Monthly Notifiable Disease Surveillance Report - Dec 2011
Tuesday 21st March 2023
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Key notifiable disease trends
- Campylobacteriosis: 975 cases of campylobacteriosis were notified in December 2011 compared to 748 cases notified in the previous month and 675 cases in the same month of the previous year (Figure 1). There were 811 (83.2%) cases that were laboratory-confirmed. For the 12-month period ending 31 December 2011, the highest rates were reported in South Canterbury (225.6 per 100 000 population, 126 cases), Wairarapa (218.5 per 100 000, 88 cases), and Hawke’s Bay (209.3 per 100 000, 325 cases) DHBs compared to a national rate of 153.3 per 100 000.
- Hepatitis C: Five cases of hepatitis C were notified in December 2011 (all under investigation) compared to two cases notified in the same month of the previous year. For the 12-month period ending 31 December 2011 there were 28 cases nationally, compared with 17 cases in the previous year. In the last 12 months the highest rates were reported in South Canterbury (3.6 per 100 000 population, 2 cases), Southern (3.3 per 100 000, 10 cases), Hawke’s Bay (1.3 per 100 000, 2 cases), Canterbury (1.2 per 100 000, 6 cases), and MidCentral (1.2 per 100 000, 2 cases) DHBs compared to a national rate of 0.6 per 100 000.
- Listeriosis: Four cases of listeriosis were notified in December 2011 (3 confirmed, 1 under investigation. There were no perinatal cases. The three laboratory-confirmed cases were from Northland (1), Counties Manukau (1) and Canterbury (1) DHBs and were distributed by age group as follows: 40-49 years (1) and 70+ years (2). All isolates were serotype 4, which is one of the two predominant NZ serotypes. One case died, however listeriosis was not the primary cause of death and there was a history of underlying illness. Risk factors were not reported for the remaining cases.
- Measles: 81 cases of measles were notified in December 2011 (60 confirmed, 15 probable, 6 under investigation), compared to 133 cases notified in the previous month and 1 case in the same month of the previous year. The remainder of this section relates to the 60 confirmed and 15 probable cases only. The highest number of cases was reported in Counties Manukau DHB (36), followed by Auckland (18), and Waitemata (11) DHBs. Cases were distributed by age group as follows: less than 15 months (18), 15 months-3 years (13), 4-9 years (11), 10-19 years (22), 20-29 years (0), 30-39 years (8) and 40+ years (3). There were 11 hospitalisations reported. Of the 63 cases where vaccination status was recorded, 50 cases were not vaccinated, including 18 cases aged less than 15 months. Thirteen cases had been vaccinated against measles with one case reporting having received two doses of vaccine, 11 cases having received one dose (including 7 cases aged less than 4 years), and no dose information was available for the remaining case.
- Pertussis: 540 cases of pertussis were notified in December 2011, compared with 469 cases notified the previous month and 74 cases in the same month of the previous year (Figure 2). There were 76 (14.1%) cases laboratory-confirmed by isolation of Bordetella pertussis from the nasopharynx. A further 105 (19.4%) cases were laboratory-confirmed by PCR. The highest number of cases was reported in Nelson Marlborough DHB (238), followed by Canterbury (70), West Coast (53), Hutt Valley (42) and Capital and Coast (42) DHBs. Cases occurred in all age groups, with the highest numbers in the 5-9 years (87), 1-4 years (71) and 40-49 years (71) age groups. The vaccination status was recorded for 340 (63%) of the cases. Of these, 63 were reported as not vaccinated (including three cases aged less than 6 weeks and therefore not eligible for vaccination), 10 received one dose of vaccine, six received two doses, 163 received three or more doses, and 98 reported as having been vaccinated but no dose information was available. Of the cases where relevant information was recorded, 42.7% (135/316) had contact with a laboratory-confirmed pertussis case and 51.6% (199/386) attended school, pre-school or childcare.
- Rickettsial disease: Two cases of murine typhus were notified in December 2011. There was a laboratory-confirmed case in a male in the 20-29 years age group from Waitemata DHB. Overseas travel to Malaysia during the incubation period was reported. The second case was subsequently made “not a case” in January based on repeat serology.
- Tuberculosis disease: 37 cases of tuberculosis disease were notified in December 2011 (all were new cases), compared to 32 cases notified in the same month of the previous year. The highest number of cases was reported from Auckland (6 cases), Counties Manukau (6 cases) and Waitemata (6 cases) DHBs. Cases ranged in age between less than 1 year to 70+ years, with the highest numbers of cases in the 20-29 years (13 cases) and 30-39 years (7 cases) age groups. Of the 27 (73.0%) cases for which place of birth was recorded, 21 (77.8%) were born outside New Zealand. Eighteen (48.6%) cases were laboratory confirmed of which 15 cases had Mycobacterium tuberculosis isolated.
- Typhoid fever: Six laboratory-confirmed cases of typhoid fever were notified in December 2011. Four cases reported travel during the incubation period, with three cases travelling from India and one from Bangladesh. One case had travelled to Tonga before the incubation period and also had household contact in New Zealand with a notified case. The final case, still under investigation, had contact with visitors from Samoa.
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Ph: +64 4 914 0700 Fax: +64 4 914 0770 Email: survqueries@esr.cri.nz |
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