Monthly Surveillance Report - May 2006
Tuesday 21st March 2023
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Key Notifiable Disease Trends
- Campylobacter: 1425 campylobacter cases were notified in May 2006 compared to 748 cases notified in the same month of the previous year (Figure 1). Waitemata DHB recorded the highest number of cases (204). Overall, 51 cases were hospitalised. During the incubation period, 70 (4.9%) consumed food at a food premise (131/1425 completed data field), 15 (1.1%) had faecal contact (159/1425 completed data field), 13 (0.9%) consumed untreated water (149/1425 completed data field), 12 (0.8%) had recreational water contact (164/1425 completed data field), 9 (0.6%) had contact with a case (276/1425 completed data field) and 7 (0.5%) had contact with sick animal (134/1425). For the 12 month period ending 31 May 2006, South Canterbury DHB recorded the highest annual incidence rate of 651.7 per 100 000 population (344 cases) compared to the national rate of 416.2 per 100 000 population. Campylobacter notifications doubled during the last three weeks of May 2006. When compared to the previous three years, the “campy season” beginning in November of 2005 to the end of May 2006 represented a 24% increase above the expected notification rate for that season. The increase of 1891 extra notifications for the season was highly significant, p<0.001. Regional differences were not significant. Age groups most likely to be affected by the increase were 15 to 19 years and 40 to 79 years.
- Gastroenteritis: 93 gastroenteritis cases were notified in May 2006 compared to 54 cases notified in the same month of the previous year. The highest numbers of cases were reported from MidCentral (34 cases) DHB. Forty-seven of the notified cases were identified as being part of an outbreak.
- Hepatitis A: seven cases of Hepatitis A were notified in May 2006 compared to zero cases notified in the same month of the previous year. The cases were reported from Waitemata (2), Counties Manukau (2), one each in Northland, Waikato, and Capital and Coast DHBs. One case had been overseas (Samoa) during the incubation period.
- Influenza: during May 2006 (weeks 18 – 21), 222 consultations for influenza-like illness were reported from 64 general practices (on average) in 21 out of 24 health districts. The average weekly consultation rate for May was 19.1 per 100 000 patient population, compared to a rate of 34.6 per 100 000 patient population during the same month last year (Figure 2). Hutt had the highest consultation rate (83.5 per 100 000), followed by Tauranga (54.8 per 100 000). A total of 68 swabs were received for testing during May. Of these, five influenza viruses were isolated, three as A/New York/55/2004 (H3N2) - like, one as A/California/7/2004 (H3N2) - like, and one as influenza B/Shanghai/361/2002-like. In addition, 10 influenza viruses were reported from the laboratory-based (non-sentinel) surveillance in May, eight as influenza A (yet to be sub-typed), and two as A/New York/55/2004 (H3N2) – like.
- Meningococcal disease: based on the earliest date available , nine cases of meningococcal disease were notified during May 2006, of which 7 (77.8%) were laboratory-confirmed, and none were fatal. In comparison, seven cases were notified the previous month, April 2006, and 20 cases were notified during the same month last year May 2005. For the 12 month period ending 31 May 2006, both Waikato and Otago DHBs recorded the highest incidence rate of 8.8 per 100 000 population (28 and 15 cases respectively). The highest age-specific incidence rate was in infants aged less than one year (56.7 per 100 000 population, 31 cases), followed by those in the 1-4 years age group (12.5 per 100 000 population, 27 cases).
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Ph: +64 4 914 0700 Fax: +64 4 914 0770 Email: survqueries@esr.cri.nz |
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