Invasive Meningococcal Disease Report January–December 2023 Summary National trends

The group was identified in 43 cases in 2023: 31 (72%) were group B, six were group Y, three were group W, two were group C and one was group E; • the cases were geographically dispersed. [...] Number of meningococcal disease cases by month and year, 2018–2023 30 25 20 15 10 5 0 1 3 5 7 9 11 1 3 5 7 9 11 1 3 5 7 9 11 1 3 5 7 9 11 1 3 5 7 9 11 1 3 5 7 9 11 2018 2019 2020 2021 2022 2023 Year/month The total number of cases in 2023 was lower than in 2018, 2019, and 2022 (Figure 2). [...] Cumulative number of group B meningococcal disease cases by month, January 2018 to December 2023 70 60 50 40 30 20 10 0 Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Month 2018 2019 2020 2021 2022 2023 The number of cases due to group Y in 2023 (6 cases) was lower than in 2018, 2019 and similar to 2022 (16, 16, and 8 cases, respectively) and higher than in 2020 and 2021 (2 and 0 cases, respectiv. [...] Number of meningococcal disease cases by group and district, 2023 Group Group Not lab- District Total B C E Y W unknown 1 confirmed Northland 1 0 0 0 0 3 0 4 Waitemata 2 2 0 1 0 1 0 6 Auckland 2 0 0 0 0 3 0 5 Counties Manukau 4 0 0 3 0 0 0 7 Waikato 4 0 0 0 0 1 0 5 Lakes 0 0 0 0 1 1 0 2 Bay of Plenty 0 0 0 0 0 1 0 1 Tairāwhiti 1 0 0 0 0 0 0 1 Taranaki 0 0 0 0 0 0 1 1 Hawke’s Bay 4 0 0 0 1 0 0 5 Wh. [...] Number of group B meningococcal disease cases by selected PorA type, 2018 to 2023 Year PorA type 2018 2019 2020 2021 2022 2023 P1.7-12,14 3 14 3 12 14 11 P1.7-2,4 16 19 9 8 14 8 P1.22,14 3 5 0 2 2 4 P1.19-1,15 0 0 0 0 1 2 P1.22,14-49 0 0 0 0 0 2 P1.7,16-26 2 4 0 1 2 1 P1.19,15 0 1 1 1 0 1 P1.7,4-46 0 0 0 0 0 1 P1.18-1,30-8 0 0 0 0 0 1 P1.7-36,14 0 0 2 0 2 0 P1.18-1,34 3 3 0 0 2 0 P1.5,2 0 0 0 1 1.