Monthly Notifiable Disease Surveillance Report - Mar 2017

Sunday 19th November 2017


Key notifiable disease trends

Cronobacter species: One confirmed Cronobacter species was notified in March 2017. The case was a male in the 60–69 years age group from Tairawhiti DHB.

Dengue Fever: Eight cases of dengue fever (7 confirmed and 1 probable) were notified in March 2017 compared to 21 cases notified during the same month of the previous year. All cases had been overseas during the incubation period. The countries visited included Fiji (3 cases), Solomon Islands and Vanuatu (2 cases each), and Malaysia (1 case).

Leptospirosis: 16 cases of leptospirosis (8 confirmed, 1 probable and 7 under investigation) were notified in March 2017 compared to five cases notified during the same month of the previous year (Figure 1). The highest number of cases was reported from Waikato (5 cases) DHB. Cases were reported in the 60–69 years (4 cases), 20–29 years, 30–39 years, 40–49 years, and 50–59 years (3 cases each) age groups. Occupation was recorded for 81.3% (13/16) of cases. Of these, eight were engaged in occupation previously identified as high risk exposure to Leptospira species: farmers or farm workers (7 cases) and meat worker (1 case). One case reported exposure through swimming in stream water and another through time spent camping in a forest. Six cases did not have any risk factor information recorded. The Leptospira species was recorded for four cases which included: L. Ballum, L. Hardjo, L. Pomona, and L. Tarassovi.

Mumps: 30 cases of mumps (20 confirmed, 2 probable and 8 under investigation) were notified in March 2017 compared with one case notified during the same month of the previous year. The cases were reported from Waitemata (15 cases), Counties Manukau (5 cases), Canterbury (3 cases), Auckland, Waikato (2 cases each), and Northland, MidCentral, and Southern DHBs (1 case each). Cases were in the 15–19 years (8 cases), 5–9 years (6 cases), 10–14 years (5 cases), 30–39 years, 40–49 years (3 cases each), 20–29 years (2 cases), less than one year, 1–4 years, and 70 years and over (1 case each) age groups. Ten cases were recorded as immunised of which seven cases had received two doses of the vaccine and three cases had received one dose. One interim mumps virus outbreak (case numbers yet to be determined) was created in March.

Pertussis: 112 cases of pertussis (59 confirmed, 45 probable, 1 suspected, and 7 under investigation) were notified in March 2017 compared to 81 cases in the same month of the previous year. The 12-month rate for the period ending 31 March (24.0 cases per 100,000) was lower than at the same time in the previous year (27.2 per 100,000). Six cases were hospitalised and no deaths were reported. Fifty-one percent (57/112) of cases were laboratory-confirmed (11 by culture, 41 by PCR, and 5 by culture and PCR). The highest number of cases was reported from Southern (16 cases), followed by Capital & Coast (15 cases) and Canterbury (12 cases) DHBs. Cases ranged in age from three months to 86 years, with 14.3% (16/112) under five years of age (including 3 cases aged less than 1 year). The highest numbers of cases were in the 5–9 years (17 cases) and 15–19 years (15 cases) age groups. Three finalised Bordetella pertussis outbreaks (12 cases) and three interim outbreaks (case numbers yet to be determined) were created in March.

Rheumatic fever: Eighteen cases of rheumatic fever - initial attack (14 confirmed, 3 probable and 1 suspect) and one probable case of rheumatic fever – recurrent attack were notified in March 2017. This compares with nine cases (7 initial and 2 recurrent attack) in the same month of the previous year. The cases were reported from Counties Manukau (6 cases), Waikato (4 cases), Waitemata, Auckland, Bay of Plenty (2 cases each), MidCentral, Hutt Valley and Nelson Marlborough (1 case each) DHBs. Cases ranged in age from 6 to 40 years, with the highest number of cases in the 5–9 years (6 cases) and 10–14 years (5 cases) age groups. Cases were reported in the Pacific peoples (10 cases), Māori (8 cases) and European or Other (1 case) ethnic groups. Seventeen 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.

Typhoid fever: Fifteen confirmed cases of typhoid fever were notified in March 2017 compared to four cases notified during the same month of the previous year (Figure 2). Cases were reported from Auckland (9 cases), Counties Manukau (5 cases), and Southern (1 case) DHBs. Age was recorded for 14/15 cases. Cases were in the 20–29 years (4 cases), 5–9 years (3 cases), 1–4 years, 10–14 years (2 cases each), 30–39 years, 50–59 years and 60–69 years (1 case each) age groups. Twelve cases were hospitalised. All cases were lab confirmed, of these 12 cases had the phage type recorded as Salmonella Typhi phage type E1a. Overseas travel information was recorded for all cases, of which five cases reported travelling during the incubation period for the disease, including one case who visited more than one country. Countries visited were India (3 cases), Thailand (2 cases), Myanmar and Samoa (1 case each). One interim Salmonella Typhi outbreak (case numbers yet to be determined) was created in March.

VTEC/STEC infection: 91 cases of VTEC/STEC infection (81 confirmed and 10 under investigation) were notified in March 2017 compared to 55 cases confirmed during the same month of the previous year. The 12-month rate for the period ending 31 March 2017 (9.0 cases per 100,000 population) was the same as the equivalent period for the previous year. The highest numbers of cases were reported from Northland, Southern (15 cases each), Counties Manukau (13 cases), and Waitemata (12 cases) DHBs. Cases ranged in age from three months to 99 years, with the highest number of cases in the 1–4 years (22 cases). Twenty-one cases were hospitalised. Thirty-eight 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 (38 cases) and non-O157 15 cases). Of the cases for which risk factor information was recorded, 73.6% (39/53) had contact with animals, 25.0% (12/48) had recreational contact with water, 25.0% (12/48) had contact with children in nappies, and 13.7% (7/51) had contact with a person with similar symptoms during the incubation periods for the disease. One finalised E. coli O157 outbreak was created in March (2 cases).

Yersiniosis: 82 cases of yersiniosis (80 confirmed, 1 probable, and 1 under investigation) were notified in March 2017 compared to 46 cases notified in the same month of the previous year. The highest numbers of cases were reported from Auckland, Canterbury (11 cases), Bay of Plenty (10 cases) and Hutt valley (9 cases) DHBs. Cases ranged in age from three months to 93 years, with the highest number of cases in the 1–4 years (23 cases), 60–69 years (11 cases), and 50–59 years (9 cases) age groups. Five cases were hospitalised. The Yersinia species involved was identified by ESR for 91.5% (75/82) cases. The most common Y. enterocolitica biotypes reported were Biotype 2 (40 cases), Biotype 4 (15 cases) and Biotype 3 (13 cases). Among the cases for which risk factor information was recorded, 42.9% (18/42) had consumed food from a food premises, 29.3% (12/41) had recreational contact with water, 14.3% (6/42) attended school, preschool or childcare during the incubation period for the disease and 15.8% (6/38) had contact with other faecal matter or vomit. One finalised Yersinia outbreak was created in March (5 cases).

Note: this report has been updated since it was originally published on 20 April 2017. A correction was made under Leptospirosis where the Leptospira species L. Canicola was incorrectly reported, this has now been removed.

Note: Click on the document links below to open. These documents are in PDF format. You will need to download the free Adobe Acrobat Reader to view them.

Report:

Monthly Notifiable Disease Surveillance Report - March 2017

Tables:

Monthly National Totals - March 2017

Monthly DHB Totals - March 2017

Monthly Rolling Totals - March 2017

 

DOWNLOADS

Monthly Notifiable Disease Surveillance Report - March 2017

Tables:

Monthly National Totals - March 2017

Monthly DHB Totals - March 2017

Monthly Rolling Totals - March 2017

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