Monthly Notifiable Disease Surveillance Report - Aug 2017

Thursday 19th September 2019


Key notifiable disease trends

Chikungunya fever: Four cases of chikungunya fever (2 confirmed and 2 under investigation) were notified in August 2017. The cases were from Waitemata (2 cases), Capital & Coast and Canterbury (1 case each) DHBs. Cases were reported in the 30–39 years (2 cases each) 20–29 years and 40–49 years (1 case each) age groups. Four cases reported overseas travel during the incubation period for the disease. Countries visited included Bangladesh, Colombia and Fiji. One of the cases travelled to multiple regions including Southern Europe and Central America.

Cronobacter species: One confirmed Cronobacter species was notified in August 2017. The case was a female in the 70 years and over age group from Bay of Plenty DHB.

Invasive pneumococcal disease: 71 cases of invasive pneumococcal disease (70 confirmed and 1 under investigation) were notified in August 2017 compared to 51 cases notified during the same month of the previous year. The highest numbers of cases were reported from Counties Manukau (9 cases), Auckland (8 cases), Waitemata, Canterbury and Southern (7 cases each) DHBs. The cases ranged in age from 5 months to 97 years, with the highest numbers of cases in the 70 years and over age group (24 cases). Fifty-nine cases were hospitalised and three deaths were reported. Among the cases for which risk factor information was recorded, 52.8% (28/53) had a chronic illness, 35.8% (19/53) were immunocompromised, 18.5% (10/54) were current smokers, and 12.3% (10/57) had chronic lung disease or cystic fibrosis.

Leptospirosis: 10 cases of leptospirosis (5 confirmed and 5 under investigation) were notified in August 2017 compared to nine cases notified during the same month of the previous year. The highest number of cases was reported from Waikato (3 cases) DHB. Cases were reported in the 50–59 years (4 cases), 30–39 years, 60–69 years (2 cases each), 20–29 years, and 40–49 years (1 case each) age groups. Occupation was recorded for 60.0% (6/10) of cases. Of these, four were engaged in occupation previously identified as high risk exposure to Leptospira species: farmers or farm workers (3 cases) and meat worker (1 case). One case reported exposure through contact with wild pigs and sheep. Four cases did not have any risk factor information recorded. The Leptospira species was recorded for six cases which included: L. Hardjo (3 cases), L. Pomona (2 cases), and L. Ballum (1 case).

Mumps: 165 cases of mumps (128 confirmed, 15 probable and 22 under investigation) were notified in August 2017 compared with one case notified during the same month of the previous year (Figure 1). After further investigation eight cases were found not to meet the case criteria. The highest numbers of cases were reported from Counties Manukau (41 cases), Waitemata (33 cases), and Auckland (28 cases) DHBs. The highest number of cases were in the 20–29 years (49 cases), 15–19 years (47 cases), and 10–14 years (19 cases) age groups. Fifty-three cases were recorded as being vaccinated against mumps, of which 37 cases had received two doses of the vaccine and 12 cases had received just one dose. Four further cases had been vaccinated, but no dose information was available. Vaccination status was unknown for 47 cases and 57 cases were recorded as non-vaccinated. One interim outbreak (case numbers yet to be determined) was created in August.

Pertussis: 141 cases of pertussis (76 confirmed, 54 probable, 4 suspected, and 7 under investigation) were notified in August 2017 compared to 83 cases in the same month of the previous year. The 12-month rate for the period ending 31 August (28.1 cases per 100,000) was higher than at the same time in the previous year (24.0 per 100,000). After further investigation two cases were found not to meet the case criteria. Fourteen cases were hospitalised and no deaths were reported. Fifty-four percent (75/139) of cases were laboratory-confirmed (4 by culture, 68 by PCR, and 3 by culture and PCR). The highest number of cases was reported from Southern (29 cases), followed by Canterbury (21 cases) and Waikato (13 cases) DHBs. Cases ranged in age from one month to 84 years, with 18.0% (25/139) under five years of age (including 13 cases aged less than 1 year). The highest numbers of cases were in the 5–9 years (20 cases), 10–14 years (17 cases) and 40–49 years (16 cases) age groups. One finalised Bordetella pertussis outbreak (5 cases) and three interim outbreaks (case numbers yet to be determined) were created in August.

Shigellosis: 20 confirmed cases of shigellosis were notified in August 2017 compared with 21 cases notified during the same month of the previous year. The 12-month rate for the period ending 31 August (5.0 cases per 100,000 population) was higher than at the same time in the previous year (2.9 per 100,000). The highest numbers of cases were reported from Auckland (7 cases) and Counties Manukau (5 cases) DHBs. The serotype involved was recorded for 95.0% (19/20) of cases: S. sonnei biotype g (8 cases), S. flexneri 6 biotype boyd 88, S. sonnei biotype a (3 cases each), S. flexneri 1b, S. flexneri 1c (2 cases each), and S. flexneri 2a (1 case). Information on overseas travel during the incubation period was recorded for 60.0% (12/20) of cases, of which 53.8% (7/12) of cases recorded overseas travel during the incubation period for the disease. Countries visited included: Vanuatu (2 cases), Afghanistan, India, Peru, Samoa, and Vietnam (1 case each). Two cases had travelled to multiple countries which included Brazil, Hong Kong and Argentina. Two finalised Shigella outbreak was created in August (7 cases).

Yersiniosis: 111 cases of yersiniosis (108 confirmed, 1 probable, and 2 under investigation) were notified in August 2017 compared to 79 cases notified in the same month of the previous year (Figure 2). The 12-month rate for the period ending 31 August (20.4 per 100,000 population) was higher than at the same time in the previous year (16.5 per 100,000). After further investigation two cases were found not to meet the case criteria. The highest number of cases was reported from Waitemata (19 cases), Auckland (17 cases), and Canterbury (15 cases) DHBs. Cases ranged in age from seven months to 88 years, with the highest numbers of cases in the 20–29 years (23 cases), 30–39 years, 50–59 years (13 cases each), and 1–4 years (12 cases) age groups. Five cases were hospitalised. The Yersinia species involved was identified by the Enteric Reference Laboratory for 80.7% (88/109) of cases. All cases were identified as Y. enterocolitica. The Y. enterocolitica biotypes reported were biotype 2 (59 cases), biotype 4 (11 cases), biotype 3 (10 cases), and biotype 1A (8 cases). Among the cases for which risk factor information was recorded, 48.8% (20/41) had consumed food from a food premises, 22.2% (10/45) attended school, pre-school, or childcare, and 20.5% (8/39) had contact with faecal matter or vomit during the incubation period for the disease.

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Report:

Monthly Notifiable Disease Surveillance Report - August 2017

Tables:

Monthly National Totals - August 2017

Monthly DHB Totals - August 2017

Monthly Rolling Totals - August 2017

 

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Monthly Notifiable Disease Surveillance Report - August 2017

Tables:

Monthly National Totals - August 2017

Monthly DHB Totals - August 2017

Monthly Rolling Totals - August 2017

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