec 7;27(4):1125–1136. doi: 10.1007/s10123-023-00463-w

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Fig. 2 — Invasive meningococcal disease incidence rates in Portugal from 2003 to 2020. a Incidence rate of IMD per year of onset and per serogroup. The total number of cases has been overlapping the number of confirmed cases over time. “Others” refers to serogroup A, X, E, Z, and capsule null cases. b Average incidence rate of IMD in three successive periods corresponding to three different measures implemented for IMD controlling