Monthly Notifiable Disease Surveillance Report - Sep 2016

Thursday 19th September 2019


Key notifiable disease trends

Brucellosis: One case of brucellosis (under investigation) was notified in September 2016. The case was a female from Northland DHB, who reported overseas travel to Fiji, Kazahkstan and Mongolia during the incubation period for the disease. Occupational exposure to calves in the three months prior to illness was also recorded.

Campylobacteriosis: 571 cases of campylobacteriosis (554 confirmed, 8 probable and 9 under investigation) were notified in September 2016 compared to 570 cases notified during the same month of the previous year (Figure 1). For the 12 month period ending 30 September 2016, the highest rates were in Hawke’s Bay (573.2 cases per 100,000 population, 58 cases), South Canterbury (244.0 per 100,000 population, 16 cases) and West Coast (192.7 per 100,000 population, 8 cases) DHBs, compared to a national rate of 148.4 per 100,000 population. Forty-five people were hospitalised. Cases ranged in age from 1 month to 94 years, and the highest number of cases was reported in the 20–29 years age group (106 cases). One interim outbreak was created in September (case numbers yet to be determined).

Chikungunya fever: Five cases of chikungunya fever (4 confirmed and 1 under investigation) were notified in September 2016. Twenty-three cases have been notified in the year to date compared to 47 at the same time in the previous year. Cases were in the 20–29 years (3 cases), 40–49 years and 70 years and over (1 case each) age groups. All cases reported overseas travel during the incubation period for the disease, and countries visited were India (3 cases), Fiji and Tonga (1 case each).

Cryptosporidiosis: 213 cases of cryptosporidiosis (208 confirmed, 2 probable and 3 under investigation) were notified in September 2016 compared to 175 cases notified during the same month of the previous year. The 12-month rate in September (21.3 cases per 100,000 population) was higher than at the same time in the previous year (14.6 per 100,000). The highest 12-month rates were in Northland (58.2 per 100,000, 34 cases) and Wairarapa (39.4 per 100,000, 6 cases) DHBs. Cases ranged in age from 5 months to 74 years, with the highest numbers of cases in the 1–4 years (71 cases), 20–29 years (36 cases) and 5–9 years (30 cases) age groups. Among the cases for which risk factor information was recorded, 67.1% (102/152) had contact with farm animals, 49.6% (64/129) had consumed untreated water, and 37.8% (51/135) had attended school, preschool or childcare during the incubation period for the disease. Six finalised Cryptosporidium outbreaks (25 cases total) and one interim outbreak (case numbers yet to be determined) were created in September.

Hepatitis A: Three confirmed cases of hepatitis A were notified in September 2016 compared to one case notified during the previous month and zero cases notified during the same month of the previous year. Cases were reported in the European or Other (2 cases) and Unknown (1 case) ethnic groups, and were reported from West Coast, Hutt Valley and Southern DHBs, respectively. The cases were in the 40–49 years (2 cases) and 60–69 years (1 case) age groups. One case reported overseas travel to Cambodia during the incubation period for the disease. One case reported consumption of frozen berries as the probable source. One case reported no known risk factors for the disease.

Legionellosis: 23 cases of legionellosis (14 confirmed, 2 probable and 7 under investigation) were notified in September 2016 compared to 14 cases notified during the previous month, and 16 during the same month of the previous year. The highest number of cases was reported from Northland DHB (5 cases). The Legionella species was identified for 9 cases as: L. longbeachae (5 cases), L. pneumophila (3 cases) and L. micdadei (1 case). The increase in legionellosis notifications for the year (cumulative total 189 in September 2016 compared with 126 cases in September 2015) may be due to the LegiNZ study, which began in May 2015 and involves 20 hospitals in 17 DHBs.
 
Meningococcal disease: Seven confirmed cases of meningococcal disease were notified in September 2016 compared to 11 cases notified during the same month of the previous year (Figure 2). Cases were reported from Auckland and Southern (2 cases each), Northland, Counties Manukau and Waikato (1 case each) DHBs. Cases were reported in the 15–19 years and 60–69 years (2 cases each), 1–4 years, 5–9 years and 40–49 years (1 case each) age groups. All cases were hospitalised and no deaths were reported. All cases were laboratory confirmed and the group was determined for six cases: group B (5 cases, including 1 NZ B:P1.7-2,4) and  group W (1 case). One interim Neisseria meningitidis outbreak was created in September (case numbers yet to be determined).

Rheumatic fever: 16 cases of rheumatic fever - initial attack (5 confirmed, 5 probable, 2 suspect and 4 under investigation) were notified in September 2016 compared to four cases (3 initial attack and 1 recurrent attack) in the same month of the previous year. All cases were from the North Island: Counties Manukau (6 cases), Auckland, Waikato, Hawke’s Bay (2 cases each), Waitemata, Bay of Plenty, Hutt Valley and Capital & Coast (1 case each) DHBs. Cases ranged in age from 7 to 33 years, with the highest number of cases in the 10–14 years age group (9 cases). Cases were reported in the Pacific peoples (12 cases) and Māori (4 cases) ethnic groups. Fifteen cases were hospitalised. Numbers are based on report date which may not be a good indicator of newly incident cases as a high proportion of notifications have reporting delays.

Shigellosis: 17 confirmed cases of shigellosis were notified in September compared with ten cases notified during the same month of the previous year. The 12-month rate in September (3.1 cases per 100,000 population) was slightly higher than at the same time in the previous year (2.4 per 100,000). The highest number of cases was reported from Auckland DHB (5 cases). The serotype involved was recorded for 94.1% (16/17) of cases: S. sonnei biotype g (7 cases), S. sonnei biotype a (5 cases), S. dysenteriae 9, S. flexneri 1b, S. flexneri 6 and S. flexneri 6 biotype Manchester (1 case each). Information on overseas travel during the incubation period was recorded for all cases, of which 52.9% (9/17) of cases recorded overseas travel. Countries visited included: India and Indonesia (2 cases each), Australia, Fiji, Papua New Guinea, Samoa and South America nfd (1 case each). One case reported overseas travel to two countries.

Yersiniosis: 84 cases of yersiniosis (80 confirmed and 4 under investigation) were notified in September 2016 compared to 63 cases notified in the same month of the previous year. After further investigation, 3 cases have since been found not to meet the case criteria. The highest numbers of cases were reported from Canterbury (17 cases), Waitemata (14 cases) and Capital & Coast (10 cases) DHBs. Cases ranged in age from 8 months to 79 years, with the highest numbers of cases in the 1–4 years (16 cases) and 40–49 years (11 cases) age groups. Ten cases were hospitalised. The Yersinia species involved was identified by ESR for 84.0% (68/81) cases; Y. enterocolitica (59 cases) and Y. pseudotuberculosis (9 cases). The most common Y. enterocolitica biotypes reported were biotype 2 (24 cases) and 1A (15 cases). Among the cases for which risk factor information was recorded, 50.0% (18/36) had consumed food from a food premises, 23.5% (8/34) had contact with other symptomatic people, and 21.6% (8/37) had attended school, preschool or childcare during the incubation period for the disease.

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Report:

Monthly Notifiable Disease Surveillance Report - September 2016

Tables:

Monthly National Totals - September 2016

Monthly DHB Totals - September 2016

Monthly Rolling Totals - September 2016

 

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Monthly Notifiable Disease Surveillance Report - September 2016

Tables:

Monthly National Totals - September 2016

Monthly DHB Totals - September 2016

Monthly Rolling Totals - September 2016

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