Monthly Notifiable Disease Surveillance Report - Feb 2017

Tuesday 30th May 2017


Key notifiable disease trends

Campylobacteriosis: 558 cases of campylobacteriosis (546 confirmed, 1 probable and 11 under investigation) were notified in February 2017 compared to 454 cases notified during the same month of the previous year. The highest rates were reported in Hawke’s Bay (822.2 cases per 100,000 population, 24 cases), South Canterbury (299.7 per 100,000, 10 cases) and Southern (196.6 per 100,000, 97 cases) DHBs, compared to a national rate of 159.9 per 100,000. Forty-two people were hospitalised. Cases ranged in age from two months to 96 years, and the highest numbers of cases were reported in the 20–29 years (82 cases) and 50–59 years (79 cases) age groups. One finalised Campylobacter outbreak was created in February (3 cases).

Chikungunya fever: One confirmed case of chikungunya fever was notified in February 2017 compared to two confirmed and one probable case notified during the same month of the previous year. The case reported overseas travel to Fiji during the incubation period.

Dengue Fever: 12 confirmed cases of dengue fever were notified in February 2017 compared to 41 cases notified during the same month of the previous year. All cases had been overseas during the incubation period, including two cases that visited more than one country. The countries visited included Vanuatu (4 cases), Fiji and Thailand (2 cases each), and India, Indonesia, New Caledonia, Papa New Guinea, Solomon Islands, Sri Lanka and Vietnam (1 case each).

Hepatitis A: 10 cases of hepatitis A (6 confirmed and 4 under investigation) were notified in February 2017 compared to seven cases notified during the previous month and two cases notified during the same month of the previous year. Ethnicity was recorded for 90.0% (9/10) of cases and were reported in the following ethnic groups: Pacific peoples (6 cases), Asian (2 cases) and Maori (1 case). Cases were reported in the following DHBs: Counties Manukau (6 cases), Waitemata (2 cases), Auckland and Capital & Coast (1 case each). Cases were reported in the 15–19 years (4 cases), 10–14 years and 20–29 years (2 cases each), 5–9 years and 30–39 years (1 case each) age groups. Five cases travelled overseas during the incubation period. The countries visited included Samoa (2 cases), Pakistan, Philippines and Tonga (1 case each). Four cases reported being in contact with confirmed cases within the previous three months. One interim Hepatitis A outbreak (case numbers yet to be determined) was created in February.


Invasive pneumococcal disease: 23 cases of invasive pneumococcal disease (19 confirmed and 4 under investigation) were notified in February 2017 compared to 13 cases notified during the same month of the previous year. The highest numbers of cases were reported from Waitemata (6 cases), Bay of Plenty (3 cases), Northland, Auckland, Counties Manukau, Waikato, and Canterbury (2 cases each) DHBs. The cases ranged in age from 25 years to 93 years, with the highest numbers of cases in the 70 years and over age group (9 cases). Twenty-one cases were hospitalised and four deaths were reported. Among the cases for which risk factor information was recorded, 58.8% (10/17) had a chronic illness, 16.7% (3/18) had chronic lung disease or cystic fibrosis, and 16.7% (2/12) were current smokers.

Leptospirosis: 11 cases of leptospirosis (5 confirmed, 1 probable and 5 under investigation) were notified in February 2017 compared to four cases notified during the same month of the previous year. The highest number of cases were reported from Hawke’s Bay, Southern and Taranaki (2 cases each) DHBs. Cases were reported in the 20–29 years (4 cases each), 30–39 years, 50–59 (3 cases each), and 70 and over (1 case) age groups. Occupation was recorded for 81.8% (9/11) of cases. Of these, seven were engaged in occupation previously identified as high risk exposure to Leptospira species: farmers or farm workers (6 cases) and meat worker (1 case). One case reported exposure through ingesting/aspirated stream water and another by contact with bats and mice. Two cases did not have any risk factor information recorded. The Leptospira species was recorded for two cases; L. Hardjo and L. Tarassovi.

Measles: Seven confirmed cases of measles were notified in February compared to five cases notified during the same month of the previous year. Cases were reported in the 15–19 years (4 cases), 20–29 years (2 cases) and 50–59 years (1 case) age groups. All cases were from MidCentral DHB. Three cases were recorded as immunised of which two cases had received two doses of the vaccine and one case had received one dose. One interim measles outbreak (case numbers yet to be determined) was created in February.

Mumps: 21 cases of mumps (14 confirmed, 2 probable and 5 under investigation) were notified in February 2017 compared with zero cases notified during the same month of the previous year (Figure 1). The cases were reported from Counties Manukau, Waitemata DHB (6 cases each), Northland (3 cases), Auckland (2 cases), Waikato, Taranaki, Capital & Coast, and Canterbury DHBs (1 case each). Cases were in the 1–4 years, 10–14 years, 20–29 years (4 cases), 15–19 years, 30–39 years (3 cases each), 40–49 years (2 cases) and 5–9 years (1 case) age groups. Seven cases were recorded as immunised of which four cases had received two doses of the vaccine and three cases had received one dose. Two interim mumps virus outbreaks (case numbers yet to be determined) were created in February.

Salmonellosis: 95 cases of salmonellosis (92 confirmed and 3 under investigation) were notified in February 2017 compared to 133 cases notified during the same month of the previous year. The highest numbers of cases were reported from Canterbury (17 cases), Auckland (10 cases), Waitemata, Capital & Coast, and Southern (9 cases each) DHBs. The cases ranged in age from 4 months to 84 years, with the highest numbers of cases in the 1–4 years (19 cases), 20–29 years (15 cases) and 50–59 years (14 cases) age groups. Twelve cases were hospitalised. The Salmonella serotypes were identified in 95.8% (91/95) of cases, the most common were S. Typhimurium phage type 101 (7 cases), S. Saintpaul (6 cases), S. Enteritidis phage type 11 and S. Typhimurium phage type 56 (5 cases each). Among the cases for which risk factor information was recorded, 34.5% (20/58) had travelled overseas during the incubation period for the disease, 33.3% (13/39) had consumed food from a food premises, 32.5% (13/40) had consumed untreated water and 20.0% (8/40) had contact with farm animals.

VTEC/STEC infection: 52 cases of VTEC/STEC infection (49 confirmed and 3 under investigation) were notified in February 2017 compared to 75 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 28 February 2017 (8.2 cases per 100,000 population) was lower than for the same period in the previous year (8.7 cases per 100,000). The highest numbers of cases were reported from Southern (12 cases), Waitemata (9 cases), Auckland and Counties Manukau (6 cases each) DHBs. Cases ranged in age from 5 months to 93 years, with the highest number of cases in the 1–4 years (10 cases). Nine cases were hospitalised. Twenty-two 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 (17 cases) and non-O157 (5 cases). Of the cases for which risk factor information was recorded, 67.7% (21/31) had contact with animals, 39.3% (11/28) had recreational contact with water, and 20.0% (5/25) had contact with children in nappies during the incubation periods for the disease. One finalised E. coli O157 outbreak was created in February (2 cases).


Yersiniosis: 68 cases of yersiniosis (67 confirmed and 1 under investigation) were notified in February 2017 compared to 39 cases notified in the same month of the previous year. The highest numbers of cases were reported from Canterbury (9 cases), Capital & Coast (8 cases) and Waikato (7 cases) DHBs. Cases ranged in age from 3 months to 78 years, with the highest number of cases in the 50–59 years (12 cases), 20–29 years and 60–69 years (11 cases) age groups. Seven cases were hospitalised. The Yersinia species involved was identified by ESR for 91.2% (62/68) cases. The most common Y. enterocolitica biotypes reported were Biotype 2 (34 cases), Biotype 3 (13 cases) and Biotype 4 (10 cases). Among the cases for which risk factor information was recorded, 46.1% (12/26) had consumed food from a food premises, 20.0% (6/30) had recreational contact with water, 18.8% (6/32) attended school, preschool or childcare during the incubation period for the disease and 14.8% (4/27) had contact with other faecal matter or vomit.

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Report:

Monthly Notifiable Disease Surveillance Report - February 2017

Tables:

Monthly National Totals - February 2017

Monthly DHB Totals - February 2017

Monthly Rolling Totals - February 2017

 

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Monthly Notifiable Disease Surveillance Report - February 2017

Tables:

Monthly National Totals - February 2017

Monthly DHB Totals - February 2017

Monthly Rolling Totals - February 2017

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