Monthly Notifiable Disease Surveillance Report - Jul 2017

Saturday 23rd September 2017


Key notifiable disease trends

Campylobacteriosis: 441 cases of campylobacteriosis (434 confirmed and 7 under investigation) were notified in July 2017 compared to 342 cases notified during the same month of the previous year. The highest rates were reported in Hawke’s Bay (825.3 per 100,000, 28 cases), South Canterbury (243.2 per 100,000, 5 cases) and Southern (206.0 per 100,000, 47 cases) DHBs, compared to a national rate of 162.8 per 100,000. Thirty-seven people were hospitalised. Cases ranged in age from two months to 99 years, and the highest numbers of cases were reported in the 70 years and over (63 cases), 60–69 years (60 cases), and 50–59 years (59 cases) age groups. One finalised Campylobacter outbreak (3 cases total) was created in July.

Chikungunya fever: two cases of chikungunya fever (1 confirmed and 1 under investigation) were notified in July 2017. After further investigation, one case has since been found to not meet the case criteria. The confirmed case was a male in the 40–49 years age group from Auckland DHB and reported overseas travel to Bangladesh during the incubation period for the disease.

Cryptosporidiosis: 57 cases of cryptosporidiosis (46 confirmed, 10 probable, and 1 under investigation) were notified in July 2017 compared to 51 cases notified during the same month of the previous year. The 12-month rate for the period ending 31 July (23.6 cases per 100,000 population) was higher than at the same time in the previous year (19.0 per 100,000). Cases notified in July ranged in age from 12 months to 62 years, with the highest numbers of cases in the 1–4 years (22 cases) and 30–39 (12 cases) age groups. Among the cases for which risk factor information was recorded, 53.8% (21/39) had recreational contact with water, 40.0% (12/30), had contact with other symptomatic people, and 30.0% (9/30) had attended school, preschool or childcare during the incubation period for the disease. Three finalised Cryptosporidium outbreaks (23 cases) were created in July.

Hydatid disease: one probable case of hydatid disease was notified in July 2017. The case was female, in the 60–69 years age group, and from Bay of Plenty DHB. The case was likely to have acquired the disease in India.

Invasive pneumococcal disease: 92 cases of invasive pneumococcal disease (90 confirmed and 2 under investigation) were notified in July 2017 compared to 61 cases notified during the same month of the previous year (Figure 1). The highest numbers of cases were reported from Waitemata (16 cases), Bay of Plenty (12 cases) and Canterbury (11 cases) DHBs. The cases ranged in age from 12 months to 93 years, with the highest numbers of cases in the 70 years and over age group (30 cases). Eighty cases were hospitalised and two deaths were reported. Among the cases for which risk factor information was recorded, 58.3% (42/72) had a chronic illness, 20.0% (15/75) had chronic lung disease or cystic fibrosis, 16.1% (10/62) were current smokers, and 15.4 (10/65) were immunocompromised.

Legionellosis: 22 cases of legionellosis (8 confirmed, 1 probable, and 13 under investigation) were notified in July 2017 compared to 12 cases notified during the previous month, and seven during the same month of the previous year. The highest number of cases were reported from Auckland (7 cases), Waitemata (4 cases), and Canterbury (3 cases) DHBs.

Mumps: 80 cases of mumps (54 confirmed, 22 probable and 4 under investigation) were notified in July 2017 compared with zero cases notified during the same month of the previous year (Figure 2). The highest numbers of cases were reported from Counties Manukau (32 cases), Waitemata (13 cases), and Auckland (13 cases) DHBs. Cases were in the 20–29 years (22 cases), 5–9 years (15 cases), 10–14 years (13 cases), 15–19 years (11 cases), 1–4 years, 30–39 years (5 cases each), 40–49 years (4 cases), 50–59, 60–69, (2 cases each), and less than one year (1 case) age groups. Thirty-four cases were recorded as being vaccinated against mumps, of which 26 cases had received two doses of the vaccine and six cases had received just one dose. Two further cases had been vaccinated, but no dose information was available. Vaccination status was unknown for 26 cases and 20 cases were recorded as non-vaccinated.

Shigellosis: 30 confirmed cases of shigellosis were notified in July 2017 compared with eight cases notified during the same month of the previous year. The 12-month rate for the period ending 31 July (5.0 cases per 100,000 population) was higher than at the same time in the previous year (2.6 per 100,000). The highest numbers of cases were reported from Auckland and Counties Manukau (7 cases each) DHBs. The serotype involved was recorded for 96.7% (29/30) of cases: S. sonnei biotype g (10 cases), S. flexneri 6 biotype boyd 88 (5 cases), S. flexneri 1b (4 cases), S. flexneri 1c, S. sonnei biotype a (3 cases each), S. flexneri 2b (2 cases), S. flexneri 1a, and S. flexneri 3a (1 case each). Information on overseas travel during the incubation period was recorded for 70.0% (21/30) of cases, of which 71.4% (15/21) of cases recorded overseas travel during the incubation period for the disease. Countries visited included: India (4 cases), Samoa (3 cases), Indonesia (3 cases), Fiji (2 cases), Cambodia, Peru, and Tonga (1 case each). One further case had a prior history of travel to Samoa. One finalised Shigella outbreak was created in July (4 cases).

Taeniasis: one confirmed case of taeniasis was notified in July 2017. The case was a male in the 30–39 years age group from Auckland DHB. The case had travelled to Ethiopia during the incubation period for the disease.

Toxic shellfish poisoning: one suspect case of toxic shellfish poisoning was notified in July 2017. The case was a female in the 20–29 years age group from Bay of Plenty DHB. The case had consumed fresh pipis collected from Ohiwa Harbour.

Yersiniosis: 66 cases of yersiniosis (63 confirmed and 3 under investigation) were notified in July 2017 compared to 60 cases notified in the same month of the previous year. The 12-month rate for the period ending 31 July (19.7 per 100,000 population) was higher than at the same time in the previous year (16.2 per 100,000). The highest number of cases was reported from Waitemata (13 cases), Canterbury (9 cases), and Waikato (7 cases) DHB. Cases ranged in age from seven months to 88 years, with the highest numbers of cases in the 1–4 years, 30–39 (11 cases each), 20–29, and 70 years and over (8 cases each) age groups. Two cases were hospitalised. The Yersinia species involved was identified by the Enteric Reference Laboratory for 81.8% (54/66) of cases; 52 cases were identified as Y. enterocolitica and two Y. pseudotuberculosis. The Y. enterocolitica biotypes reported were biotype 2 (25 cases), biotype 1A (12 cases), and biotype 4 (8 cases), and biotype 3 (7 cases). Among the cases for which risk factor information was recorded, 31.8% (7/22) had consumed food from a food premises and 20.0% (5/25) had contact with faecal matter or vomit during the incubation period for the disease.

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Report:

Monthly Notifiable Disease Surveillance Report - July 2017

Tables:

Monthly National Totals - July 2017

Monthly DHB Totals - July 2017

Monthly Rolling Totals - July 2017

 

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Monthly Notifiable Disease Surveillance Report - July 2017

Tables:

Monthly National Totals - July 2017

Monthly DHB Totals - July 2017

Monthly Rolling Totals - July 2017

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