Monthly Notifiable Disease Surveillance Report - Jun 2016

Friday 20th September 2019


Key notifiable disease trends

Chikungunya fever: One confirmed case of chikungunya fever was notified in June 2016 compared to three confirmed and one probable case notified during the same month of the previous year. Fifteen cases have been notified in the year to date compared to 44 at the same time in the previous year. The case was in the 20–29 years age group, from Waitemata DHB and travelled to Fiji during the incubation period for the disease.

Dengue fever: 21 cases of dengue fever (19 confirmed and 2 probable) were notified in June 2016 compared to five cases notified during the same month of the previous year. All cases had been overseas during the incubation period, and countries visited included Indonesia (13 cases), Fiji (3 cases), Samoa (2 cases), Cook Islands, French Polynesia and Papua New Guinea (1 case each). One interim dengue fever outbreak was created in June (case numbers yet to be determined, cases had travelled to Indonesia).

Leptospirosis: Eight cases of leptospirosis (4 confirmed and 4 under investigation) were notified in June compared to two cases notified during the same month of the previous year. Cases were reported from Northland (4 cases), Waikato (2 cases), Bay of Plenty and Southern (1 case each) DHBs. Cases were in the 60–69 years (3 cases), 20–29 years and 40–49 years (2 cases each), and 30–39 years (1 case) age groups. Occupational exposure risk factor information was recorded for 62.5% (5/8) of cases; three were farmers, one was a possum trapper and one was a pest controller. The Leptospira species was recorded for three cases; L. Ballum (3 cases) and L. Canico (1 case). One case had two species recorded.

Listeriosis: Three confirmed cases of listeriosis (2 non-perinatal and 1 perinatal) were notified in June 2016. The non-perinatal cases were in the 50–59 years and 60–69 years age groups, of European or Other ethnicity and from Waitemata and Capital & Coast DHBs, respectively. Risk factor information was recorded, and both had an underlying illness. The mother in the perinatal case was in the 15–19 years age group, of Pacific peoples ethnicity and from Counties Manukau DHB. Gestation information was recorded and the baby was delivered at 34 weeks and survived. The serotype was identified for all cases as Listeria monocytogenes serotype O4.

Measles: 34 cases of measles (32 confirmed and 2 under investigation) were notified in June 2016 compared to two cases notified during the same month of the previous year (Figure 1). Cases were reported from Waikato (22 cases), MidCentral (8 cases), Capital & Coast (2 cases), Counties Manukau and Whanganui (1 case each) DHBs. The highest number of cases were recorded in the 1–4 years (11 cases), 10–14 years and 15–19 years (7 cases each) age groups. All confirmed cases have been linked to the ongoing Waikato outbreak.

Meningococcal disease: Four confirmed cases of meningococcal disease were notified in June 2016 compared to nine cases notified during the same month of the previous year. Cases were reported from Counties Manukau, Waikato, Bay of Plenty and Capital & Coast DHBs (1 case each). Cases were reported in the 1–4 years (3 cases) and less than 1 year (1 case) age groups. All cases were hospitalised and no deaths were reported. All cases were laboratory confirmed and the strain types were as follows: group C (2 cases) and group B (2 cases, including 1 group B:P1.7-2,4). 

Pertussis: 85 cases of pertussis (44 confirmed, 29 probable, 1 suspect and 11 under investigation) were notified in June 2016 compared to 93 cases in the same month of the previous year. After further investigation, one case has since been found not to meet the case criteria. The 12-month rate in June (27.4 cases per 100,000) was higher than at the same time in the previous year (20.8 per 100,000). Four cases were hospitalised and no deaths were reported. Thirty-eight percent (37/84) of cases were laboratory-confirmed (5 by culture, 26 by PCR, and 6 by culture and PCR). The highest number of cases was reported from Canterbury DHB (38 cases). Cases ranged in age from 1 month to 79 years, with 15.5% (13/84) under 5 years of age (including 8 cases aged less than 1 year). The highest numbers of cases were in the 5–9 years (18 cases), 40–49 years and 50–59 years (12 cases each) age groups. Three finalised B. pertussis outbreaks (9 cases total) and one interim outbreak (case numbers yet to be determined) were created in June. The interim outbreak was in Canterbury.

Rickettsial disease: One case of rickettsial disease was notified in June 2016. After further investigation, the case has been updated to a confirmed case of murine typhus. The case was a female in the 50–59 years age group from Waikato DHB and was hospitalised. Overseas travel during the incubation period for the disease was not reported.

Ross River virus infection: One case of Ross River virus infection (under investigation) was notified in June 2016. The case was a female in the 60–69 years age group from West Coast DHB. The case reported overseas travel to Australia during the incubation period for the disease.

Taeniasis: One confirmed case of taeniasis was notified in June 2016. The case was a male in the 50–59 years age group from Counties Manukau DHB. The case reported overseas travel to Thailand during the incubation period for the disease.

Typhoid fever: Four confirmed cases of typhoid fever were notified in June 2016 compared to two cases notified during the same month of the previous year. Cases were reported from Auckland (2 cases), Bay of Plenty and Capital & Coast (1 case each) DHBs. Cases were in the 20–29 years (2 cases), 50–59 years and 70 years and over (1 case each) age groups. Three cases were hospitalised. All cases were lab confirmed and the species was recorded as Salmonella Typhi. Overseas travel information was recorded for 75.0% (3/4) cases, of which 2 cases reported travelling during the incubation period for the disease. Countries visited were India and Pakistan (1 case each).

VTEC/STEC infection: 20 confirmed cases of VTEC/STEC infection were notified in June compared to 11 cases confirmed during the same month of the previous year (Figure 2). The 12-month rate in June (10.2 cases per 100,000) was notably higher than at the same time in the previous year (5.0 per 100,000). Cases were reported from Counties Manukau (4 cases), Waitemata (3 cases), Auckland, Waikato and Lakes (2 cases each), Northland, Bay of Plenty, Hawke’s Bay, MidCentral, Nelson Marlborough, Canterbury and Southern (1 case each) DHBs. Cases ranged in age from 11 months to 74 years, with the highest numbers of cases in the 1–4 years and 40–49 years age groups (4 cases each). Six cases were hospitalised. Thirteen 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 (8 cases) and non-O157 (5 cases). Of the cases for which risk factor information was recorded, 50.0% (7/14) had contact with animals, 33.3% (3/9) had contact with children in nappies, and 23.1% (3/13) had contact with a person with similar symptoms. The increase in notifications for DHBs in the Auckland region may be due to a change in laboratory methods in July 2015; all faecal specimens are now screened for VTEC/STEC using PCR.

Yersiniosis: 56 cases of yersiniosis (54 confirmed and 2 under investigation) were notified in June 2016 compared to 31 cases notified in the same month of the previous year. After further investigation two cases have since been found not to meet the case criteria. The highest numbers of cases were reported from Waitemata (12 cases) and Canterbury (8 cases) DHBs. Cases ranged in age from 4 months to 86 years, with the highest numbers of cases in the 1–4 years and 20–29 years age groups (10 cases each). Two cases were hospitalised. The Yersinia species involved was identified for 88.9% (48/54) cases; all were Y. enterocolitica. The most common biotypes reported were Y. enterocolitica biotype 2 (32 cases), 1A (7 cases) and 4 (6 cases). Among the cases for which risk factor information was recorded, 50.0% (11/22) had consumed food from a food premises, 31.8% (7/22) had contact with faecal matter or vomit, and 20.7% (6/29) had contact with farm animals.

Zika virus infection: Two confirmed cases of zika virus infection were notified in June 2016. Cases were reported in the 15–19 years and 50–59 years age groups (1 case each) and both were confirmed by PCR. Both cases travelled during the incubation period for the disease, and countries visited were Fiji (1 case), Nicaragua and the United States of America (1 case).

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 - June 2016

Tables:

Monthly National Totals - June 2016

Monthly DHB Totals - June 2016

Monthly Rolling Totals - June 2016

 

DOWNLOADS

Monthly Notifiable Disease Surveillance Report - June 2016

Tables:

Monthly National Totals - June 2016

Monthly DHB Totals - June 2016

Monthly Rolling Totals - June 2016

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