Monthly Notifiable Disease Surveillance Report - Nov 2011

Monday 23rd September 2019


Key notifiable disease trends

  • Cryptosporidiosis: 87 cases of cryptosporidiosis were notified in November 2011, compared to 76 cases notified in the same month of the previous year. For the 12-month period ending 30 November 2011 the national rate was 14.4 per 100 000 population compared to 22.1 for the same 12-month period last year. Cases were distributed throughout New Zealand, with the highest number of cases reported in Southern DHB (19). The highest numbers of cases reported occurred in the 1-4 years (27) and 30-39 years (16) age groups. One hospitalisation was reported. Among the cases where risk factor information was recorded, 68.3% (28/41) had contact with farm animals, 48.7% (19/39) had consumed untreated water, and 39.1% (18/46) had attended school, preschool or childcare.
  • Hydatid disease: One case of hydatid disease was notified in November 2011. This case has since been made “not a case” after further investigation.
  • Hepatitis A: Five cases of hepatitis A were notified in November 2011 (3 confirmed, 1 probable, 1 under investigation), compared with one case notified in the same month of the previous year.  Ethnicity was reported as Asian (2), Māori (1), European (1), and is unknown for the remaining case.  Of the three confirmed cases, two reported overseas travel history during the incubation period. The remaining confirmed case reported household contact with a confirmed case in previous two months.
  • Leptospirosis: 11 cases of leptospirosis (4 confirmed, 2 probable, and 5 under investigation) were notified in November 2011 compared to five cases in the same month of the previous year.  The cases were from Canterbury (4), Northland (2), Hawke’s Bay (2), Capital and Coast, West Coast and Southern (1 each) DHBs. High risk occupations were recorded for seven cases: farmer (5), earthmoving labourer (1), and freezing worker (1). Of the four remaining cases, one reported exposure to pet pigs, one was overseas during the incubation period, and risk factor information was unknown for two cases. The Leptospira serovar was identified for five cases: L. Pomona (2), L. Ballum, L. Hardjo, and L. Tarassovi (1 each).
  • Measles: 140 cases of measles were notified in November 2011 (120 confirmed, 10 probable, 10 under investigation), compared to 100 cases notified in the previous month and no cases in the same month of the previous year. The remainder of this section relates to the 120 confirmed and 10 probable cases only. The highest number of cases was reported in Auckland DHB (52), followed by Waitemata (31), Southern (16) and Counties Manukau (12) DHBs. Cases were distributed by age group as follows: less than 15 months (18), 15 months-3 years (12), 4-9 years (17), 10-19 years (34), 20-29 years (21), 30-39 years (20) and 40+ years (8). There were 17 hospitalisations reported. Of the 90 cases where vaccination status was recorded, 64 cases were not vaccinated, including 17 cases aged less than 15 months and therefore not eligible for vaccination. Twenty-six cases had been vaccinated against measles with eight cases reporting having received two doses of vaccine, 17 cases having received one dose (including 6 cases aged less than 4 years so only eligible for one dose), and no dose information was available for the remaining case.
  • Pertussis: 494 cases of pertussis were notified in November 2011, compared with 237 cases notified the previous month and 67 cases in the same month of the previous year. There were 108 (21.9%) cases laboratory-confirmed by isolation of Bordetella pertussis from the nasopharynx. A further 82 (16.6%) cases were laboratory-confirmed by PCR. The highest number of cases was reported in Nelson Marlborough DHB (111), followed by Canterbury (90), Hutt Valley (76) and Capital and Coast (73) DHBs. Cases occurred in all age groups, with the highest numbers in the 5-9 years (97), 1-4 years (75) and 10-14 years (68) age groups. The vaccination status was recorded for 335 (67.8%) of the cases. Of these, 85 were reported as not vaccinated (including six cases aged less than 6 weeks and therefore not eligible for vaccination), 17 received one dose of vaccine, six received two doses, 175 received three or more doses, and 52 reported as having been vaccinated but no dose information was available. Of the cases where relevant information was recorded, 55.5% (121/218) had contact with a laboratory-confirmed pertussis case and 60.3% (216/358) attended school, pre-school or childcare.
  • Rickettsial disease: One laboratory-confirmed case of murine typhus was notified in November 2011. The case was a female in the 50-59 years age group from Waitemata DHB. Overseas travel to Canada during the incubation period was reported.
  • Shigellosis: 11 cases of shigellosis were notified in November 2011 compared with eight cases notified in the previous month and one case in the same month of the previous year (Figure 1). Cases occurred in the following DHBs: Auckland (5), Waitemata, Counties Manukau, Bay of Plenty, Tairawhiti, Whanganui and Canterbury (1 each). The serotype involved was identified for 10 cases: Shigella sonnei biotype g (3), S. flexneri 1, S. flexneri 2a, S. flexneri 3a, S. flexneri 4a, S. flexneri 6 biotype Boyd 88, S. flexneri x variant, and S. sonnei biotype a (1 each). Overseas travel during the incubation period was recorded for seven cases. Countries visited or lived in were India (4 cases), Fiji, Morocco and Vietnam (1 case each).
  • Yersiniosis: 63 cases of yersiniosis were notified in November 2011, compared to 31 cases notified in the previous month and 49 cases in the same month of the previous year (Figure 2). Canterbury DHB had the highest numbers of cases recorded (11 cases), followed by Capital and Coast (9) and Auckland (8) DHBs. Cases occurred in all age groups, with the highest numbers reported in the 1-4 years (15) and 50-59 years (14) age groups. Two cases were hospitalised. The biotype involved was identified in 53 (84.1%) of the cases, and the dominant biotypes were Yersinia enterocolitica biotype 4 (18), Y. enterocolitica biotype 2 (17), and Y. enterocolitica biotype 1A (12).  Among the cases for which risk factor information was recorded, 53.3% (8/15) consumed untreated water, 50.0% (9/18) had contact with farm animals, 35.3% (6/17) consumed food from a food premise, 22.2% (4/18) had contact with faecal material, and 21.1% (4/19) had contact with recreational water during the incubation period. 

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Report:

Monthly Notifiable Disease Surveillance Report - Nov 2011

Tables:

Monthly National Totals - Nov 2011

Monthly DHB Totals - Nov 2011

Monthly Rolling Totals - Nov 2011

 

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Monthly Notifiable Disease Surveillance Report - Nov 2011

Tables:

Monthly National Totals - Nov 2011

Monthly DHB Totals - Nov 2011

Monthly Rolling Totals - Nov 2011

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