Monthly Notifiable Disease Surveillance Report - Aug 2009

Friday 20th September 2019


Key notifiable disease trends

  • Brucellosis: One case of brucellosis still under investigation was notified in August 2009 from Otago DHB. The case will be denotified as they initially sought medical care for their illness in Europe and attended a New Zealand medical practitioner for follow-up serology. Although still under investigation, an alternative diagnosis is likely.
  • Hazardous substances injury: One case of hazardous substances injury was notified in August 2009. The case was a 20-29 year old female from MidCentral DHB who was hospitalised following accidental poisoning with elemental mercury. The case is still under investigation and waiting for laboratory-confirmation.
  • Legionellosis:13 cases of legionellosis were notified in August 2009 compared to three notified cases in the same month of the previous year (Figure 1). The cases were from Counties Manukau (6), Waitemata (4), Auckland (2) and Northland (1) DHBs. One case was hospitalised.The cases were in the following age groups: 40-49 years (3), 60-69 years (3), 20-29 years (2), 30-39 years (2), 50-59 years (2) and 70+ years (1). The species involved was identified only for one case, Legionella dumoffii.
  • Measles: 86 cases of measles (55 confirmed, 15 probable, and 16 under investigation) were notified in August 2009 compared to 88 notifications in the preceding month and one notification in the same month of the previous year. There were 40 laboratory confirmed cases. The highest number of cases was recorded from Canterbury DHB (54 cases) followed by Waitemata DHB(11 cases). Six cases were hospitalised. One outbreak (still ongoing) involving over 4 cases was reported from Auckland DHB. For more information on the measles situation in New Zealand, including the age, ethnicity, and vaccination status of cases, please refer to the Measles Weekly Report available from http://www.surv.esr.cri.nz/surveillance/WeeklyMeaslesRpt.php.
  • Meningococcal disease: Based on the earliest date available1, 25 cases (20 laboratory-confirmed) of meningococcal disease were notified during August 2009. In comparison, 22 cases were notified the previous month, July 2009, and 18 cases were notified during the same month last year, August 2008. For the 12 month period ending 31 August 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 (6.5 per 100 000, 10 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 (12.7 per 100 000, 30 cases) and those in the 15-19 years age group (6.5 per 100 000, 21 cases).
  • Mumps: 13 cases of mumps (5 confirmed, 3 probable, and 5 under investigation) were notified in August 2009 compared to five notified cases in the same month of the previous year. The cases were reported from Canterbury (4), Counties Manukau (2), Capital and Coast (2), Northland (1), Auckland (1), Bay of Plenty (1), Wairarapa (1), and Otago (1) DHBs. The highest number of cases was recorded by those in the 5-9 years and 40-49 years age groups (3 cases each). Of the five confirmed cases, one had received one dose of vaccine (as appropriate for their age), three were reported to be unvaccinated (one child aged 5-9 years and two adults) and the immunisation status of the remaining adult case is unknown. One outbreak (interim report) involving 2 cases at a preschool in Canterbury DHB was reported.
  • Non-seasonal influenza: In New Zealand, non seasonal influenza A (H1N1) became notifiable on 29 April 2009 and 298 cases of influenza A (H1N1) were notified in August 2009 (296 confirmed and 2 under investigation).The preceding month reported 2101 cases. There were 93 hospitalised cases. The highest number of cases was recorded from Canterbury (47 cases) followed by Otago (29 cases) and Tairawhiti (27 cases) DHBs. 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: 122 cases of pertussis were notified in August 2009, compared to 107 notifications in the preceding month and 34 notifications in same month of the previous year (Figure 2). There were 23 (18.9%) laboratory-confirmed cases. The highest numbers of cases were reported from Canterbury (30 cases) and Waikato (22 cases) DHBs. For the 12 month period ending 31 August 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 25.9 per 100 000 population. The current 12 month rate by age group was highest amongst infants aged less than one year (153.0 per 100 000 population, 98 cases), followed by children in the 1-4 years age group (49.2 per 100 000, 116 cases).
  • Rickettsial disease: One laboratory-confirmed case of murine typhus was notified in August 2009. The case was a 40-49 year old female from Waitemata DHB and was hospitalised. The case had not travelled overseas during the disease incubation period and the probable source of the disease is thought to be contact with rats or compost.


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 - Aug 2009

Tables:

Monthly National Totals - Aug 2009

Monthly DHB Totals - Aug 2009

Monthly Rolling Totals - Aug 2009

 

DOWNLOADS

Monthly Notifiable Disease Surveillance Report - Aug 2009

Tables:

Monthly National Totals - Aug 2009

Monthly DHB Totals - Aug 2009

Monthly Rolling Totals - Aug 2009

Ph: +64 4 914 0700 Fax: +64 4 914 0770 Email: survqueries@esr.cri.nz