Monthly Notifiable Disease Surveillance Report - Apr 2017

Sunday 25th June 2017


Key notifiable disease trends

Giardiasis: 125 cases of giardiasis (120 confirmed and 5 under investigation) were notified in April 2017 compared to 144 cases notified during the same month of the previous year. Five hundred and forty-six cases have been notified in the year to date compared to 640 at the same time in the previous year. The highest numbers of cases reported in April were from Waitemata (17 cases), Counties Manukau (16 cases) and Canterbury (15 cases) DHBs. Among the cases for which risk factor information was recorded, 43.2% (19/44) had recreational contact with water, 36.6% (15/41) had contact with faecal matter or vomit, 34.1% (14/41) had consumed untreated water, and 32.6% (14/43) had contact with farm animals during the incubation period. Two finalised Giardia outbreaks (6 cases total) and one interim outbreak (case numbers yet to be determined) were created in April.

Hepatitis NOS: One case of hepatitis NOS (hepatitis delta) was notified in April 2017. The case was a male in the 40–49 years age group from Waitemata DHB.

Legionellosis: 11 cases of legionellosis (8 confirmed and 3 under investigation) were notified in April 2017 compared to 23 cases notified during the previous month, and 23 during the same month of the previous year. Cases were reported from Waitemata (4 cases), Bay of Plenty (3 cases), Counties Manukau (2 cases), Auckland and MidCentral (1 case each) DHBs. The Legionella species was identified for 10 cases as: L. pneumophila (6 cases) and L. longbeachae (4 cases).

Leptospirosis: 14 cases of leptospirosis (8 confirmed, 1 probable and 5 under investigation) were notified in April 2017 compared to eight cases notified during the same month of the previous year. The highest number of cases was reported from Waikato (4 cases) and Canterbury (3 cases) DHBs. Cases were reported in the 20–29 years, 60–69 years (4 cases each), 40–49 years (3 cases), 50–59 years (2 cases) and 30–39 years (1 case) age groups. Occupation was recorded for 71.4% (10/14) of cases. Of these, five were engaged in occupation previously identified as high risk exposure to Leptospira species: farmers or farm workers (4 cases) and veterinarian (1 case). Of the five cases that did not report a high-risk occupation (or had no occupation recorded), three reported contact with farm or wild animals and one had recreational water contact. One case did not have any risk factor information recorded.

Measles: One case of measles (still under investigation) was notified in April compared to 14 cases notified during the same month of the previous year. After further investigation, this case has since been found not to meet case criteria.

Mumps: 30 cases of mumps (29 confirmed and 1 under investigation) were notified in April 2017 compared with one case notified during the same month of the previous year (Figure 1). The cases were reported from Waitemata (19 cases), Counties Manukau (7 cases), Auckland, Waikato, Hutt Valley, and Canterbury DHBs (1 case each). Cases were in the 15–19 years (11 cases), 5–9 years (5 cases), 10–14 years, 30–39 years (4 cases each), 20–29 years (3 cases), 1–4 years (2 cases), and 60–69 years (1 case) age groups. Twelve cases were recorded as being vaccinated against mumps of which seven cases had received two doses of the vaccine and four cases had received just one dose. One further case had been vaccinated, but no dose information was available.

Ross River virus infection: One case of Ross River virus infection was notified in April 2017. The case was a male in the 40–49 years age group from Bay of Plenty DHB. The case reported overseas travel to Australia during the incubation period for the disease.

Typhoid fever: Nineteen cases of typhoid fever (17 confirmed, 1 probable and 1 under investigation) were notified in April 2017 compared to five cases notified during the same month of the previous year (Figure 2). Cases were reported from Counties Manukau (8 cases), Auckland (5 cases), Waitemata, Lakes (2 cases each), Waikato and Canterbury (1 case each) DHBs. Cases were in the 40–49 years (6 cases), 1–4 years, 15–19 years (3 cases each), 20–29 years, 30–39 years (2 cases each), 5–9 years, 10–14 years, and 70 and over (1 case each) age groups. Fourteen cases were hospitalised. Eighty-nine percent (17/19) of cases were lab confirmed and the most common phage types identified were Salmonella Typhi E1a (14 cases). Overseas travel information was recorded for all cases, of which six cases reported travelling during the incubation period for the disease. Countries visited were Samoa (3 cases), India (2 cases), and Indonesia (1 case each). One interim S. Typhi outbreak (case numbers yet to be determined) was created in April.

VTEC/STEC infection: 71 cases of VTEC/STEC infection (59 confirmed and 12 under investigation) were notified in April 2017 compared to 53 cases confirmed during the same month of the previous year. The 12-month rate for the period ending 30 April 2017 (9.2 cases per 100,000 population) was slightly lower than rate for the equivalent period for the previous year (9.4 cases per 100,000 population). The highest numbers of cases were reported from Northland, Southern (14 cases each), Waitemata (10 cases), and Waikato (7 cases) DHBs. Cases ranged in age from nine months to 88 years, with the highest number of cases in the 1–4 years (17 cases). Nineteen cases were hospitalised. Fifty 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 (32 cases) and non-O157 (17 cases). The serotype was undetermined in one case but verocytotoxin was detected by PCR. Of the cases for which risk factor information was recorded, 61.9% (26/42) had contact with animals, 32.4% (12/37) had recreational contact with water, 21.1% (8/38) had contact with a person with similar symptoms, and 17.6% (6/34) had contact with children in nappies during the incubation periods for the disease. One interim VTEC/STEC infection outbreak was created in April (case numbers yet to be determined).

Zika virus infection: 2 confirmed cases of Zika virus infection were notified in April 2017. Cases were reported in the 10–14 years and 60–69 years (1 case each) age groups. Both cases reported overseas travel during the incubation period to Fiji.

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Report:

Monthly Notifiable Disease Surveillance Report - April 2017

Tables:

Monthly National Totals - April 2017

Monthly DHB Totals - April 2017

Monthly Rolling Totals - April 2017

 

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Monthly Notifiable Disease Surveillance Report - April 2017

Tables:

Monthly National Totals - April 2017

Monthly DHB Totals - April 2017

Monthly Rolling Totals - April 2017

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