Monthly Notifiable Disease Surveillance Report - July 2015

Monday 23rd September 2019


Key notifiable disease trends

Chikungunya fever: Two confirmed cases were notified in July 2015 compared to one probable case notified during the same month of the previous year. Both cases reported overseas travel to the Cook Islands during the incubation period.

Dengue fever: Nine cases of dengue fever (7 confirmed, 1 probable, and 1 under investigation) were notified in July 2015 compared to 13 confirmed cases notified in the same month of the previous year. The travel history was recorded for all cases. The countries most commonly visited were Indonesia and Samoa (2 cases each). Some cases reported travel to more than one country.

Giardiasis: 110 confirmed cases of giardiasis were notified in July 2015 compared to 156 cases notified during the same month of the previous year. The highest numbers of cases were reported from Auckland and Counties Manukau (15 cases each), Hawke’s Bay (14 cases), and Waitemata (12 cases) DHBs. Among the cases where risk factor information was recorded, 45.9% (17/37) had contact with faecal matter, 30.6% (11/36) had contact with other symptomatic people during the incubation period, and 28.6% (10/35) had consumed untreated water. Two interim Giardia outbreaks were created in July (case numbers yet to be determined).

Legionellosis: 9 cases were notified in July 2015 (8 confirmed and 1 probable) compared to 18 cases notified during the previous month, and 13 during the same month of the previous year. The highest numbers of cases were reported from Waitemata, Bay of Plenty and Nelson Marlborough DHBs (2 cases each). The Legionella species was identified for all cases as: L. longbeachae (4 cases), L. pneumophila (3 cases), L. gormanii and L. jordanis (1 case each). The increase in legionellosis notifications for the year (102 compared with 61 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.

Measles: No cases of measles were notified in July 2015 compared to two cases notified during the previous month, and 38 during the same month of the previous year (Figure 1).

Meningococcal disease: Six cases of meningococcal disease were notified in July 2015 (5 confirmed and 1 under investigation) compared to three 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 cases were reported from Waitemata (2 cases), Northland, Capital & Coast, and Canterbury (1 case each) DHBs. Five cases were less than 10 years: 1–4 years age group (3 cases), and under 1 year and 5–9 years age groups (1 case each). All cases were hospitalised and no deaths were reported. All cases were laboratory confirmed and the strain type was determined for four cases: group B (3 cases), and group C:P1.5-1,10-8 (1 case).

Pertussis: 122 cases of pertussis were notified in July 2015 compared to 91 cases in the same month of the previous year. After further investigation, 16 cases have since been found not to meet the case criteria. Seven cases were hospitalised and no deaths were reported. There were 55/106 (51.9%) cases laboratory-confirmed (26 by isolation, 20 by PCR, 9 by isolation and PCR). The highest numbers of cases were reported from Southern (31 cases), Canterbury (16 cases), and Waitemata (14 cases) DHBs. The cases ranged in age from 2 months to 79 years, with 22.9% under 5 years old (including 6 cases aged less than 1 year). The highest numbers of cases were in the 1–4 years years (18 cases), and 5–9 years and 10–14 years (15 cases each) age groups. The vaccination status was recorded for 82.5% (47/57) of cases aged under 20 years. Of these, 13 were reported as not vaccinated, three received one dose of vaccine, two received two doses of vaccine, and 29 received three or more doses (including three who had received all five doses). Of the cases where the relevant information was recorded 55.1% (43/78) attended school, pre-school or childcare, and 52.5% (32/61) had contact with a laboratory-confirmed pertussis case. One interim B. pertussis outbreak was created in July (case numbers yet to be confirmed).

Rheumatic fever: 13 cases of rheumatic fever (12 initial attack and 1 recurrent attack) were notified in July 2015, compared to 19 cases during the same month of the previous year. One case has since been denotified. All cases were from the North Island; Counties Manukau (4 cases), Lakes (3 cases), Auckland and Waitemata (2 cases each) and Capital & Coast (1 case) DHBs. Cases ranged in age from 5 to 23 years, and were in the 5–9 years (4 cases), 10–14 years (5 cases), 15–19 years (1 case), and 20–29 years (2 cases) age groups. Cases were reported in Pacific Peoples (7 cases) and Māori (5 case) ethnic groups. Hospitalisation status was recorded for all cases, all of which 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.  

Tuberculosis disease: 26 cases of tuberculosis disease (25 new cases and 1 relapse or reactivation case) were notified in July 2015 compared to 19 cases notified during the same month of the previous year. After further investigation, two cases have since been found not to meet the case criteria. The highest number of cases was reported in the Auckland region (16 cases). The cases ranged in age from 15 to 86 years, with the highest numbers of cases in the 60–69 years (5 cases) age group. Of the cases for which risk factor information was recorded, 73.7% (14/19) of cases were born outside of New Zealand. Nineteen cases were laboratory confirmed. The mycobacterial species was recorded for 11 cases: all were infected with M. tuberculosis.

VTEC/STEC infection: 19 confirmed cases of VTEC/STEC infection were notified in July 2015 compared to seven cases notified during the same month of the previous year. The highest numbers of cases were reported from Counties Manukau (8 cases), and Auckland and Waitemata (4 cases each) DHBs. The highest numbers of cases occurred in the 1–4 years (6 cases), 20–29 years, 50–59 years and 60–69 years (3 cases each) age groups. Three cases were hospitalised. Sixteen cases were confirmed by the Enteric Reference Laboratory as being infected with VTEC/STEC. The serotype was identified as O157:H7 (3 cases) and non-O157 (10 cases). Among the cases for whom risk factor information was recorded, 100.0% (3/3) had contact with animals and 50.0% (1/2) 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.

Yersiniosis: 46 confirmed cases of yersiniosis were notified in July 2015 compared to 35 cases notified during the same month of the previous year (Figure 2). The highest numbers of cases were reported from Counties Manukau and Canterbury DHBs (10 cases each). The cases ranged in age from 2 months to 94 years, with the highest numbers of cases in the 1–4 years (11 cases), less than one year and 70+ years (7 cases each) age groups. Six cases were hospitalised. The Yersinia species involved was identified for 43 (93.5%) cases; 42 were Y. enterocolitica and 1 was Y. pseudotuberculosis. The most common biotypes reported were Y. enterocolitica biotype 4 (12 cases), 2 (12 cases) and 1A (11 cases). Among the cases for which risk factor information was recorded, 46.7% (7/15) had consumed food from a food premises, 27.8% (5/18) had contact with faecal matter or vomit, and 5.6% (1/18) had recreational contact with water during the incubation period.

Zika virus: One case still under investigation was notified in July 2015. The case was a male from Waitemata DHB, who reported overseas travel to Samoa during the incubation period.

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Report:

Monthly Notifiable Disease Surveillance Report - July 2015

Tables:

Monthly National Totals - July 2015

Monthly DHB Totals - July 2015

Monthly Rolling Totals - July 2015

 

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Monthly Notifiable Disease Surveillance Report - July 2015

Tables:

Monthly National Totals - July 2015

Monthly DHB Totals - July 2015

Monthly Rolling Totals - July 2015

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