Monthly Notifiable Disease Surveillance Report - Sep 2009

Friday 20th September 2019


Key notifiable disease trends

  • Gastroenteritis: 135 cases of gastroenteritis were notified in September 2009 compared to 45 notified cases in the same month of the previous year. The highest numbers of cases were reported from West Coast DHB (59) followed by Waitemata DHB (14).The highest number of cases was recorded by those in the over 70 years age group (44). Seven completed gastroenteritis outbreaks were reported involving 122 cases and 23 interim gastroenteritis outbreaks were reported involving 83 cases.
  • Leprosy: One laboratory confirmed case of leprosy was notified in September 2009. The case was 15-19 year old who had been to Samoa during the disease incubation period.
  • Listeriosis: Six listeriosis cases were notified during September 2009, one of which was later made not a case. Of the five of the remaining cases, all were laboratory confirmed and all were hospitalised. Four cases were perinatal listeriosis, all were from Waikato DHB. One infant died after being delivered at 20 weeks gestation, one infant was delivered at 37 weeks and survived, and one infant presented with bloody diarrhoea in their first week of life and survived. The remaining perinatal case was a mother who presented with symptoms at 33 weeks gestation. The infection did not result in either pre-term delivery or intrauterine death. The non-perinatal case occurred in a 20-29 year old from Waitemata DHB who had an underlying illness and was receiving immunosuppressive medication. No common source of infection has been found between the cases.
  • Measles: 53 cases of measles (19 confirmed, 24 probable, and 10 under investigation) were notified in September 2009 compared to 75 notifications in the preceding month and zero notifications in the same month of the previous year (Figure 1). There were 14 laboratory confirmed cases. The highest number of cases was reported by Canterbury DHB (38 cases). Four cases were hospitalised. For more information on the measles situation in New Zealand, including the age, ethnicity, and vaccination status of cases, please refer to the Measles Report available from http://www.surv.esr.cri.nz/surveillance/WeeklyMeaslesRpt.php.
  • Meningococcal disease: Based on the earliest date available1, 13 cases (5 laboratory-confirmed) of meningococcal disease were notified during September 2009. In comparison, 26 cases were notified the previous month, August 2009, and 13 cases were notified during the same month last year, September 2008. For the 12 month period ending 30 September 2009, Tairawhiti DHB recorded the highest incidence rate (10.9 per 100 000 population, 5 cases), followed by Wairarapa DHB (7.5 per 100 000, 3 cases) and Hawke's Bay DHB (7.2 per 100 000, 11 cases). The highest age-specific incidence rate was in infants aged less than one year (42.1 per 100 000 population, 27 cases), followed by those in the 1-4 years age group (14.8 per 100 000, 35 cases) and those in the 15-19 years age group (7.1 per 100 000, 23 cases).
  • Mumps: 10 cases of mumps (6 probable, and 4 under investigation) were notified in September 2009 compared to five notified cases in the same month of the previous year. The cases were reported from Wairarapa (3), Capital and Coast (2), Auckland (1), Taranaki (1), Whanganui (1), Canterbury (1) and West Coast (1) DHBs. The highest number of cases was recorded by those in the 5-9 years and 30-39 years age groups (3 cases each). Of the 6 probable cases, one had received one dose of vaccine (as appropriate for their age), one had received two doses of vaccine, one was reported as being vaccinated but no dose information was available, one was reported to be unvaccinated, and the immunisation status of the two remaining cases is unknown.
  • Non-seasonal influenza: In New Zealand, non seasonal influenza became notifiable on 29 April 2009. Twenty-two cases of non seasonal influenza A (H1N1) were notified in September 2009 (20 confirmed and 2 under investigation) compared with 299 cases in the preceding month. There were 10 hospitalised cases. The highest number of cases was reported by Waitemata DHB (6 cases), followed by Bay of Plenty DHB (4 cases). For the latest information on the non seasonal influenza A (H1N1) situation in New Zealand see http://www.moh.govt.nz/influenza-a-h1n1.
  • Pertussis: 129 cases of pertussis were notified in September 2009, compared to 111 notifications in the preceding month and 41 notifications in same month of the previous year (Figure 2). There were 45 (34.9%) laboratory-confirmed cases. The highest numbers of cases were reported by Canterbury DHB (36 cases), followed by Waikato (27 cases) and Waitemata (20 cases) DHBs. For the 12 month period ending 30 September 2009, the highest incidence rates were reported from West Coast (86.5 per 100 000 population, 28 cases) and Nelson Marlborough (70.7 per 100 000, 96 cases) DHBs compared to a national rate of 27.7 per 100 000 population. The current 12-month rate by age group was highest amongst infants aged less than one year (156.1 per 100 000 population, 100 cases), followed by children in the 1-4 years age group (50.0 per 100 000, 118 cases).
  • Yersiniosis: 39 yersiniosis cases were notified in September 2009 compared to 27 notifications in the preceding month and 33 cases in the same month of the previous year. Four cases were hospitalised. Canterbury DHB had the highest numbers of cases (8 cases) followed by Auckland (6) and Waitemata (5) DHBs. The highest number of cases was in the 40-49 years age group (8 cases) followed by the 50-59 years age group (6).


1
The ‘earliest’ date refers to the earliest recorded date for the case (onset or hospitalisation date rather than report date, if available). ‘Earliest’ date, as opposed to ‘report date’ alone, is used throughout the analysis of meningococcal disease notification data.

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Report:

Monthly Notifiable Disease Surveillance Report - Sep 2009

Tables:

Monthly National Totals - Sep 2009

Monthly DHB Totals - Sep 2009

Monthly Rolling Totals - Sep 2009

 

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Monthly Notifiable Disease Surveillance Report - Sep 2009

Tables:

Monthly National Totals - Sep 2009

Monthly DHB Totals - Sep 2009

Monthly Rolling Totals - Sep 2009

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