Monthly Notifiable Disease Surveillance Report - Sep 2017

Thursday 19th September 2019


Key notifiable disease trends

Campylobacteriosis: 592 cases of campylobacteriosis (584 confirmed and 8 under investigation) were notified in September 2017 compared to 572 cases notified in in September 2016. The 12-month rate for the period ending 30 September (151.7 cases per 100,000 population) was slightly higher than for the same period in the previous year (145.3 per 100,000). The highest rates were reported in Hawke’s Bay (421.9 cases per 100,000 population, 18 cases), South Canterbury 241.6 per 100,000, 15 cases) and Southern (222.0 per 100,000, 68 cases) DHBs. Cases ranged in age from 3 days to 99 years, and the highest numbers of cases were reported in the 20–29 years (119 cases), 50–59 years (80 cases) and 30–39 years (78 cases) age groups.

Cryptosporidiosis: 244 cases of cryptosporidiosis (241 confirmed and 3 under investigation) were notified in September 2017 compared to 213 cases notified in September 2016. The 12-month rate for the period ending 30 September (24.4 cases per 100,000 population) was slightly higher than for the same period in the previous year (20.8 per 100,000). Cases ranged in age from 7 days to 72 years, with the highest numbers of cases in the 1–4 years (77 cases) and 20–29 years (49 cases) age groups. Among the cases for which risk factor information was recorded, 38.9% (63/162) had attended school, preschool or childcare, 25.7% (38/148) had contact with faecal matter or vomit, 17.0% (25/147) had consumed food from a food premises, 16.7% (24/144) had contact with other symptomatic people, and 11.5% (18/157) had recreational contact with water during the incubation period for the disease. Two finalised Cryptosporidium outbreaks (7 cases) were created in September.

Leptospirosis: 16 cases of leptospirosis (5 confirmed and 11 under investigation) were notified in September 2017 compared to seven cases notified in September 2016. After further investigation one case was found not to meet the case criteria. The highest number of cases was reported in the 30–39 years (4 cases) age group. Occupation was recorded for 80.0% (12/15) of cases. Of these, nine were engaged in occupation previously identified as high risk exposure to Leptospira species: farmers or farm workers (7 cases) and meat workers (2 cases). Three additional cases reported exposure through contact with animals: rats (2 cases) and pigs (1 case). The remaining three cases did not have any risk factor information recorded. The Leptospira serovar was recorded for five cases: L. Pomona, L. Hardjo (2 cases each), and L. Tarassovi (1 case).
Leprosy: One confirmed leprosy case was notified in September 2017. The case was in the 20–29 years age group. The case travelled to the Kiribati during the incubation period.

Mumps: 251 cases of mumps (162 confirmed, 50 probable and 39 under investigation) were notified in September 2017 compared with three cases notified in September 2016 (Figure 1). The 12-month rate for the period ending 30 September was 14.4 cases per 100,000 population. After further investigation nine cases were found not to meet the case criteria. The highest numbers of cases were reported from Counties Manukau (86 cases), Auckland (71 cases), and Waitemata (51 cases) DHBs. The highest numbers of cases were in the 20–29 years (85 cases) and 15–19 years (80 cases) age groups. Eighty cases were recorded as being vaccinated against mumps, of which 56 cases had received two doses of the vaccine and 22 cases had received just one dose. Two further cases had been vaccinated, but no dose information was available. Vaccination status was unknown for 107 cases and 55 cases were recorded as non-vaccinated. One interim mumps virus outbreak (case numbers yet to be determined) was created in September.

Paratyphoid fever: 20 cases (17 confirmed, 1 probable and 2 under investigation) of paratyphoid fever were notified in September 2017 compared to one case notified in the same month of the previous year in September 2016 (Figure 2). The highest number of cases was reported from Hawke’s Bay (12 cases) DHB. Cases ranged in age from 1 to 60 years, with the highest numbers of cases in the 20–29 years (8 cases) and 15–19 years (4 cases) age groups. Eleven cases were hospitalised. The Salmonella Paratyphi serotypes involved were identified by the Enteric Reference Laboratory for 85.0% (17/20) of cases: S. Paratyphi A (10 cases) and S. Paratyphi B var. Java (7 cases). Among the cases for which risk factor information was recorded, 33.3% (5/15) had recreational contact with water, 30.8% (4/13) had had contact with faecal matter or vomit, 28.6% (4/14) had contact with other symptomatic people, and 14.3% (2/14) attended school, pre-school, or childcare during the incubation period for the disease. One interim S. Paratyphi A outbreak (case numbers yet to be determined) was created in September.

Pertussis: 191 cases of pertussis (107 confirmed, 59 probable, 8 suspected, and 17 under investigation) were notified in September 2017 compared to 111 cases in September 2016. After further investigation one case was found not to meet the case criteria. The 12-month rate for the period ending 30 September (29.7 cases per 100,000) was higher than fort the same period in the previous year (22.5 per 100,000). Eleven cases were hospitalised and no deaths were reported. Fifty percent (95/190) of cases were laboratory-confirmed (4 by culture, 74 by PCR, and 17 by culture and PCR). The highest number of cases was reported from Canterbury DHB (28 cases), followed by Waitemata (25 cases), Waikato and Southern (20 cases each) DHBs. Cases ranged in age from 18 days to 76 years, with 16.3% (31/190) under five years of age (including 17 cases aged less than 1 year). The highest numbers of cases were in the 5–9 years (31 cases), 40–49 years (30 cases) and 10–14 years (25 cases) age groups. One finalised Bordetella pertussis outbreak (4 cases) and two interim outbreaks (case numbers yet to be determined) were created in September.

Taeniasis: One case of taeniasis (under investigation) was notified in September 2017. The case was in the 50–59 years age group and had travelled to Laos during the incubation period for the disease.

Yersiniosis: 103 confirmed cases of yersiniosis were notified in September 2017 compared to 81 cases notified in September 2016. The 12-month rate for the period ending 30 September (20.8 per 100,000 population) was higher than for the same period in the previous year (16.9 per 100,000). The highest numbers of cases w reported from Canterbury (21 cases) and Waitemata (14 cases). Cases ranged in age from 8 months to 93 years, with the highest numbers of cases in the 60–69 years (16 cases) and 20–29 years (15 cases) age groups. Seven cases were hospitalised. The Yersinia species involved were identified by the Enteric Reference Laboratory for 89.3% (92/103) of cases. The cases were identified as Y. enterocolitica (88 cases) and Y. pseudotuberculosis (4 cases). The Y. enterocolitica biotypes reported were biotype 2 (45 cases), biotype 1A (30 cases), biotype 3 (7 cases) and biotype 4 (6 cases). Among the cases for which risk factor information was recorded, 50.0% (22/44) had consumed food from a food premises, 20.5% (9/44) had contact with faecal matter or vomit, and 20.0% (11/55) attended school, pre-school, or childcare during the incubation period for the disease.

Zika virus infection: One confirmed case of zika virus infection was notified in September 2017. The case was in the 30–39 years age group and had travelled to Philippines during the incubation period for the disease.

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Report:

Monthly Notifiable Disease Surveillance Report - Sep 2017

Tables:

Monthly National Totals - September 2017

Monthly DHB Totals - September 2017

Monthly Rolling Totals - September 2017

 

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Monthly Notifiable Disease Surveillance Report - Sep 2017

Tables:

Monthly National Totals - September 2017

Monthly DHB Totals - September 2017

Monthly Rolling Totals - September 2017

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