The group was identified in 41 cases in 2023: 31 (76%) were group B, six were group Y, two were group W, and two were group C; • 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 unknown1 2 Total B C Y W confirmed Northland 1 0 0 0 2 1 4 Waitemata 2 2 1 0 1 0 6 Auckland 2 0 0 0 3 0 5 Counties Manukau 4 0 3 0 0 0 7 Waikato 4 0 0 0 1 0 5 Lakes 0 0 0 1 1 0 2 Bay of Plenty 0 0 0 0 1 0 1 Tairāwhiti 1 0 0 0 0 0 1 Taranaki 0 0 0 0 0 1 1 Hawke’s Bay 4 0 0 1 0 0 5 Whanganui 2 0 0 0 0 0 2. [...] 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.
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Table of Contents
- Summary 1
- Between 1 January and 31 December 2023 1
- National trends 1
- There was a total of 59 cases of meningococcal disease reported 52 confirmed and 7 probable notified in 2023. There was one death in an adult aged 2029 years due to group B PorA type P1.7-24. 1
- The total number of cases in 2023 was lower than in 2018 2019 and 2022 Figure 2. 2
- Meningococcal disease by ethnic group and age group 3
- Almost half 47 of the meningococcal disease cases in 2023 were of European or Other ethnicity 31 were Māori 19 were Pacific peoples and 3 were Middle EasternLatin AmericanAfrican MELAA. 3
- In 2023 87 1315 of cases aged under 5 years were Māori or Pacific peoples. In comparison the majority 68 1319 of cases aged 1529 years were European or Other ethnicity Figure 3. 3
- Meningococcal disease by group 4
- The group was identified in 41 69 of the 59 cases notified in 2023. Group B was the dominant group type accounting for 31 76 cases six 15 were group Y two 5 were group W and two 5 were group C. 4
- For group B cases the number of cases in 2023 was lower than in 2018 2019 and 2022 but higher than in 2020 and similar to 2021 Figure 4. 4
- 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 respectively. 4
- The number of group W cases in 2023 2 cases was lower than in 2018 2019 and 2020 33 36 and 11 cases respectively and similar to 2021 and 2022. 4
- There were two group C cases reported in 2023. The previous group C case was in 2020. 4
- Meningococcal disease by district and group 5
- Group B trends 6
- Table 2 shows the trends in selected group B PorA types since 2018. The PorA types included in the table are those detected in 2023 as well as those that were most common in previous years. 6
- Nine different PorA types were identified among the 31 group B cases in 2023 and these were geographically dispersed. 6
- The most common PorA types are BP1.7-1214 and BP1.7-24. 6
- The BP1.7-1214 strain was first detected in New Zealand in 2009 and while rare internationally has risen steadily to become a common group B strain. 6
