Monthly Notifiable Disease Surveillance Report - July 2016

Saturday 21st September 2019


Key notifiable disease trends

Chikungunya fever: Two confirmed cases of chikungunya fever were notified in July 2016 compared to two cases notified during the same month of the previous year. Seventeen cases have been notified in the year to date compared to 46 at the same time in the previous year. The cases were both female, in the 30–39 years and 40–49 years age groups, from Bay of Plenty and Southern DHBs, respectively. Both cases had travelled during the incubation period for the disease; countries visited were Tonga (1 case), Brazil and Argentina (1 case).

Cryptosporidiosis: 51 confirmed cases of cryptosporidiosis were notified in July 2016 compared to 23 cases notified during the same month of the previous year. The 12-month rate in July (19.4 cases per 100,000) was higher than at the same time in the previous year (12.8 per 100,000). The highest numbers of cases were reported from Capital & Coast (11 cases), Waitemata (10 cases) and Auckland (7 cases) DHBs. Cases ranged in age from 9 months to 74 years, with the highest numbers of cases in the 30–39 years (11 cases), 1–4 years and 20–29 years (9 cases each) age groups. Among the cases for which risk factor information was recorded, 44.4% (12/27) had recreational contact with water, 41.7% (10/24) had consumed food from a food premises, 39.3% (11/28) had contact with farm animals, 21.4% (6/28) had attended school, preschool or childcare, and 20.0% (5/25) had contact with faecal matter or vomit during the incubation period for the disease. One finalised Cryptosporidium outbreak (2 cases) and one interim outbreak (case numbers yet to be determined) were created in July.

Hydatid disease: One probable case of hydatid disease was notified in July 2016. The case was a female in the 30–39 years age group from Counties Manukau DHB. The case migrated from Tonga during childhood, and recent travel to Tonga was recorded.

Invasive pneumococcal disease: 60 cases of invasive pneumococcal disease (58 confirmed and 2 under investigation) were notified in July 2016 compared to 64 cases notified during the same month of the previous year. The highest numbers of cases were reported from Counties Manukau (13 cases), Waitemata and Auckland (8 cases each) DHBs. Cases ranged in age from 4 days to 98 years, with the highest number of cases in the 70+ years age group (24 cases). Forty-eight cases were hospitalised and four deaths were reported. Among the cases for which risk factor information was recorded, 63.8% (30/47) had a chronic illness, 21.7% (10/46) were immunocompromised and 20.5% (8/39) were smokers.

Legionellosis: Nine cases of legionellosis (4 confirmed, 1 probable and 4 under investigation) were notified in July 2016 compared to 18 cases notified during the previous month, and 11 during the same month of the previous year (Figure 1). Cases were reported from Northland (3 cases), Waitemata (2 cases), and Waikato, Capital & Coast, Canterbury and South Canterbury (1 case each) DHBs. The Legionella species was identified for seven cases as: L. pneumophila (5 cases) and L. Longbeachae (2 cases). The increase in notifications for the year to date compared to the same time in the previous year (cumulative total 152 in July 2016 compared to 103 in July 2015) may be due to the LegiNZ study, which began in May 2015 and involves 20 hospitals in 17 DHBs.

Listeriosis: One confirmed case of perinatal listeriosis was notified in July 2016. The mother was in the 30–39 years age group, of New Zealand European ethnicity and from Southern DHB. Gestation information was recorded, the baby was delivered at 29 weeks and survived. The serotype for the case was identified as Listeria monocytogenes serotype O4.

Measles: Seven cases of measles (5 confirmed and 2 under investigation) were notified in July 2016 compared to zero cases notified during the same month of the previous year (Figure 2). After further investigation, two cases have since been found not to meet the case criteria. Cases were reported from Waikato (3 cases), Capital & Coast and Hutt Valley (1 case each) DHBs. Cases were recorded in the less than 1 year (2 cases each), 1–4 years, 5–9 years and 15–19 years (1 case each) age groups. Immunisation information was recorded for 80.0% (4/5) of cases, of which one case (in the 15–19 years age group) was immunised and had received two doses of MMR vaccine. Three cases were linked to the ongoing Waikato outbreak, and two were exposed while on a family holiday in Indonesia.

Pertussis: 71 cases of pertussis (29 confirmed, 29 probable, 6 suspect and 7 under investigation) were notified in July 2016 compared to 102 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 July (26.6 cases per 100,000) was higher than at the same time in the previous year (20.7 per 100,000). Five cases were hospitalised and no deaths were reported. Forty-one percent (29/70) of cases were laboratory-confirmed (4 by culture, 24 by PCR, and 1 by culture and PCR). The highest numbers of cases were reported from Canterbury (17 cases) and Waitemata (13 cases) DHBs. Cases ranged in age from 3 months to 73 years, with 10.0% (7/70) under 5 years of age (including 2 cases aged less than 1 year). The highest number of cases was in the 20–29 years and 40–49 years age groups (12 cases each).

VTEC/STEC infection: 22 confirmed cases of VTEC/STEC infection were notified in July compared to 16 cases confirmed during the same month of the previous year. The 12-month rate in July 2016 (10.3 cases per 100,000) was notably higher than at the same time in the previous year (5.1 per 100,000). Cases were reported from Waitemata (6 cases), Counties Manukau (5 cases), Northland (4 cases), Auckland (3 cases), Bay of Plenty, MidCentral, Canterbury and Southern (1 case each) DHBs. Cases ranged in age from 13 months to 76 years, with the highest number of cases in the 1–4 years age group (6 cases). Three cases were hospitalised. Twenty-one 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 (6 cases) and non-O157 (15 cases). Of the cases for which risk factor information was recorded, 100.0% (7/7) had contact with animals, 42.9% (3/7) had contact with children in nappies, and 33.3% (3/9) 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: 60 confirmed cases of yersiniosis were notified in July 2016 compared to 46 cases notified in the same month of the previous year. The highest numbers of cases were reported from Southern (12 cases) and Canterbury (11 cases) DHBs. Cases ranged in age from 8 months to 85 years, with the highest number of cases in the 1–4 years, 30–39 years and 60–69 years age groups (9 cases each). Four cases were hospitalised. The Yersinia species involved was identified for 83.3% (50/60) cases; Y. enterocolitica (43 cases) and Y. pseudotuberculosis (7 cases). The most common Y. enterocolitica biotypes reported were biotype 2 (27 cases) and 1A (8 cases). Among the cases for which risk factor information was recorded, 56.5% (13/23) had consumed food from a food premises, 25.9% (7/27) had contact with farm animals, 14.8% (4/27) had recreational contact with water, and 8.7% (2/23) had contact with nappies during the incubation period for the disease. One interim Yersinia outbreak was created in July (case numbers yet to be determined).

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Report:

Monthly Notifiable Disease Surveillance Report - July 2016

Tables:

Monthly National Totals - July 2016

Monthly DHB Totals - July 2016

Monthly Rolling Totals - July 2016

 

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Monthly Notifiable Disease Surveillance Report - July 2016

Tables:

Monthly National Totals - July 2016

Monthly DHB Totals - July 2016

Monthly Rolling Totals - July 2016

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