Monthly Notifiable Disease Surveillance Report - May 2015

Wednesday 18th September 2019


Key notifiable disease trends

Chikungunya fever: One confirmed case was notified in May 2015 compared to four cases notified during the same month of the previous year. The case was a female from Auckland DHB, who reported overseas travel to the Cook Islands during the incubation period.

Giardiasis: 127 cases of giardiasis were notified in May 2015 compared to 195 cases notified during the same month of the previous year. The highest numbers of cases were reported from Waikato and Canterbury (15 cases each), and Waitemata and Counties Manukau (12 cases each) DHBs. Among the cases where risk factor information was recorded, 46.6% (27/58) had contact with faecal matter, 44.7% (21/47) had consumed untreated water, and 42.4% (25/59) had contact with other symptomatic people during the incubation period. Two Giardia outbreaks were created in May including one finalised outbreak (3 cases) and one interim outbreak (case numbers yet to be determined).

Hepatitis NOS: One case of hepatitis NOS (hepatitis delta) was notified in May 2015. The case was a male in the 20–29 years age group from Waitemata DHB, with underlying severe chronic Hepatitis B.

Legionellosis: 24 cases (18 confirmed, 3 probable, and 3 under investigation) were notified in May 2015 compared to 22 cases notified during the previous month, and 10 during the same month of the previous year (Figure 1). The highest number of cases was reported from Canterbury DHB (6 cases), followed by Counties Manukau and Waitemata DHBs (5 cases each). The Legionella species was identified for 20 cases as: L. pneumophila (14 cases), L. longbeachae (4 cases), and L. micdadei (2 cases). The increase in legionellosis notifications may be due to the LegiNZ study, which began in May 2015 and involves 20 hospitals in 17 DHBs.

Leptospirosis: 11 cases of leptospirosis were notified in May 2015 (7 confirmed and 4 under investigation), compared to five cases notified during the same month of the previous year. After further investigation, one case has since been found to not meet the case criteria. The highest numbers of cases were reported from Bay of Plenty and Hawke’s Bay DHBs (2 cases each). Occupational exposure risk factor information was recorded for six cases: farmers or farm workers (5 cases) and freezing worker (1 case). One case that did not record a high-risk occupation had drunk water from a river during a hunting trip prior to becoming ill. Leptospira species were recorded for four cases: L. Ballum (2 cases), L. Copenhageni (1 case), and L. Pomona (1 case).

Listeriosis: Three cases of listeriosis (2 perinatal and 1 non-perinatal) were notified in May 2015. The mothers in the perinatal cases were both of Asian ethnicity, in the 30–39 years age group, and were from Waitemata and Waikato DHBs. One infant survived after delivery at 38 weeks gestation, and the other did not survive and was delivered at 33 weeks gestation. For two cases the serotype of Listeria monocytogenes was identified as serotype 4. The non-perinatal case was a male in the 70 years and over age group from Capital & Coast DHB.

Measles: Five cases of measles were notified in May 2015 (4 confirmed and 1 under investigation), compared to 11 cases notified during the same month of the previous year (Figure 2). After further investigation, the case that was under investigation has since been found to not meet the case criteria. The cases were reported from MidCentral and Waikato DHBs (2 cases each). Cases ranged in age from 12 to 27 years, with two cases in the 20–29 years and two cases in the 10–14 years age groups. One case was hospitalised and no deaths were reported. None of the four cases were recorded as being immunised. Of the cases for which risk factor information was recorded, 50.0% (2/4) reported contact with another measles case in the previous three weeks, 50.0% (2/4) attended school, pre-school or childcare, and 50.0% (2/4) were overseas during the incubation period. One interim measles outbreak was created in EpiSurv in May from Waikato (case numbers yet to be determined) and this outbreak was import related. The two cases in MidCentral DHB were epidemiologically linked and the index case was imported.    

Tuberculosis disease: 33 cases of tuberculosis disease (31 new cases and 2 reactivations) were notified in May 2015 compared to 24 cases notified during the same month of the previous year. Twenty-four cases were laboratory confirmed. The highest number of cases was reported in the Auckland region (16 cases). The cases ranged in age from 3 to 82 years, with the highest numbers of cases in the 20–29 years (10 cases) and 30–39 years (8 cases) age groups. Of the cases for which risk factor information was recorded, 76.9% (20/26) of cases were born outside of New Zealand. All laboratory confirmed cases were infected with M. tuberculosis or M. tuberculosis complex.

Yersiniosis: 36 cases of yersiniosis were notified in May 2015 compared to 20 cases notified during the same month of the previous year. After further investigation, one case has since been found to not meet the case criteria. The highest numbers of cases were reported from Canterbury (15 cases) and Waikato (4 cases) DHBs. The cases ranged in age from 8 months to 93 years, with the highest numbers of cases in the 1–4 years (7 cases), 60–69 years (6 cases), 20–29 years and 30–39 years (5 cases each) age groups. Two cases were hospitalised. The Yersinia species involved was identified for 28 (77.8%) cases; 27 were Y. enterocolitica and 1 was Y. pseudotuberculosis. The most common biotypes reported were Y. enterocolitica biotype 2, 3 and 4 (7 cases each) and 1A (4 cases). Among the cases for which risk factor information was recorded, 30.0% (3/10) had consumed food from a food premises, 9.1% (1/11) had recreational contact with water, and 8.3% (1/12) had contact with faecal matter or vomit during the incubation period.

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Report:

Monthly Notifiable Disease Surveillance Report - May 2015

Tables:

Monthly National Totals - May 2015

Monthly DHB Totals - May 2015

Monthly Rolling Totals - May 2015

 

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Monthly Notifiable Disease Surveillance Report - May 2015

Tables:

Monthly National Totals - May 2015

Monthly DHB Totals - May 2015

Monthly Rolling Totals - May 2015

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