Monthly Notifiable Disease Surveillance Report - May 2016

Friday 20th September 2019


Key notifiable disease trends

Chikungunya fever: Five confirmed cases of chikungunya fever were notified in May 2016 compared to one confirmed case notified during the same month of the previous year. Fourteen cases have been notified in the year to date compared to 40 at the same time in the previous year. All cases travelled during the incubation period for the disease, and countries visited were Fiji (3 cases), Brazil, India and United States of America (1 case each). One case travelled to more than one country.

Cryptosporidiosis: 77 cases of cryptosporidiosis (75 confirmed and 2 under investigation) were notified in May 2016 compared to 25 cases notified during the same month of the previous year (Figure 1). The 12-month rate in May (18.2 cases per 100,000) was higher than at the same time in the previous year (13.1 per 100,000). The highest numbers of cases were reported from Waitemata (22 cases), Counties Manukau and Waikato (10 cases each), and Northland, Auckland and Canterbury (7 cases each) DHBs. The cases ranged in age from 9 months to 68 years, with the highest numbers of cases in the 1–4 years (19 cases), 30–39 years (16 cases), 20–29 years (11 cases) and 5–9 years (10 cases) age groups. Among the cases for which risk factor information was recorded, 37.5% (9/24) had consumed food from a food premises, 32.4% (11/34) had recreational contact with water, 27.9% (12/43) had contact with farm animals, and 25.7% (9/35) had attended school, preschool or childcare.

Dengue fever: 19 confirmed cases of dengue fever were notified in May 2016 compared to four cases notified during the same month of the previous year. All cases had been overseas during the incubation period, with a number of cases visiting more than one country. The countries visited included Indonesia (12 cases), Papua New Guinea (3 cases), Solomon Islands (2 cases), and Chile, Cook Islands, Fiji, India, Brazil, Thailand and Vanuatu (1 case each). One finalised dengue fever outbreak (4 cases) was created in May.

Hepatitis A: Eight cases of hepatitis A (7 confirmed and 1 under investigation) were notified in May 2016 compared to one case notified during the previous month and two cases notified during the same month of the previous year. The cases were reported from Auckland (3 cases), Nelson Marlborough (2 cases), and Northland, Counties Manukau and Canterbury (1 case each) DHBs. All confirmed cases were laboratory confirmed. Ethnicity was recorded for 62.5% (5/8) cases, and were reported as being in Pacific Peoples (2 cases), and Māori, Asian and European or Other (1 case each) ethnic groups. The cases ranged in age from 2 to 58 years, with the highest number of cases in the 20–29 years age group (3 cases). Six of the confirmed cases had travelled during the incubation period for the disease, and countries visited were Solomon Islands (2 cases), and Republic of Korea, New Caledonia, Pakistan, Singapore, Mexico, Papua New Guinea, and Viet Nam (1 case each). Three cases had travelled to more than one country. The remaining confirmed case had consumed frozen berries.

Invasive pneumococcal disease: 45 cases of invasive pneumococcal disease (43 confirmed and 2 under investigation) were notified in May 2016 compared to 27 cases notified during the same month of the previous year. The highest numbers of cases were reported from Counties Manukau (8 cases) and Auckland (6 cases) DHBs. The cases ranged in age from 5 months to 91 years, with the highest numbers of cases in the 70+ years age group (16 cases). Thirty-six cases were hospitalised and no deaths were reported. Among the cases for which risk factor information was recorded, 64.7% (22/34) had a chronic illness, 20.6% (7/34) were immunocompromised and 16.7% (5/30) were smokers.

Legionellosis: 18 cases of legionellosis (11 confirmed, 4 probable and 3 under investigation) were notified in May 2016 compared to 24 cases notified during the previous month, and 23 during the same month of the previous year. Cases were reported from Counties Manukau and Canterbury (4 cases each), Northland (3 cases), Southern (2 cases) and Waitemata, Auckland, Wairarapa, Hutt Valley and South Canterbury (1 case each) DHBs. The Legionella species was identified for 10 cases as: L. Longbeachae (7 cases), L. pneumophila (2 cases), and L. micdadei (1 case). The increase in legionellosis notifications compared to the same time in the previous year may be due to the LegiNZ study, which began in May 2015 and involves 20 hospitals in 17 DHBs.

Listeriosis: Four cases of non-perinatal listeriosis (3 confirmed and 1 under investigation) were notified in May 2016. The cases were in the 70 years and over (2 cases), and under one years and 60–69 years (1 case each) age groups. Cases were reported from Counties Manukau, Bay of Plenty, Hutt Valley and Southern (1 case each) DHBs. The serotype was identified for three cases as Listeria monocytogenes serotype O4 (2 cases) and Listeria monocytogenes serotype O1/2 (1 case).

Measles: 47 cases of measles (42 confirmed and 5 under investigation) were notified in May 2016 compared to four cases notified during the same month of the previous year. After further investigation, three cases have since been found not to meet the case criteria. Cases were reported from Waikato (22 cases), MidCentral (13 cases), Northland (6 cases) and Nelson Marlborough (3 cases) DHBs.

Meningococcal disease: Eight cases of meningococcal disease were notified in May 2016 compared to no cases notified during the same month of the previous year. Cases were reported from Southern (5 cases), and Waitemata, Counties Manukau and Capital & Coast (1 case each) DHBs. Cases were reported in the 15–19 years and 70+ years (2 cases each) and 20–29 years, 40–49 years, 50–59 years and 60–69 years (1 case each) age groups. All cases were hospitalised and one death was reported. All cases were laboratory confirmed and the strain types were as follows: group B (6 cases, including 3 group B:P1.7-2,4), and group Y (2 cases).

Pertussis: 73 cases of pertussis (25 confirmed, 37 probable, 6 suspect and 5 under investigation) were notified in May 2016 compared to 65 cases in the same month of the previous year. The 12-month rate in May (27.5 cases per 100,000) was higher than at the same time in the previous year (20.6 per 100,000). However, the number of notifications has continued to decrease since the 125 notifications in January 2016. 10 cases were hospitalised and no deaths were reported. Thirty-six percent (26/73) of cases were laboratory-confirmed (17 PCR, 6 by culture and 3 by PCR and culture). The highest numbers of cases were reported from Canterbury (20 cases), Waikato (11 cases), Capital & Coast (8 cases) and Nelson Marlborough (7 cases) DHBs. The cases ranged in age from 1 month to 82 years, with 17.8% (13/73) under 5 years of age (including 5 cases aged less than 1 year). The highest numbers of cases were in the 40–49 years (12 cases) and 30–39 years (9 cases) age groups.

Rheumatic fever: 24 cases of rheumatic fever (21 initial attack and 3 recurrent attack) were notified in May 2016 compared to 19 cases in the same month of the previous year. All cases except one were from the North Island: Counties Manukau (11 cases), and Waitemata, Auckland, Lakes and Capital & Coast (2 cases each), and Northland, Waikato, Bay of Plenty, MidCentral and Canterbury (1 case each) DHBs. The cases ranged in age from 6 to 27 years, with the highest numbers of cases in the 10–14 years age group (10 cases). Cases were reported in the Pacific Peoples (15 cases) and Māori (9 cases) ethnic groups. All cases 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.

Ross River virus infection: Two confirmed cases of Ross River virus infection were notified in May 2016. One case was a male in the 40–49 years age group from Waitemata DHB. The other case was a male in the 60–69 years age group from Nelson Marlborough DHB. Both cases had travelled during the incubation period to Fiji and Australia, respectively.

Taeniasis: One confirmed case of taeniasis was notified in May 2016. The case was a male in the 30–39 years age group from Capital & Coast DHB. The case reported overseas travel to Thailand during the incubation period for the disease.

VTEC/STEC infection: 38 cases of VTEC/STEC infection (33 confirmed and 5 under investigation) were notified in May compared to 15 cases confirmed during the same month of the previous year. The 12-month rate in May (10.0 cases per 100,000) was notably higher than at the same time in the previous year (5.0 per 100,000). The highest numbers of cases were reported from Counties Manukau (9 cases), Waitemata (8 cases) and Waikato (7 cases) DHBs. The cases ranged in age from 2 to 84 years, with the highest numbers of cases in the 30–39 years (6 cases) and 1–4 years, 20–29 years and 70+ years (5 cases each) age groups. Fifteen cases were hospitalised. Thirty-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 and non-O157 (15 cases each). Of the cases for which risk factor information was recorded, 68.4% (13/19) had contact with animals, 25.0% (3/12) had contact with children in nappies, and 9.5% (2/21) 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: 68 cases of yersiniosis (64 confirmed and 4 under investigation) were notified in May 2016 compared to 35 cases notified in the same month of the previous year (Figure 2). The highest numbers of cases were reported from Canterbury (11 cases), Auckland and Capital & Coast (9 cases each) and Waitemata (7 cases) DHBs. The cases ranged in age from 10 months to 91 years, with the highest numbers of cases in the 30–39 years (13 cases), 1–4 years (9 cases) and 70+ years (8 cases) age groups. Two cases were hospitalised. The Yersinia species involved was identified for 86.8% (59/68) cases; all were Y. enterocolitica. The most common biotypes reported were Y. enterocolitica biotype 2 (36 cases), 4 (14 cases), and 1A (7 cases). Among the cases for which risk factor information was recorded, 40.9% (9/22) had consumed food from a food premises, 29.2% (7/24) had contact with faecal matter or vomit, and 26.9% (7/26) had contact with farm animals.

Zika virus infection: Seven cases of zika virus infection (6 confirmed and 1 under investigation) were notified in May 2016. Cases were reported in the 30–39 years (5 cases), 20–29 years and 50–59 years (1 case each) age groups. All cases except one were confirmed by PCR. All cases travelled during the incubation period for the disease, and countries visited were Fiji (6 cases) and Indonesia (1 case).

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Report:

Monthly Notifiable Disease Surveillance Report - May 2016

Tables:

Monthly National Totals - May 2016

Monthly DHB Totals - May 2016

Monthly Rolling Totals - May 2016

 

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Monthly Notifiable Disease Surveillance Report - May 2016

Tables:

Monthly National Totals - May 2016

Monthly DHB Totals - May 2016

Monthly Rolling Totals - May 2016

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