Monthly Notifiable Disease Surveillance Report - Sep 2011

Wednesday 18th September 2019


Key notifiable disease trends

  • Gastroenteritis: 71 cases of gastroenteritis were notified in September 2011, compared to 46 cases notified in the same month of the previous year. A causal agent was confirmed for 23 (32.4%) cases and the pathogens reported were rotavirus (20), norovirus (2 cases), and Aeromonas spp. (1 case). The highest number of cases was reported in Capital and Coast (16 cases) and  Bay of Plenty (13 cases) DHBs. Cases ranged in age between less than 1 year and 70+ years, with the highest number of cases in the 1-4 years (22 cases) and 40-49 years (10 cases) age groups. Of the 71 cases reported, 18 were associated with 4 different outbreaks.
  • Hepatitis C: Six cases of hepatitis C were notified in September 2011 (four confirmed, two under investigation), compared to one in the same month of the previous year.  Ethnicity was reported as European (3 cases), Māori (2 cases), and was unknown for the remaining case.  Of the four confirmed cases, three reported a history of injecting drug use, risk factors were unknown or not reported for the remaining case. None of the four confirmed cases were overseas during the incubation period.
  • Hydatid disease: One laboratory confirmed case of hydatid disease was notified in September 2011. The case was a female of European ethnicity in the 70+ years age group, from Hawke’s Bay DHB. The cysts were discovered incidentally and investigation of the case indicated that this is most likely a historical infection.
  • Legionellosis: 43 cases of legionellosis were notified in September 2011 (9 confirmed, 1 probable and 33 under investigation), compared to 13 cases notified in the same month of the previous year. It is likely that, following reference laboratory testing, many of the under investigation cases will not meet the case definition. The following section relates to the 10 confirmed and probable cases only. The highest number of cases was reported in Canterbury DHB (6 cases). Cases were distributed by age group as follows: 60-69 years (3), 70+ years (3), 30-39 years (2), 20-29 years (1), and 40-49 years (1). Five hospitalisations were reported. Among the cases where risk information was recorded, six reported exposure to environmental sources of infection, five cases reported exposure to compost/potting mix,  and one reported staying at an overseas resort where there were other cases. The Legionella species was identified in six cases: Legionella longbeachae serogroup 1 or 2 (2 cases), L. dumoffii (2 cases), L. pneumophila serogroup 12 and L. sainthelensi  (1 case each). 
  • Measles: 90 cases of measles were notified in September 2011 (83 confirmed, 1 probable and 6 under investigation), compared to 40 cases notified in the previous month and two cases in the same month of the previous year. The remainder of this section relates to the 83 confirmed cases only. The cases were reported in Auckland (58), Waitemata (17), Counties Manukau (4) Northland, Waikato, Capital, and Coast and Canterbury (1 case each) DHBs. Cases age groups were distributed as follows: less than 1 year (6), 1-4 years (22), 5-9 years (4), 10-14 years and 15-19 years (5 cases each), 20-29 years (16), 30-39 years (20), 40-49 years (4), and 60-69 years (1). Twenty-three hospitalisations were reported in the 1-4 years (1), 10-14 years (1), 15-19 years (3), 20-29 years (8), and 30-39 years (10) age groups. Of the 56 cases for whom immunisation information was available, 30 (53.6%) had not been immunised, including 14 cases aged less than 15 months and not eligible. Of the 26 immunised cases, 18 had received one dose of vaccine (including nine cases aged less than 4 years and therefore only eligible for one dose of vaccine), four cases had received two doses of vaccine. Dose information was not recorded for four cases.
  • Meningococcal disease: 19 cases of invasive meningococcal disease were notified during September 2011 (18 were laboratory confirmed), compared to 23 cases notified in the previous month and five during the same month last year (Figure 1). Cases were distributed by DHB as follows: Counties Manukau (4), Capital and Coast, Hutt Valley and Northland (3 cases each), Auckland (2), Waitemata, Waikato, West Coast and Canterbury (1 case each). The highest numbers of cases were in the 1-4 years (6), 15-19 years (5), and less than 1 year (4) age groups.  The cases were of European (8), Pacific Peoples (6), and Māori (5) ethnicities. Of the 18 laboratory confirmed cases the strain type was determined for 16 cases: epidemic strain (6), C (6), and B other (i.e. non-epidemic strain) (4). There were two deaths reported.
  • Paralytic shellfish poisoning: One suspect case of paralytic shellfish poisoning was notified from  Bay of Plenty DHB in September 2011. The case had consumed seafood fritters made from tuatua harvested recreationally in the region.
  • Pertussis: 225 cases of pertussis were notified in September 2011, compared to 118 cases notified in the previous month and 66 cases in September the previous year. There were 88 (39.1%) laboratory confirmed cases. The majority of the cases were reported in West Coast (59), Nelson Marlborough (45), Canterbury (28), Hawke's Bay (26), Capital and Coast (12), and Southern (11) DHBs. The highest numbers of cases were in the 5-9 years (54), 1-4 years (44), 40-49 years (22), and 30-39 years (21) age groups. The immunisation status was recorded for 158 (70.2%) of the cases, with 114 cases reported as having been immunised. Of those 114 cases, dose information was recorded for 23 (20.2%) cases: 17 cases received five doses, two cases each received three doses, two doses and one dose.  Of the cases where the relevant information was recorded, 55.7% (93/167) attended school, pre-school or childcare, and 47.3% (52/110) had contact with a laboratory confirmed pertussis case.
  • Rickettsial disease: Three cases of rickettsial disease were notified in September 2011. However, on further investigation, these cases were found not to meet the case definition.
  • Yersiniosis: 49 yersiniosis cases were notified in September 2011, compared to 87 cases notified in the preceding month and 37 in September 2010 (Figure 2). The highest numbers of cases were reported in Waikato (11), Auckland (8), Waitemata (6), Counties Manukau (5), and Hutt Valley (4) DHBs. The cases were aged from 10 months to 80 years with the highest number of cases in the 1-4 years (13), 40-49 years (8), 50-59 years and 60-69 years (5 cases each) age groups. Two cases were hospitalised. Biotyping results were available for 39 (79.6%) of cases. The most commonly identified biotypes were: Yersinia enterocolitica Biotype 2 (14 cases), Y. enterocolitica Biotype 4 (14 cases) and Y. enterocolitica Biotype 1A (6 cases).  Among the cases for which risk factor information was recorded, 37.5% (6/16) had contact with farm animals, 11.8% (2/17) had consumed untreated water during the incubation period, 12.5% (2/16) had contact with faecal matter, and 8.3% (1/12) had contact with a sick animal.

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Report:

Monthly Notifiable Disease Surveillance Report - Sep 2011

Tables:

Monthly National Totals - Sep 2011

Monthly DHB Totals - Sep 2011

Monthly Rolling Totals - Sep 2011

 

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Monthly Notifiable Disease Surveillance Report - Sep 2011

Tables:

Monthly National Totals - Sep 2011

Monthly DHB Totals - Sep 2011

Monthly Rolling Totals - Sep 2011

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