Monthly Notifiable Disease Surveillance Report - Dec 2016

Monday 24th April 2017


Key notifiable disease trends

Campylobacteriosis: 796 cases of campylobacteriosis (789 confirmed, 3 probable and 4 under investigation) were notified in December 2016 compared to 756 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 rates were reported in Hawke’s Bay (830.5 cases per 100,000 population, 37 cases), South Canterbury (256.0 per 100,000, 13 cases) and Taranaki (203.6 per 100,000, 38 cases) DHBs, compared to a national rate of 162.3 per 100,000. Fifty-six people were hospitalised. Cases ranged in age from 1 month to 97 years, and the highest numbers of cases were reported in the 20–29 years (127 cases) and 50–59 years (110 cases) age groups. Two finalised Campylobacter outbreaks (8 cases total) and one interim outbreak (case numbers yet to be determined) were created in December.

Chikungunya fever: One confirmed case of chikungunya fever was notified in December 2016. Twenty-eight cases have been notified in the year compared to 48 in the previous year. The case was a female in the 70 years and over age group from Bay of Plenty DHB. The case reported overseas travel to India during the incubation period for the disease.

Cryptosporidiosis: 48 confirmed cases of cryptosporidiosis were notified in December 2016 compared to 32 cases notified during the same month of the previous year. The 12-month rate for the period ending 31 December (23.1 cases per 100,000 population) was higher than at the same time in the previous year (15.1 per 100,000). Cases notified in December ranged in age from 10 months to 85 years, with the highest numbers of cases in the 1–4 years (17 cases) and 30–39 years (10 cases) age groups. Among the cases for which risk factor information was recorded, 56.5% (13/23) had recreational contact with water, 47.8% (11/23) had contact with other symptomatic people, and 35.0% (7/20) had attended school, preschool or childcare during the incubation period for the disease. One finalised Cryptosporidium outbreak (2 cases) and two interim outbreaks (case numbers yet to be determined) were created in December.

Haemophilus influenzae serotype b disease: Seven cases of H. influenzae serotype b disease were notified in December 2016. After further investigation, all cases have since been found not to meet the case criteria.

Hepatitis NOS: One confirmed case of hepatitis NOS (hepatitis D) was notified in December 2016. The case was a male in the 40–49 years age group from Counties Manukau DHB and was known to have chronic Hepatitis B.

Listeriosis: One confirmed case of perinatal listeriosis and two cases of non-perinatal listeriosis (1 confirmed and 1 under investigation) were notified in December 2016. The mother in the perinatal case was in the 30–39 years age group and was from Canterbury DHB. Intrauterine death occurred and the foetus was delivered at 24 weeks. The non-perinatal cases were in the 30–39 years and 70 years and over age groups, and were from Capital & Coast and Nelson Marlborough DHBs, respectively. Risk factor information was recorded for one non-perinatal case; the case had an underlying illness. The serotype was identified for the perinatal case and the confirmed non-perinatal case as L. monocytogenes serotype O1/2.

Meningococcal disease: Four confirmed cases of meningococcal disease were notified in December 2016 compared to five cases notified during the same month of the previous year (Figure 1). Cases were reported from Auckland, Hawke’s Bay, MidCentral and Capital & Coast DHBs (1 case each). Cases were in the less than 1 year, 1–4 years, 40–49 years and 70 years and over age groups (1 case each). All cases were hospitalised and no deaths were reported. All cases were laboratory confirmed and the group was determined for all cases: group B (4 cases, including 2 NZ B:P1.7-2,4).

Pertussis: 124 cases of pertussis (68 confirmed, 51 probable and 5 under investigation) were notified in December 2016 compared to 88 cases in the same month of the previous year. After further investigation, three cases have since been found not to meet the case criteria. The 12-month rate for the period ending 31 December (24.0 cases per 100,000) was lower than at the same time in the previous year (25.4 per 100,000). Twelve cases were hospitalised and no deaths were reported. Sixty percent (72/121) of cases were laboratory-confirmed (11 by culture, 57 by PCR, and 4 by culture and PCR). The highest number of cases was reported from Capital & Coast (30 cases), followed by Canterbury (27 cases) and Southern (16 cases) DHBs. Cases ranged in age from 23 days to 91 years, with 12.4% (15/121) under 5 years of age (including 5 cases aged less than 1 year). The highest numbers of cases were in the 10–14 years (22 cases) and 5–9 years (17 cases) age groups. Two finalised B. pertussis outbreaks (8 cases total) and one interim outbreak (case numbers yet to be determined) were created in December. 

Shigellosis: 21 confirmed cases of shigellosis were notified in December compared with four cases notified during the same month of the previous year (Figure 2). The 12-month rate for the period ending 31 December (3.8 cases per 100,000 population) was higher than at the same time in the previous year (2.4 per 100,000). The highest numbers of cases were reported from Auckland (6 cases) and Waitemata (5 cases) DHBs. The serotype involved was recorded for all cases: S. sonnei biotype g (11 cases), S. flexneri 6 biotype Boyd 88 (5 cases), S. flexneri 1b (2 cases), S. sonnei, S. sonnei biotype a and S. sonnei biotype f (1 case each). Information on overseas travel during the incubation period was recorded for 85.7% (18/21) of cases, of which 44.4% (8/18) of cases recorded overseas travel during the incubation period for the disease. Countries visited included: Samoa (2 cases), Indonesia, Nicaragua, Philippines, Tonga and Viet Nam (1 case each). One case reported overseas travel to more than one country (North America nfd, Mexico and Cuba). One finalised Shigella outbreak was created in December (5 cases).

VTEC/STEC infection: 20 cases of VTEC/STEC infection (19 confirmed and 1 under investigation) were notified in December compared to 35 cases confirmed during the same month of the previous year (Figure 2). After further investigation, one case has since been found not to meet the case criteria. The 12-month rate for the period ending 31 December (9.2 cases per 100,000 population) was higher than for the same period in the previous year (7.2 per 100,000). The highest numbers of cases were reported from Counties Manukau (5 cases) and Waitemata (4 cases) DHBs. Cases ranged in age from 12 months to 86 years, with the highest number of cases in the 1–4 years and 60–69 years age groups (4 cases each). Three cases were hospitalised. Fifteen 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 (4 cases) and non-O157 (8 cases). Three cases have verocytotoxin detected but a serotype has not yet been identified. Of the cases for which risk factor information was recorded, 84.6% (11/13) had contact with animals, 23.1% (3/13) had recreational contact with water, 21.4% (3/14) had contact with a person with similar symptoms, and 14.3% (1/7) had contact with children in nappies during the incubation period for the disease. One finalised VTEC/STEC outbreak was created in December (2 cases).

Yersiniosis: 70 cases of yersiniosis (68 confirmed and 2 under investigation) were notified in December 2016 compared to 41 cases notified in the same month of the previous year. After further investigation, one case has since been found to not meet the case criteria. The 12-month rate for the period ending 31 December (18.7 per 100,000 population) was higher than at the same time in the previous year (13.8 per 100,000). The highest number of cases was reported from Auckland DHB (11 cases). Cases ranged in age from 6 months to 81 years, with the highest numbers of cases in the 50–59 years (14 cases) and 1–4 years (13 cases) age groups. Eight cases were hospitalised. The Yersinia species involved was identified by ESR for 87.0% (60/69) cases; Y. enterocolitica (59 cases) and Y. pseudotuberculosis (1 case). The most common Y. enterocolitica biotypes reported were biotype 2 (38 cases) and 1A (12 cases). Among the cases for which risk factor information was recorded, 59.4% (19/32) had consumed food from a food premises, 28.1% (9/32) had recreational contact with water, 23.3% (7/30) had contact with faecal matter or vomit, and 12.9% (4/31) attended school, preschool or childcare during the incubation period for the disease.

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 - December 2016

Tables:

Monthly National Totals - December 2016

Monthly DHB Totals - December 2016

Monthly Rolling Totals - December 2016

 

DOWNLOADS

Monthly Notifiable Disease Surveillance Report - December 2016

Tables:

Monthly National Totals - December 2016

Monthly DHB Totals - December 2016

Monthly Rolling Totals - December 2016

Email us at survqueries@esr.cri.nz to be notified when reports are published. Please specify the reports you are interested in:

- NZ Public Health Surveillance Report
- Monthly Surveillance Report
- Annual Surveillance Summary
- Annual Summary of Outbreaks
- Annual STI Report
- Quarterly STI Clinic Report
- Quarterly STI Lab Report

For the Weekly Influenza Update report please check here each Thursday.

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