Monthly Notifiable Disease Surveillance Report - Jan 2017

Sunday 19th November 2017


Key notifiable disease trends

Brucellosis: One confirmed case of brucellosis was notified in January 2017. The case was a female from Counties Manukau DHB, who reported overseas travel to Syria during the incubation period.

Campylobacteriosis: 663 cases of campylobacteriosis (654 confirmed and 9 under investigation) were notified in January 2017 compared to 720 cases notified during the same month of the previous year. The highest rates were reported in Hawke’s Bay (821.8 cases per 100,000 population, 22 cases), South Canterbury (237.2 per 100,000, 12 cases) and Taranaki (195.0 per 100,000, 17 cases) DHBs, compared to a national rate of 161.0 per 100,000. Sixty-six people were hospitalised. Cases ranged in age from two months to 95 years, and the highest numbers of cases were reported in the 20–29 years (107 cases) and 50–59 years (91 cases) age groups.

Dengue Fever: Nine confirmed cases of dengue fever were notified in January 2017 compared to 15 cases notified during the same month of the previous year. All cases had been overseas during the incubation period, including one case who visited more than one country. The countries visited included Vanuatu (3 cases), Thailand (2 cases), and Fiji, Indonesia, New Caledonia, Singapore, Sri Lanka, (1 case each).

Hepatitis A: Seven confirmed cases of hepatitis A were notified in January 2017 compared to four cases notified during the previous month and two cases notified during the same month of the previous year. Ethnicity was recorded for 71.4% (5/7) of cases and were reported in the following ethnic groups: Pacific Peoples (4 cases) and European or Other (1 case). Cases were reported in the following DHBs: Counties Manukau (4 cases), Waikato, Capital & Coast, and Canterbury (1 case each). Cases were reported in the 20–29 years (3 cases), 10–14 years, 15–19 years, 30–39 years and 70 years and over (1 case each) age groups. Four cases travelled overseas during the incubation period, including one case who visited more than one country. The countries visited included Samoa (2 cases), Fiji, England and Spain. Two cases reported consuming supermarket bought mussels and another case had been in contact with family who had been overseas.

Invasive pneumococcal disease: 35 cases of invasive pneumococcal disease (34 confirmed and 1 under investigation) were notified in January 2017 compared to 23 cases notified during the same month of the previous year. The highest numbers of cases were reported from Counties Manukau and Waikato (6 cases each) and Bay of Plenty (5 cases) DHBs. The cases ranged in age from 10 days to 95 years, with the highest numbers of cases in the 70 years and over age group (12 cases). Thirty-one cases were hospitalised and four deaths were reported. Among the cases for which risk factor information was recorded, 69.0% (20/29) had a chronic illness, 20.0% (6/30) had chronic lung disease or cystic fibrosis, and 19.2% (5/26) were immunocompromised.

Leprosy: One confirmed leprosy case was notified in January 2017. The case was a male in the 30–39 years age group from Southern DHB. The case travelled to the Philippines during the incubation period.

Leptospirosis: 11 cases of leptospirosis (8 confirmed, 1 probable and 2 under investigation) were notified in January 2017 compared to three cases notified during the same month of the previous year (Figure 1). The highest number of cases was reported from Waikato DHB (4 cases). Cases were reported in the 30–39 years (4 cases), 40–49 years (3 cases), 50–59 years (2 cases) and 20–20 years and 60–69 years (1 case each) age groups. Occupational exposure risk factor information was recorded for all cases of which eight reported being exposed, six were farmers or farm workers, one worked in the meat processing industry, and one was an agricultural sprayer. The remaining cases reported exposure through animals via drenching calves, and swimming in a stream. One case did not have any risk factor information recorded. The Leptospira species was recorded for four cases all of which were L. Hardjo.

Mumps: 11 cases of mumps (9 probable and 2 under investigation) were notified in January 2017 compared with zero cases notified during the same month of the previous year. The cases were reported from Waitemata DHB (5 cases), Northland Auckland, Counties Manukau, Lakes, Hutt Valley, and Canterbury DHBs (1 case each). Cases were in the 20–29 years (4 cases), 10–14 years and 15–19 years (2 cases each), 1–4 years, 30–39 years, and 50–59 years (1 case each). Four cases were recorded as immunised. One case had received two doses of the vaccine, and the remaining three cases had been vaccinated, but no dose information was available. One finalised mumps virus outbreak (3 cases) was created in January.
Pertussis: 93 cases of pertussis (58 confirmed, 32 probable and 3 under investigation) were notified in January 2017 compared to 123 cases in the same month of the previous year (Figure 2). The 12-month rate for the period ending 31 January 2017 (23.2 cases per 100,000 population) was lower than at the same time in the previous year (26.8 per 100,000). Nine cases were hospitalised and no deaths were reported. Fifty-four percent (50/93) of cases were laboratory-confirmed (8 by culture, 33 by PCR, and 9 by culture and PCR). The highest number of cases was reported from Canterbury (20 cases), followed by Southern (14 cases) and Taranaki (10 cases) DHBs. Cases ranged in age from 1 month to 77 years, with 20.4% (19/93) under 5 years of age (including 5 cases aged less than 1 year). The highest numbers of cases were in the 5–9 years (16 cases), 40–49 years (15 cases), and 1–4 years (14 cases) age groups. Three finalised Bordetella pertussis outbreaks (16 cases total) were created in January.

VTEC/STEC infection: 26 cases of VTEC/STEC infection (25 confirmed and 1 under investigation) were notified in January 2017 compared to 36 cases confirmed during the same month of the previous year. The 12-month rate for the period ending 31 January 2017 (8.9 cases per 100,000 population) was higher than for the same period in the previous year (7.6 per 100,000). The highest numbers of cases were reported from Southern (7 cases) and Counties Manukau (5 cases) DHBs. Cases ranged in age from 13 months to 87 years, with the highest number of cases in the 20–29 years (6 cases). Six 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 O157:H7 (11 cases) and non-O157 (5 cases). Of the cases for which risk factor information was recorded, 60.0% (12/20) had contact with animals, 23.8% (5/21) had recreational contact with water, and 11.8% (2/17) had contact with children in nappies during the incubation periods for the disease.

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Report:

Monthly Notifiable Disease Surveillance Report - January 2017

Tables:

Monthly National Totals - January 2017

Monthly DHB Totals - January 2017

Monthly Rolling Totals - January 2017

 

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Monthly Notifiable Disease Surveillance Report - January 2017

Tables:

Monthly National Totals - January 2017

Monthly DHB Totals - January 2017

Monthly Rolling Totals - January 2017

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