Monthly Notifiable Disease Surveillance Report - Feb 2011
Tuesday 21st March 2023
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Key notifiable disease trends
- Campylobacteriosis: 458 cases of campylobacteriosis were notified in February 2011 compared to 704 cases notified in the same month of the previous year (Figure 1). Four hundred and three (88.0%) cases were laboratory-confirmed. For the 12-month period ending 28 February 2011, the highest rates were reported in Taranaki (210.5 per 100 000 population, 230 cases), South Canterbury (209.5 per 100 000, 117 cases), and Southern (207.4 per 100 000, 629 cases) DHBs compared to a national rate of 155.9 per 100 000.
- Diarrhoeic shellfish poisoning: One case of diarrhoeic shellfish poisoning was notified in February 2011. The case had consumed shellfish collected from Papamoa Beach. This case is still under investigation.
- Giardiasis: 231 cases of giardiasis were notified in February 2011 compared to 186 cases notified in the same month of the previous year. The highest number of cases was reported in Auckland DHB (53 cases), followed by Counties Manukau (34 cases) and Capital and Coast (33 cases) DHBs. Among the cases where risk information was recorded, 52.6% (30/57) had recreational contact with water, 32.8% (19/58) had contact with farm animals, 31.9% (15/47) had consumed untreated water, 30.2% (19/63) had contact with other symptomatic people, 23.8% (15/63) had attended school, and 22.0% (11/50) had consumed food from retail premises during the incubation period. Ten Giardia outbreaks were reported involving 21 cases.
- Hydatid disease: Two cases of hydatid disease were notified in February 2011. One case was a 30-39 year old Asian male from Canterbury DHB and is still under investigation. The second case was confirmed and is a 60-69 year old female from Auckland DHB. This is a chronic case first diagnosed as a child.
- Measles: Twenty cases of measles were notified in February 2011 (16 confirmed, 2 probable, 2 under investigation), compared to 10 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 18 confirmed and probable cases only. Twelve cases were reported in the Auckland region, with the remaining cases from Canterbury (5 cases) and Hutt Valley (1 case) DHBs. Cases were distributed as follows: <1 year (3), 1-4 years (4), 5-9 years (2), 10-14 years (3), 15-19 years (1), 20-29 years (4), and 30-39 years (1). Three hospitalisations were reported. Sixteen cases had immunisation information recorded. Of these, three cases were reported as having been immunised, two cases receiving one dose of the vaccine (both were older than four years, the current age by which two doses are recommended), while for the remaining case the number of dose was not recorded.
- Meningococcal disease: Six cases of meningococcal disease were notified during February 2011, three of which were laboratory-confirmed. In comparison the four cases that were notified in the previous month and all three cases notified during the same month of the previous year were all laboratory-confirmed. For the 12-month period ending 28 February 2011, the highest incidence rates were reported in Hawke’s Bay (5.2 per 100 000 population, 8 cases) and Hutt Valley (4.9 per 100 000, 7 cases) DHBs. The highest age-specific rate was in infants aged less than one year (40.8 per 100 000 population, 26 cases), followed by those in the 1-4 years age group (10.1 per 100 000, 25 cases). One death was reported from Canterbury DHB (<1 year).
- Q fever: One laboratory confirmed case of Q fever was reported in February 2011. The case had been been in Australia, working on a cattle ranch during the incubation period. A number of other farm workers on the ranch also contracted the disease.
- Ross River virus infection: One laboratory confirmed case of Ross River virus was reported in February 2011. The case had been in Australia during the incubation period.
- VTEC/STEC infection: 24 cases of VTEC/STEC infection were notified in February 2011, compared to 21 cases notified in the preceding month and 18 cases in the same month of the previous year. Ten of these cases were laboratory confirmed. Counties Manukau DHB had the highest number of cases (7 cases). The cases were aged from two to 87 years, with the highest number of cases in children aged less than five years (9 cases). Of the 20 cases where information was recorded, nine cases were hospitalised. Escherichia coli O157:H7 was isolated in eight cases. The serotypes for the remaining cases are unknown as yet. Among the cases for which risk factor information was recorded, 100% (4/4) had contact with farm animals, 100% (4/4) had contact with pets, 66.7% (2/3) had contact with manure, 57.1% (4/7) had contact with sick animals, and 42.9% (3/7) had contact with another person with similar symptoms during the incubation period. One outbreak involving three cases of E. coli O157:H7 was reported. The outbreak involved one family and was spread across two households.
- Yersiniosis: 54 yersiniosis cases were notified in February 2011, compared to 38 cases notified in the preceding month and 31 cases the same month of the previous year (Figure 2). Seven cases were hospitalised. Capital and Coast DHB had the highest numbers of cases (12 cases) followed by Waitemata (9 cases) and Auckland and Counties Manukau DHBs (7 cases each). Twenty-one cases occurred in the 1-4 years age group, seven in the 30-39 years age group, and five cases in the 10-14, 20-29 and 70+ years age groups. The biotype involved was identified in 38 (70.4%) of the cases, and the dominant biotypes were Yersinia enterocolitica Biotype 4 (24 cases), Y. enterocolitica Biotype 2 (8 cases), and Y. enterocolitica Biotype 3 (4 cases). Among the cases for which risk factor information was recorded, 53.3% (8/15) consumed food from a food premise, 41.2% (7/17) had contact with recreational water, 29.4% (5/17) had contact with farm animals, and 11.8% (2/17) had contact with faecal material during the incubation period. One household outbreak involving two cases was reported.
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Ph: +64 4 914 0700 Fax: +64 4 914 0770 Email: survqueries@esr.cri.nz |
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