Monthly Surveillance Report - Nov 2006

Friday 20th September 2019


Key Notifiable Disease Trends

  • Leptospirosis: nine cases of leptospirosis were notified in November 2006 compared to two notified cases in the same month of the previous year.  Three cases were notified from Northland, two from Taranaki and one each from MidCentral, Wairarapa, Nelson Marlborough, and Canterbury DHBs. Occupation was recorded for seven cases:  farmers (4 cases), farm worker (1), meat worker (1), and stock truck driver (1). The Leptospira species and serovar was recorded for six of the nine notified cases: L. Borgpetersenii sv hardjo (5 cases) and L. Interrogans sv Pomona (1).
  • Meningococcal disease: based on the earliest date available , 12 cases of meningococcal disease were notified during November 2006, of which 11 (91.7%) were laboratory-confirmed, and none were fatal.  In comparison, 14 cases were notified the previous month, October 2006, and 19 cases were notified during the same month last year, November 2005. For the 12 month period ending 30 November 2006, Waikato DHB recorded the highest incidence rate of 7.9 per 100 000 population (25 cases). The highest age-specific incidence rate was in infants aged less than one year (54.9 per 100 000 population, 30 cases), followed by those in the 1-4 years age group (12.5 per 100 000 population, 27 cases), and those in the 15-19 years age group (10.6 per 100 000 population, 28 cases).
  • Paratyphoid fever: two cases of paratyphoid fever were notified in November 2006 bringing the year to date total to 20 cases. The cases were reported from Auckland and Counties Manukau DHBs. The Auckland case had been overseas (Pakistan) during the incubation period. No source was identified for the Counties Manukau case.  Specifically, they had no overseas travel with the only potential risk factors identified as eating at a food premises and a visit to Waiheke Island. The species were identified as S. Paratyphi B and S. Paratyphi B var Java for the two cases respectively.
  • Pertussis: 68 pertussis cases were notified in November 2006, of whom eight (11.8%) were laboratory-confirmed. The number of pertussis notifications per month has decreased from the peak in November 2004 when 613 cases were notified (Figure 1). Of the 68 cases notified in November 2006, four were reported as being hospitalised. Canterbury DHB had the highest number of cases (16). For the 12 month period ending 30 November 2006, Waikato DHB had the highest incidence rate of 95.4 per 100 000 population (303 cases), compared to the national rate of 33.8 per 100 000 population. Over this period the incidence rate by age group was highest amongst infants aged less than one year (93.3 per 100 000 population). This was followed by those in the 60-69 years age group (43.5 per 100 000) and the 50-59 years age group (42.5 per 100 000 population).
  • Toxic shellfish poisoning: Two cases of toxic shellfish poisoning were notified in November 2006. Both cases were from Waikato DHB and had consumed smoked kahawai.
  • Typhoid fever: nine cases of typhoid fever were notified in November 2006 compared to one notified case in the same month of the previous year (Figure 2). The cases were from Waitemata (4 cases), Waikato (4), and Counties Manukau (1) DHBs. Two cases were hospitalised. The species involved were: Salmonella Typhi phage type E1a (5) and S. Typhi phage type untypable (4). Three of the cases from Waitemata DHB were part of a household outbreak linked to a case who had typhoid fever in Samoa previously. The four cases from Waikato DHB were contacts of a confirmed case and members of the Somali community. A source was not identified for either of the remaining two cases.  The travel history of one of these cases is unknown, but the other case is known not to have travelled overseas during the incubation period.
  • VTEC/STEC infection: eight cases of VTEC/STEC infection were notified in November 2006 bringing the year to date total to 85. This is in comparison to 87 cases notified by the same time last year.  Two cases were from Waitemata, and one each from Northland, Waikato, Lakes, Hawke’s Bay, South Canterbury, and Southland DHBs. Seven of the cases were infected with Escherichia coli O157. Animal contact information was recorded for four cases, three of which had farm animal contact.

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Report:

Monthly Surveillance Report - Nov 2006

Tables:

Monthly National Totals - Nov 2006

Monthly DHB Totals - Nov 2006

Monthly Rolling Totals - Nov 2006

 

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Monthly Surveillance Report - Nov 2006

Tables:

Monthly National Totals - Nov 2006

Monthly DHB Totals - Nov 2006

Monthly Rolling Totals - Nov 2006

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