Monthly Notifiable Disease Surveillance Report - Apr 2009

Wednesday 18th September 2019


Key notifiable disease trends

  • Chemical poisoning from the environment: One probable case of chemical poisoning from the environment was notified in April 2009. This male case from Bay of Plenty DHB aged 40-49 years had been hospitalised following possible accidental ingestion of cyanide paste.
  • Cryptosporidiosis: 52 cryptosporidiosis cases were notified in April 2009 compared to 39 cases notified in the same month of the previous year (Figure 1). For the 12 month period ending 30 April 2009 the national rate was 19.4 per 100 000 population compared to 17.8 for the same 12 month period last year. The cases had varied ages, ranging from less than 1 year to 69 years, with the highest number of cases in the 1-4 years age group (11 cases) followed by 30-39 years age group (10 cases). One case was hospitalised. Among the cases where risk factor information was recorded, 54.5% (6/11) had faecal contact, 45.5% (5/11) had contact with other symptomatic people, 45.5% (5/11) had consumed untreated water, 31.3% (5/16) had contact with farm animals, 28.6% (4/14) had recreational water contact and 21.4% (3/14) had consumed food from a food premise. Three cases had travelled overseas during the incubation period.
  • Invasive pneumococcal disease: 46 cases of invasive pneumococcal disease were notified in April 2009.The highest numbers of cases were reported from Counties Manukau (8), Canterbury (7), Waitemata (5), and Waikato (5) DHBs. Cases had varied ages, ranging from less than 1 year to 70+ years, with the highest number of cases in the 70+ years age group (12 cases). 31 of the cases were hospitalised and one case died from invasive pneumococcal disease (aged 70+ years).
  • Leprosy: Two cases of leprosy were notified in April 2009. One case was laboratory confirmed.This 20-29 year old case is originally from Nepal where a family member has leprosy. The other case, a 40-49 year old who was in the Philippines during their disease incubation period, is still under investigation.
  • Meningococcal disease: Based on the earliest date available1, 7 laboratory-confirmed cases of meningococcal disease were notified during April 2009. In comparison, 4 cases were notified the previous month, March 2009, and 7 cases were notified during the same month last year, April 2008. For the 12 month period ending 30 April 2009, Whanganui DHB recorded the highest incidence rate of 6.3 per 100 000 population (4 cases), followed by Hawke's Bay DHB (5.9 per 100 000, 9 cases) and Southland DHB (5.4 per 100 000, 6 cases). The highest age-specific incidence rate was in infants aged less than one year (32.8 per 100 000 population, 21 cases), followed by those in the 1-4 years age group (14.0 per 100 000, 33 cases), and those in the 15-19 years age group (5.0 per 100 000, 16 cases).

  • Non-seasonal Influenza A (H1N1): Human cases of non-seasonal influenza A (H1N1) initially appeared in Mexico, but have now been confirmed in a number of countries. In New Zealand, influenza A (H1N1) became notifiable on 29 April 2009 and 41 cases were notified in April 2009 (4 confirmed, 11 probable, 24 suspect and 2 under investigation). None of these cases were reported to have been hospitalised or died. For the latest information on the influenza A (H1N1) situation in New Zealand see http://www.moh.govt.nz/influenza-a-h1n1.
  • Mumps: 16 cases of mumps were notified in April 2009 compared to 7 notified cases in the same month of the previous year (Figure 2). The cases were reported from Waikato (3), Waitemata (2), Bay of Plenty (2), Capital and Coast (2), South Canterbury (2), Northland, Auckland, Counties Manukau, Lakes, and Canterbury DHBs (1 case each). Of the two laboratory confirmed cases, one was non-immunised, and the immunisation status of the other case is unknown. Among the 14 non-laboratory confirmed cases, two were recorded as immunised, five as not immunised, and seven cases as immunisation status unknown.
  • Pertussis: 97 cases of pertussis were notified in April 2009, compared to 117 notifications in the preceding month and 19 notifications in same month of the previous year. There were 21 (21.6%) laboratory-confirmed cases. The highest numbers of cases were reported from Canterbury (28), Nelson Marlborough (12) and Waikato (8) DHBs. For the 12 month period ending 30 April 2009, the highest incidence rates were reported from West Coast (74.1 per 100 000 population, 24 cases) and Nelson Marlborough (63.4 per 100 000, 86 cases) DHBs compared to a national rate of 17.9 per 100 000 population. The current 12 month rate by age group was highest amongst infants aged less than one year (110.8 per 100 000 population, 71 cases), followed by children in the 1-4 years age group (29.2 per 100 000, 69 cases).
  • Shigellosis: 10 cases of shigellosis were notified in April 2009 compared to 6 notified cases in the same month of the previous year.The cases were reported from Auckland (2), Counties Manukau (2), Northland, Waitemata, Waikato, Hawke’s Bay, Wairarapa, and Southland DHBs (1 case each). The serotype involved was identified for nine of the cases; Shigella sonnei biotype a (3), S. sonnei biotype g (3), S. flexneri 1 (1), S. flexneri 2a (1) and S. flexneri 4a (1). Cases did not report any overseas travel during the incubation period.
  • Ross River Virus Infection: One case of laboratory-confirmed Ross River virus infection was notified in April 2009. The case was a female in the 1-4 years age group of Maori ethnicity from Waitemata DHB. The case is still under investigation and the overseas travel history is currently unknown.


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 - Apr 2009

Tables:

Monthly National Totals - Apr 2009

Monthly DHB Totals - Apr 2009

Monthly Rolling Totals - Apr 2009

 

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Monthly Notifiable Disease Surveillance Report - Apr 2009

Tables:

Monthly National Totals - Apr 2009

Monthly DHB Totals - Apr 2009

Monthly Rolling Totals - Apr 2009

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