Monthly Notifiable Disease Surveillance Report - Oct 2015

Monday 23rd September 2019


Key notifiable disease trends

Chikungunya fever: One confirmed case was notified in October 2015 compared to three confirmed and two probable cases notified during the same month of the previous year. Forty-six cases have been notified in the year to date compared to 19 at the same time in the previous year. The case reported overseas travel to the Cook Islands during the incubation period.

Cryptosporidiosis:164 cases of cryptosporidiosis (159 confirmed, 4 probable and 1 under investigation) were notified in October 2015 compared to 144 cases notified during the same month of the previous year. After further investigation one case has since been found not to meet the case criteria. The highest numbers of cases were reported from Canterbury and Southern (23 cases each), and Waitemata and Waikato (21 cases each) DHBs. The cases ranged in age from 10 months to 87 years, with the highest numbers of cases in the 1–4 years (45 cases), 20–29 years (28 cases) and 5–9 years (23 cases) age groups. Among the cases for which risk factor information was recorded, 76.5% (65/85) had contact with farm animals, 44.4% (32/72) had consumed untreated water, 40.5% (32/79) had contact with faecal matter or vomit, 23.6% (17/72) had contact with other symptomatic people, 19.2% (14/73) had recreational water contact, and 17.9% (12/67) had consumed food from a food premises during the incubation period. Five finalised Cryptosporidium outbreaks (27 cases) and one interim outbreak (case numbers yet to be determined) were created in October.

Gastroenteritis: 27 cases of gastroenteritis (6 confirmed, 18 probable and 3 under investigation) were notified in October 2015, compared to 110 cases notified in the same month of the previous year. After further investigation one case has since been found not to meet the case criteria. A causal agent was confirmed for 15.4% (4/26) cases and the pathogens reported were norovirus (3 cases) and rotavirus (1 case). The highest number of cases were reported in Auckland and Waitemata DHBs (6 cases each). Cases ranged in age from 8 months to 77 years, with the highest numbers of cases reported in the 60–69 years (5 cases), and 20–29 years and 70+ years (4 cases each) age groups. Sixteen finalised gastroenteritisoutbreaks (310 cases) and 15 interim outbreaks (case numbers yet to be determined) were created in October. 

Giardiasis: 120 cases of giardiasis (119 confirmed and 1 under investigation) were notified in October 2015 compared to 107 cases notified during the same month of the previous year. The highest numbers of cases were reported from Waitemata and Canterbury (15 cases each), and Capital and Coast (13 cases) DHBs. Among the cases where risk factor information was recorded, 46.7% (21/45) had contact with faecal matter or vomit, 33.3% (15/45) had recreational water contact, 27.9% (12/43) had contact with other symptomatic people, and 23.7% (9/38) had consumed untreated water during the incubation period. Three finalised Giardia outbreaks (8 cases) were created in October.

Hydatid disease: One case of hydatid disease (under investigation) was notified in October 2015. The case was a female in the 60-69 years age group from Canterbury DHB, and had an historic exposure to farm dogs in New Zealand.

Legionellosis: 28 cases of legionellosis (19 confirmed, 6 probable and 3 under investigation) were notified in October 2015 compared to 16 cases notified during the previous month, and nine during the same month of the previous year (Figure 1). The highest numbers of cases were reported from Bay of Plenty and Canterbury (4 cases each), and Northland and Waikato (3 cases each) DHBs. The Legionella species was identified for 21 cases as: L. longbeachae (14 cases), L. pneumophila and L. jordanis (2 cases each) and L. anisa, L. bozmanii, L. micdadei (1 case each). The increase in legionellosis notifications for the year (153 compared with 82 cases at the same time in 2014) may be due to the LegiNZ study, which began in May 2015 and involves 20 hospitals in 17 DHBs.

Leprosy: One confirmed case of borderline leprosy was notified in October 2015. The case was a male, in the 70+ years age group and from Bay of Plenty DHB. The case has history of overseas travel and is still under investigation.

Measles: Two cases of measles were notified in October 2015 compared to one case notified during the same month of the previous year. After further investigation, both cases have since been found not to meet the case criteria. Eleven cases have been notified in the year to date compared to 277 at the same time in the previous year.   

Pertussis: 96 cases of pertussis were notified in October 2015 compared to 109 cases in the same month of the previous year (Figure 2). After further investigation three cases have since been found not to meet the case criteria. Sixteen cases were hospitalised and no deaths were reported. Sixty-eight percent (63/93) of cases were laboratory-confirmed (22 by isolation, 29 by PCR, and 12 by isolation and PCR). The highest numbers of cases were reported from Canterbury (24 cases), Counties Manukau (18 cases) and Waikato (10 cases) DHBs. Cases ranged in age from 23 days to 87 years, with 19.4% under 5 years of age (including 8 cases aged less than 1 year, of whom 6 were hospitalised). The highest numbers of cases were in the 40–49 years (15 cases), 30–39 years (12 cases), 1–4 years and 5–9 years (10 cases each) age groups. The vaccination status was recorded for 90.0% (36/40) of cases aged under 20 years. Of these, eight were reported as not vaccinated, five received one dose of vaccine, and 20 received three or more doses (including three who had received all five doses). Three cases were immunised but had no dose information recorded. Of the cases where the relevant information was recorded 36.4% (28/77) attended school, pre-school or childcare, and 29.4% (15/51) had contact with a laboratory-confirmed pertussis case.

Rheumatic fever: 11 cases of initial attack rheumatic fever were notified in October 2015, compared to 14 cases during the same month of the previous year. After further investigation one case has since been found not to meet the case criteria. All cases were from the North Island; Counties Manukau (4 cases), Auckland (3 cases), and Hutt Valley, Bay of Plenty and Tairawhiti (1 case each) DHBs. Cases ranged in age from 4 to 41 years, and were in the 10–14 years (4 cases), 5–9 years (3 cases), and 1–4 years, 15–19 years and 40–49 years age groups (1 case each). Cases were reported in the Pacific peoples (8 cases) and Māori (2 cases) ethnic groups. Hospitalisation status was recorded for all cases, of which 90.0% (9/10) 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.  

VTEC/STEC infection:41 cases of VTEC/STEC infection (38 confirmed and 3 under investigation) were notified in October 2015 compared to 17 cases notified during the same month of the previous year. After further investigation one case has since been found not to meet the case criteria. The highest numbers of cases were reported from Waitemata (9 cases), Auckland (6 cases) and Waikato (5 cases) DHBs. The highest numbers of cases occurred in the 1–4 years (11 cases), 20–29 years (6 cases), and 5–9 years and 50–59 years (4 cases each) age groups. Four cases were hospitalised. Thirty cases were confirmed by the Enteric Reference Laboratory as being infected with VTEC/STEC. The serotype was identified for 30 cases as Escherichia coli O157:H7 (14 cases) and non-O157 (16 cases). Among the cases for whom risk factor information was recorded, 84.2% (16/19) had contact with animals, 35.7% (5/14) had contact with children in nappies, and 16.7% (3/18) had contact with a person with similar symptoms. The increase for DHBs in the Auckland region may be due to a recent change in laboratory methods; all faecal specimens are now screened for VTEC/STEC using PCR. One finalised VTEC/STEC outbreak (2 cases) and one interim outbreak (case numbers yet to be determined) were created in October.

Zika virus: One confirmed case was notified in October 2015. The case was a female from Counties Manukau DHB, who reported overseas travel to American Samoa and Samoa during the incubation period.

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 - October 2015

Tables:

Monthly National Totals - October 2015

Monthly DHB Totals - October 2015

Monthly Rolling Totals - October 2015

 

DOWNLOADS

Monthly Notifiable Disease Surveillance Report - October 2015

Tables:

Monthly National Totals - October 2015

Monthly DHB Totals - October 2015

Monthly Rolling Totals - October 2015

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