Monthly Notifiable Disease Surveillance Report - Nov 2016

Saturday 21st September 2019


Key notifiable disease trends

Campylobacteriosis: 1103 cases of campylobacteriosis (835 confirmed, 263 probable and 5 under investigation) were notified in November 2016 compared to 779 cases notified during the same month of the previous year (Figure 1). For the 12 month period ending 30 November 2016, the highest rates were reported in Hawke’s Bay (827.4 cases per 100,000 population, 296 cases), South Canterbury (261.1 per 100,000, 18 cases) and Taranaki (196.7 per 100,000, 28 cases) DHBs, compared to a national rate of 161.4 per 100,000. Seventy-three people were hospitalised. Cases ranged in age from 3 months to 97 years, and the highest number of cases was reported in the 70 years and over age group (167 cases). One finalised Campylobacter outbreak was created in November (2 cases).

Chikungunya fever: Two cases of chikungunya fever (1 confirmed and 1 probable) were notified in November. Twenty-seven cases have been notified in the year to date compared to 48 at the same time in the previous year. Cases were in the 30–39 years and 70 years and over age groups and were from Auckland and Counties Manukau DHBs, respectively. Both cases reported overseas travel to India during the incubation period for the disease.

Cryptosporidiosis: 95 cases of cryptosporidiosis (94 confirmed and 1 probable) were notified in November 2016 compared to 66 cases notified during the same month of the previous year. The 12-month rate in November (22.8 cases per 100,000 population) was higher than at the same time in the previous year (15.0 per 100,000). The highest 12-month rates were reported in Northland (64.2 per 100,000, 8 cases) and Wairarapa (46.3 per 100,000, 1 case) DHBs. Cases ranged in age from 10 months to 94 years, with the highest numbers of cases in the 1–4 years (26 cases) and 30–39 years (20 cases) age groups. Among the cases for which risk factor information was recorded, 50.0% (24/48) had attended school, preschool or childcare, 46.9% (23/49) had contact with farm animals, and 33.3% (17/51) had contact with other symptomatic people during the incubation period for the disease. Five finalised Cryptosporidium outbreaks (46 cases total) and one interim outbreak (case numbers yet to be determined) were created in November.

Hepatitis NOS: One confirmed case of hepatitis NOS (hepatitis E) was notified in November 2016. The case was a male in the 20–29 years age group from Auckland DHB. The case reported overseas travel to India during the incubation period for the disease.

Leptospirosis: Fifteen cases of leptospirosis (11 confirmed and 4 under investigation) were notified in November compared to seven cases notified during the same month of the previous year. The highest number of cases was reported from Hawke’s Bay and Southern DHBs (4 cases each). Cases were reported in the 50–59 years (7 cases), 40–49 years (4 cases), 20–29 years and 60–69 years (2 cases each) age groups. Occupational exposure risk factor information was recorded for all cases, ten were farmers or farm workers and two worked in the meat processing industry. Of the cases that did not have a high risk occupation, one had exposure to streams, rivers, lakes, and another had exposure to farm or wild animals in the 20 days before illness. One case had no other risk factor information recorded. The Leptospira species was recorded for five cases; LBallum, L. Canicola and L. Hardjo, L. Hardjo, L. Tarrasovi and L. Pomona (1 case each).

Meningococcal disease: 12 confirmed cases of meningococcal disease were notified in November 2016 compared to four cases notified during the same month of the previous year. Cases were reported from Waitemata (3 cases), Canterbury and Bay of Plenty (2 cases each), Waikato, Wairarapa, Capital & Coast, Nelson Marlborough and Southern (1 case each) DHBs. Cases were reported in the 1–4 years (4 cases), 20–29 years (3 cases), less than 1 year (2 cases), 15–19 years, 40–49 years and 60–69 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 11 cases: group B (7 cases, including 3 NZ B:P1.7-2,4), group W and group C (2 cases each). One finalised Neisseria meningitidis outbreak was created in November (2 cases).

Ross River virus infection: One case of Ross River virus infection was notified in November 2016. After further investigation, the case has since been found not to meet the case criteria.

Shigellosis: 18 cases of shigellosis (16 confirmed, 1 probable and 1 under investigation) were notified in November compared with eight cases notified during the same month of the previous year. The 12-month rate in November (3.4 cases per 100,000 population) was slightly higher than at the same time in the previous year (2.5 per 100,000). The highest number of cases was reported from Waitemata DHB (6 cases). The serotype involved was recorded for 94.4% (17/18) of cases: S. flexneri 1b and 2a (5 cases each), S. flexneri 6 biotype Boyd 88 (4 cases), S. sonnei biotype a, S. sonnei biotype g and S. flexneri (1 case each). Information on overseas travel during the incubation period was recorded for 83.3% (15/18) of cases, of which 93.3% (14/15) of cases recorded overseas travel during the incubation period for the disease. Countries visited included: Samoa (6 cases), India (5 cases), Australia and Tonga (2 cases each), Indonesia, Malaysia and Nepal (1 case each). Some cases reported overseas travel to more than one country. One case who did not travel during the incubation period for the disease reported household contact with a symptomatic person, a visitor from Samoa.

Tetanus: One confirmed case of tetanus was notified in November 2016. The case was a female in the 60–69 years age group from Waikato DHB.

VTEC/STEC infection: 37 cases of VTEC/STEC infection (34 confirmed and 3 under investigation) were notified in November compared to 27 cases confirmed during the same month of the previous year (Figure 2). After further investigation, three cases have since been found not to meet the case criteria. The 12-month rate in November (9.7 cases per 100,000 population) was notably higher than at the same time in the previous year (6.7 per 100,000). The highest number of cases was reported from Southern DHB (8 cases) followed by Waitemata (5 cases) and Counties Manukau (4 cases) DHBs. Cases ranged in age from 5 months to 89 years, with the highest number of cases in the 1–4 years age group (7 cases). Six cases were hospitalised. Thirty-three cases have been confirmed by the Enteric Reference Laboratory as being infected with VTEC/STEC, and of these the serotype was identified as Escherichia coli O157:H7 (8 cases) and non-O157 (16 cases). Nine cases have verocytotoxin detected but a serotype has not yet been identified. Of the cases for which risk factor information was recorded, 60.0% (15/25) had contact with animals, 19.0% (4/21) had contact with children in nappies, 15.4% (4/26) had recreational contact with water, and 14.8% (4/27) were overseas during the incubation period for the disease. The increase in notifications for DHBs in the Auckland region may be due to a change in laboratory methods in July 2015; all faecal specimens are now screened for VTEC/STEC using PCR. Two finalised VTEC/STEC outbreaks (4 cases total) and one interim outbreak (case numbers yet to be determined) were created in November.

Yersiniosis: 116 cases of yersiniosis (110 confirmed and 6 under investigation) were notified in November 2016 compared to the same number of cases notified in the same month of the previous year. After further investigation, three cases have since been found not to meet the case criteria. The 12-month rate in November (18.1 per 100,000 population) was higher than at the same time in the previous year (13.7 per 100,000). The highest numbers of cases were reported from Canterbury (28 cases) and Bay of Plenty (23 cases) DHBs. Cases ranged in age from 5 months to 90 years, with the highest number of cases in the 20–29 years age group (20 cases). Six cases were hospitalised. The Yersinia species involved was identified by ESR for 91.2% (103/113) cases; Y. enterocolitica (99 cases) and Y. pseudotuberculosis (4 cases). The most common Y. enterocolitica biotypes reported were biotype 2 (59 cases) and 1A (22 cases). Among the cases for which risk factor information was recorded, 59.3% (32/54) had consumed food from a food premises, 25.0% (14/56) had recreational contact with water, 16.7% (9/54) had contact with faecal matter or vomit, and 16.4% (10/61) attended school, preschool or childcare during the incubation period for the disease. One interim Yersinia outbreak was created in November (case numbers yet to be determined).

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Report:

Monthly Notifiable Disease Surveillance Report - November 2016

Tables:

Monthly National Totals - November 2016

Monthly DHB Totals - November 2016

Monthly Rolling Totals - November 2016

 

DOWNLOADS

Monthly Notifiable Disease Surveillance Report - November 2016

Tables:

Monthly National Totals - November 2016

Monthly DHB Totals - November 2016

Monthly Rolling Totals - November 2016

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