Monthly Notifiable Disease Surveillance Report - Dec 2017

Saturday 24th February 2018


Key notifiable disease trends

Dengue Fever: 29 confirmed cases of dengue fever were notified in December 2017 compared to 6 cases notified in December 2016. All cases had been overseas during the incubation period. The countries visited included Samoa (23 cases), India, Thailand (2 cases each), Australia, Cambodia, Fiji, Indonesia, Laos and Vanuatu (1 case each). Three cases reported overseas travel to more than one country.

Hepatitis A: 10 cases of hepatitis A (8 confirmed and 2 under investigation) were notified in December 2017 compared to four cases notified in December 2016. The cases were reported from Waitemata (3 cases), Waikato, Canterbury (2 cases each), Northland, Auckland and Counties Manukau (1 case each) DHBs. All cases were laboratory confirmed. Ethnicity was recorded for 80.0% (8/10) cases, and were reported as being in European or Other (4 cases), Asian (2 cases), Māori, and Pacific peoples (1 case each). The cases ranged in age from 2 to 43 years, with the highest number of cases in the 20–29 years (3 cases), 1–4 years, and 30–39 years age groups (2 cases each). Risk factor information was recorded for seven cases: overseas travel (4 cases), contact with a confirmed case (2 cases) , and attending a pre-school or childcare (1 case). One interim hepatitis A outbreak (case numbers yet to be determined) was created in December.

Leptospirosis: 11 cases of leptospirosis (5 confirmed, 1 probable, and 5 under investigation) were notified in December 2017 compared to seven cases notified in December 2016. The cases were reported in the 50–59 years (4 cases) and 15–19 years, 20­–29 years, 30–39 years (2 cases each), and 60–69 (1 case) years age groups. Occupation was recorded for all cases. Of these, 8 were engaged in occupation previously identified as high risk exposure to Leptospira species: meat workers (5 cases) and farmers or farm workers (3 case). Two cases reported exposure through animal contact. One case did not have any risk factor information recorded.

Meningococcal disease: 14 cases of meningococcal disease (13 confirmed and 1 under investigation) were notified in December 2017 compared to four cases notified in December 2016. The highest number of cases were reported from Waitemata (3 cases), Auckland, Counties Manukau, and Whanganui (2 cases each) DHBs. The highest number of cases were in the 1–4 years (6 cases), 15–19 years (3 years) and less than one year (2 cases) age groups. Thirteen cases were hospitalised and one death was reported. Twelve cases were laboratory confirmed and the group was determined for all of these cases: group B (5 cases, including 1 NZ B:P1.7-2,4), group C (4 cases), group Y (2 cases), and group W (1 case).

Mumps: 190 cases of mumps (87 confirmed, 40 probable and 63 under investigation) were notified in December 2017 compared with eight cases notified in December 2016 (Figure 1). The 12-month rate for the period ending 31 December was 29.0 cases per 100,000 population. The highest numbers of cases were reported from Counties Manukau (89 cases), Auckland (37 cases), and Waitemata (32 cases) DHBs. The highest numbers of cases were in the 20–29 years (78 cases) and 15–19 years (32 cases) age groups. Forty-one cases were recorded as being vaccinated against mumps, of which 35 cases had received two doses of the vaccine and three cases had received just one dose. Three further cases had been vaccinated, but no dose information was available and 20 cases were recorded as non-vaccinated. Vaccination status was unknown for 89 cases. Two final mumps outbreaks (5 cases) was created in December

Pertussis: 522 cases of pertussis (261 confirmed, 162 probable, 15 suspected, and 84 under investigation) were notified in December 2017 compared to 120 cases in December 2016 (Figure 2). The 12-month rate for the period ending 31 December (46.5 cases per 100,000) was higher than for the same period in the previous year (23.3 per 100,000). Thirty-one cases were hospitalised and no deaths were reported. Forty-nine percent (256/522) of cases were laboratory-confirmed (28 by culture, 217 by PCR, and 11 by culture and PCR). The highest number of cases was reported from Nelson Marlborough DHB (135 cases), followed by Canterbury (51 cases), Waikato (49 cases) and Bay of Plenty (45 cases) DHBs. Cases ranged in age from 1 month to 86 years, with 16.5% (86/522) under five years of age (including 32 cases aged less than 1 year). The highest numbers of cases were in the 10–14 years (82 cases), 5–9 years (73 cases), 40–49 years (60 cases) and 1–4 years (54 cases) age groups.

Rheumatic fever: Fourteen cases of rheumatic fever - initial attack (6 confirmed, 3 probable, 3 suspect and 2 under investigation) were notified in December 2017. This compares with nine cases (3 initial attack) in December 2016. The cases were reported from Waikato (4 cases), Counties Manukau (3 cases), Waitemata (2 cases), Auckland, Bay of Plenty, Hawke’s Bay, Hutt Valley and Capital & Coast (1 case each) DHBs. Cases ranged in age from 6 to 25 years, with cases in the 10–14 years (5 cases), 5–9 cases, 20–29 cases (4 cases each) and 15–19 years (1 case) age groups. Cases were reported in the Māori (7 cases), Pacific peoples (5 cases) and European or Other (2 case) ethnic groups. Thirteen 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: 27 cases of shigellosis (26 confirmed and 1 probable) were notified in December 2017 compared with 21 cases notified in December 2016. The 12-month rate for the period ending 31 December (5.3 cases per 100,000 population) was higher than at the same time in the previous year (3.7 per 100,000). The highest number of cases was reported from Auckland (12 cases) DHB. The serotype involved was recorded for 88.9% (24/27) of cases: S. sonnei biotype g (10 cases), S. flexneri 1b (8 cases), S. boydii 13, S. boydii 4, S. boydii 8, S. flexneri 2a, S. flexneri 6 biotype Boyd 88, S. sonnei biotype a (1 case each). Information on overseas travel during the incubation period was recorded for 77.8% (21/27) of cases, of which 52.4% (11/21) of cases recorded overseas travel during this period. Countries visited included: India (4 cases), Tonga (3 cases), Egypt, Indonesia, Myanmar, Singapore, Thailand, United States of America, and Vanuatu, (1 case each). Two cases reported overseas travel to more than one country. One interim Shigella outbreak (case numbers yet to be determined) was created in December.

VTEC/STEC infection: 43 cases of VTEC/STEC infection (30 confirmed and 13 under investigation) were notified in December 2017 compared to 17 cases notified in December 2016. The 12-month rate for the period ending 31 December 2017 (11.9 cases per 100,000 population) was higher than at the same time period in the previous year (8.9 cases per 100,000 population). The highest numbers of cases were reported from Southern (16 cases) and Waitemata (11 cases) DHBs. Cases ranged in age from 5 months to 92 years, with the highest number of cases in the 70 years and over (12 cases) age group. Eleven cases were hospitalised. Sixteen 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 non-O157 (9 cases) and O157:H7 (7 cases). A further 29 cases were confirmed via PCR testing. Of the cases for which risk factor information was recorded, 66.7% (12/18) had contact with animals and 31.3% (5/16) had recreational contact with water.

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Report:

Monthly Notifiable Disease Surveillance Report - Dec 2017

Tables:

Monthly National Totals - December 2017

Monthly DHB Totals - December 2017

Monthly Rolling Totals - December 2017

 

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Monthly Notifiable Disease Surveillance Report - Dec 2017

Tables:

Monthly National Totals - December 2017

Monthly DHB Totals - December 2017

Monthly Rolling Totals - December 2017

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