Monthly Notifiable Disease Surveillance Report - Apr 2010
Tuesday 21st March 2023
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Key notifiable disease trends
- Campylobacteriosis: 510 campylobacteriosis cases were notified in April 2010 compared to 423 cases in the same month of the previous year. Four hundred and forty cases were laboratory-confirmed. For the 12-month period ending 30 April 2010, the highest incidence rates were reported from Hutt Valley (271.2 per 100 000 population, 387 cases) and Taranaki (247.6 per 100 000, 268 cases) DHBs compared to a national rate of 173.5 per 100 000.
- Cryptosporidiosis: 91 cryptosporidiosis cases were notified in April 2010 compared to 51 cases during the same month of the previous year. The highest number of cases was reported in the 1-4 years age group (22 cases). No cases were reported as hospitalised. Canterbury DHB reported the highest number of cases (31 cases), followed by Waitemata (14 cases) and Auckland (14 cases) DHBs. Cryptosporidium parvum oocysts were detected in faecal specimens for 97.8% (89/91) of the cases. Five completed Cryptosporidium outbreaks involving 13 cases were reported in April.
- Giardiasis: 188 giardiasis cases were notified in April 2010 compared to 111 notified in the same month the previous year (Figure 1). Waitemata DHB reported the highest number of cases (31 cases), followed by Auckland (26 cases), Counties Manukau (20 cases) and Waikato (18 cases) DHBs. Among the cases where risk information was recorded, 56.3% (18/32) had faecal contact, 50.0% (19/38) had contact with farm animals, 40.6% (13/32) had recreational contact with water, 38.9% (14/36) had contact with other symptomatic people, and 32.1% (9/28) had consumed untreated water. Nine Giardia outbreaks (eight final and one interim) involving 24 cases were reported in April.
- Hepatitis A: Nine hepatitis A cases were notified in April 2010 compared to two in the same month of the previous year. Ethnicity was reported as Asian (4 cases), Maori (1 case), Pacific Peoples (1 case), European (1 case) and is unknown for the remaining two cases. Five cases (55.6%) reported overseas travel during the incubation period and countries visited included Samoa (2 cases), India, Republic of Korea and Malaysia (each 1 case). Three cases did not report overseas travel during the incubation period. Of these three cases, one was possibly exposed through household contact and the other two cases had no obvious risk factors. The remaining case had unknown travel history and has since been de-notified.
- Legionellosis: Eighteen cases of legionellosis were notified in April 2010 (4 confirmed, 4 probable and 10 under investigation) compared to four in the same month of the previous year. The highest number of cases were from Counties Manukau (5 cases), Auckland (4 cases) and Canterbury (3 cases) DHBs. The cases were distributed by age as follows: 15-19 years (1 case), 20-29 years (2 cases), 30-39 years (1 case), 40-49 years (1 case), 50-59 years (7 cases), 60-69 years (4 cases) and 70+ years (2 cases). Eleven cases were hospitalised. The species involved was identified in eight cases; Legionella pneumophila serogroup 1 (5 cases), L. longbeachae serogroup unknown (2 cases), L. dumoffii (1 case).
- Leptospirosis: Seven cases of leptospirosis (2 confirmed, 1 probable and 4 under investigation) were notified in April 2010 compared to three cases in the same month of the previous year. The cases were from Hawke’s Bay (4 cases), Waikato (2 cases), and Northland (1 case) DHBs. High risk occupation was recorded for five cases, four meat processing workers and one fencer. The remaining two cases were recorded as a technician (with potential overseas animal exposure) and an antiques dealer. The Leptospira serovar was recorded for two cases: L. Australis (1 case) and L. Ballum (1 case).
- Measles: 17 cases of measles (6 confirmed, 2 probable, and 9 under investigation) were notified in April 2010 compared to eight in the same month of the previous year (Figure 2). There were four laboratory confirmed cases. The highest number of cases was reported by Northland DHB (4 cases) followed by Capital and Coast DHB (3 cases). No cases were hospitalised. For more information on the measles situation in New Zealand, including the age, ethnicity, and vaccination status of cases, please refer to the Measles Report available here.
- Meningococcal disease: Based on the earliest date available1, nine cases of meningococcal disease were notified during April 2010, seven of which were laboratory-confirmed. In comparison, 12 cases were notified in the previous month, March 2010, and seven during the same month last year, April 2009. For the 12-month period ending 30 April 2010, Tairawhiti DHB recorded the highest incidence rate of 13.0 per 100 000 population (6 cases), followed by MidCentral (5.4 per 100 000, 9 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 (49.2 per 100 000 population, 31 cases), followed by those in the 1-4 years age group (14.4 per 100 000), 35 cases).
- VTEC/STEC infection: 14 cases of VTEC/STEC infection were notified in April 2010, compared to seven notifications in the same month of the previous year. The highest number of cases was reported from Hawke’s Bay (4 cases), and Canterbury (3 cases) DHBs. The cases were aged between less than 1 year and 70+ years, with the highest number of cases in the 1-4 years age group (7 cases). Escherichia coli O157:H7 was isolated in seven cases, and one case of E. coli O77:HNM. Two cases were hospitalised. Among the cases for which risk factor information was recorded, 75.0% (3/4) had contact with manure, 71.4% (5/7) had contact with animals, 50.0% (4/8) had contact with another person with similar symptoms, and 37.5% (3/8) had contact with children in nappies.
- Ross River virus infection: Three cases of Ross River virus infection were notified in April 2010. All three cases were laboratory-confirmed and had been in Australia during the incubation period.
1The ‘earliest’ date refers to the earliest recorded date for the case (onset or hospitalisation date rather than report date, if available). ‘Earliest’ date, as opposed to ‘report date’ alone, is used throughout the analysis of meningococcal disease notification data.
Note: Click on the document links below to open. These documents are in PDF format. You will need to download the free Adobe Acrobat Reader to view them.
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Ph: +64 4 914 0700 Fax: +64 4 914 0770 Email: survqueries@esr.cri.nz |
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