Monthly Notifiable Disease Surveillance Report - Jun 2017

Sunday 20th August 2017


Key notifiable disease trends

Campylobacteriosis: 369 cases of campylobacteriosis (361 confirmed, 1 probable and 7 under investigation) were notified in June 2017 compared to 334 cases notified during the same month of the previous year. The highest rates were reported in Hawke’s Bay (816.6 cases per 100,000 population, 20 cases), South Canterbury (244.9 per 100,000, 5 cases) and Southern (196.3 per 100,000, 35 cases) DHBs, compared to a national rate of 160.7 per 100,000. Thirty-one people were hospitalised. Cases ranged in age from four months to 93 years, and the highest numbers of cases were reported in the 70 years and over (68 cases) and 20–29 years (55 cases) age groups. One finalised Campylobacter outbreak (3 cases total) was created in June.

Chikungunya fever: One confirmed case of chikungunya fever was notified in June 2017. The case was a male in the 30–39 years age group from South Canterbury DHB. The case reported overseas travel to Indonesia during the incubation period for the disease.

Cryptosporidiosis: 81 cases of cryptosporidiosis (79 confirmed and 2 probable) were notified in June 2017 compared to 48 cases notified during the same month of the previous year. The 12-month rate for the period ending 30 June (23.4 cases per 100,000 population) was higher than at the same time in the previous year (18.8 per 100,000). Cases notified in June ranged in age from 7 months to 79 years, with the highest numbers of cases in the 1–4 years, 30–39 (14 cases each) and 5–9 years (12 cases) age groups. Among the cases for which risk factor information was recorded, 50.0% (25/50) had recreational contact with water, 35.8% (19/53) had attended school, preschool or childcare, and 29.4% (15/51) had contact with other symptomatic people during the incubation period for the disease. One finalised Cryptosporidium outbreak (4 cases) and one interim outbreaks (case numbers yet to be determined) were created in June.

Invasive pneumococcal disease: 60 cases of invasive pneumococcal disease (56 confirmed and 4 under investigation) were notified in June 2017 compared to 48 cases notified during the same month of the previous year. The highest numbers of cases were reported from Auckland (9 cases), Counties Manukau (8 cases) and Capital & Coast (6 cases) DHBs. The cases ranged in age from seven months to 91 years, with the highest numbers of cases in the 70 years and over age group (22 cases). Forty-seven cases were hospitalised and three deaths were reported. Among the cases for which risk factor information was recorded, 58.1% (25/43) had a chronic illness, 18.2% (8/44) had chronic lung disease or cystic fibrosis, and 17.8% (8/45) were immunocompromised

Leprosy: One confirmed leprosy case was notified in June 2017. The case was a male in the 20–29 years age group from Waikato DHB and travelled to Kiribati during the incubation period for the disease.

Leptospirosis: 23 cases of leptospirosis (16 confirmed and 7 under investigation) were notified in June 2017 compared to six cases notified during the same month of the previous year. Due to technical issues with lab notifications 10 of these cases had an onset date of well before June 2017 and therefore will not be included in further analysis. The highest number of cases were reported from Waikato, Canterbury and Waikato DHBs (2 cases). Cases were reported in the 50–59 years (6 cases), 40–49 years (3 cases), 30–39 years (2 cases), 20–20 years and 70 years and over (1 case each) age groups. Occupational exposure risk factor information was recorded for seven cases, all of which reported being exposed. Five were farmers or farm workers and the remaining two cases reported exposure through animals via contact at home and consuming contaminated snow. Four cases did not have any risk factor information recorded. The Leptospira species was recorded for five cases, which were L. Ballum (3 cases), L. Hardjo (1 cases) and L. Tarassovi (1 case).

Meningococcal disease: Thirteen cases of meningococcal disease (12 confirmed and 1 under investigation) were notified in June 2017 compared to four cases notified during the same month of the previous year (Figure 1). Cases were reported from Capital & Coast, Canterbury (3 cases each), Northland, Bay of Plenty (2 cases each), Counties Manukau, Waikato, and Lakes DHBs (1 case each). Cases were in the 1–4 years (5 cases), less than 1 year, 15–19 years, 20–29 years (2 cases each), 5–9 years and 60–69 years age groups (1 case each). All cases were hospitalised and one death was reported. Ninety-two percent of cases (12/13) were laboratory confirmed and the group was determined for 11 cases: group B (9 cases, including 3 NZ B:P1.7-2,4), group C (1 case), and group W (1 case).

Mumps: 48 cases of mumps (36 confirmed, 1 probable and 11 under investigation) were notified in June 2017 compared with zero cases notified during the same month of the previous year (Figure 2). The cases were reported from Waitemata (15 cases), Counties Manukau (12 cases), Auckland (8 cases), Waikato (7 cases), Bay of Plenty, Taranaki, Capital & Coast, Nelson Marlborough, Canterbury and Southern DHBs (1 case each). Cases were in the 15–19 years (16 cases), 20–29 years (12 cases), 10–14 years (10 cases), 40–49 years (5 cases), 1–4 years, 30–39 years, (2 cases each), and 5–9 years (1 case) age groups. Ten cases were recorded as being vaccinated against mumps, of which four cases had received two doses of the vaccine and five cases had received just one dose. One further case had been vaccinated, but no dose information was available. One interim mumps virus outbreak (case numbers yet to be determined) was created in June.

Pertussis: 133 cases of pertussis (66 confirmed, 43 probable, 5 suspect and 19 under investigation) were notified in June 2016 compared to 72 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 for the period ending 30 June (26.4 cases per 100,000) was lower than at the same time in the previous year (27.0 per 100,000). Six cases were hospitalised and no deaths were reported. Fifty-one percent (68/132) of cases were laboratory-confirmed (16 by culture, 44 by PCR, and 8 by culture and PCR). The highest number of cases was reported from Nelson Marlborough, Southern (18 cases each), followed by Waitemata (17 cases) and Auckland (13 cases) DHBs. Cases ranged in age from 1 month to 86 years, with 18.9% (25/132) under 5 years of age (including seven cases aged less than one year). The highest numbers of cases were in the 1–4 years, 5–9 years (18 cases each) and 30–39 years (17 cases) age groups.

VTEC/STEC infection: 34 cases of VTEC/STEC infection (20 confirmed and 14 under investigation) were notified in June 2017 compared to 15 cases confirmed during 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 30 June 2017 (10.1 cases per 100,000 population) was higher than the rate for the equivalent period the previous year (9.9 cases per 100,000 population). The highest numbers of cases were reported from Waitemata (9 cases), Auckland (7 cases), and Counties Manukau (5 cases) DHBs. Cases ranged in age from six months to 81 years, with the highest number of cases in the 1–4 years (6 cases), 60–69 years and 70 years and over (5 cases each) age groups. Five cases were hospitalised. Seventeen 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 non-O157 (10 cases) and O157:H7 (7 cases). Of the cases for which risk factor information was recorded, 90.0% (9/10) had contact with animals, 50.0% (5/10) had contact with a person with similar symptoms, and 16.6% (2/12) had contact with children in nappies during the incubation period for the disease.

Yersiniosis: 65 cases of yersiniosis (62 confirmed and 3 under investigation) were notified in June 2017 compared to 54 cases notified in the same month of the previous year. The 12-month rate for the period ending 30 June (19.6 per 100,000 population) was higher than at the same time in the previous year (16.3 per 100,000). The highest number of cases was reported from Canterbury (10 cases), Waitemata and Counties Manukau (8 cases each) DHB. Cases ranged in age from 2 months to 80 years, with the highest numbers of cases in the 1–4 years (13 cases) less than one years and 50–59 years (9 cases each) age groups. Six cases were hospitalised. The Yersinia species involved was identified by the Enteric Reference Laboratory for 89.2% (58/65) cases; all Y. enterocolitica. The most common Y. enterocolitica biotypes reported were biotype 2 (34 cases), 1A and 3 (10 cases each). Among the cases for which risk factor information was recorded, 30.0% (9/30) had contact with faecal matter or vomit, 26.9% (7/26) had consumed food from a food premises, 19.4% (6/31), attended school, preschool or childcare, and 17.2% (5/29) had recreational contact with water during the incubation period for the disease.

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Report:

Monthly Notifiable Disease Surveillance Report - June 2017

Tables:

Monthly National Totals - June 2017

Monthly DHB Totals - June 2017

Monthly Rolling Totals - June 2017

 

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Monthly Notifiable Disease Surveillance Report - June 2017

Tables:

Monthly National Totals - June 2017

Monthly DHB Totals - June 2017

Monthly Rolling Totals - June 2017

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