Monthly Notifiable Disease Surveillance Report - Jan 2018

Tuesday 19th June 2018


Key notifiable disease trends

Chikungunya fever: Two cases of chikungunya fever (1 confirmed and 1 under investigation) were notified in January 2018. The cases were in the 30–39 years and 50–59 years age group and had travelled to Cambodia, Thailand and Vietnam during the incubation period. One case reported travel to more than one country.

Dengue Fever: 112 cases of dengue fever (102 confirmed, 4 probable, and 6 cases still under investigation) were notified in January 2018 compared to nine cases notified in January 2017 (Figure 1). All confirmed and probable cases had been overseas during the incubation period. The countries visited included Samoa (89 cases), Fiji (9 cases), Tonga (4 cases), Philippines (3 cases), Australia and Myanmar (1 case each). Two cases reported overseas travel to more than one country.

Mumps: 105 cases of mumps (43 confirmed, 37 probable, and 25 under investigation) were notified in January 2018 compared with 11 cases notified in January 2017 (Figure 2). The 12-month rate for the period ending 31 January was 30.6 cases per 100,000 population. The highest numbers of cases were reported from Auckland (29 cases), Counties Manukau, and Waitemata (26 cases each), DHBs. The highest numbers of cases were in the 20–29 years (37 cases) and 15–19 years (14 cases) age groups. Eleven cases were recorded as being vaccinated against mumps, of which seven cases had received two doses of the vaccine and three cases had received just one dose. One further cases had been vaccinated, but no dose information was available and nine cases were recorded as non-vaccinated. Vaccination status was unknown for 85 cases.

Paratyphoid fever: Four confirmed cases of paratyphoid fever were notified in January 2018 compared to zero cases notified in January 2017. The cases were reported from Waitemata, Counties Manukau, Capital & Coast, and Canterbury, , (1 case each) DHB. Cases ranged in age from 17 to 29 years, with the highest numbers of cases in the 20–29 years (3 cases) age groups. No cases were hospitalised. The Salmonella Paratyphi serotypes involved were identified by the Enteric Reference Laboratory for all cases: S. Paratyphi A (3 cases) and S. Paratyphi B (1 case). Information on overseas travel during the incubation period was recorded for 75.0% (3/4). Countries visited included: India (2 cases) and Argentina (1 case).

Pertussis: 507 cases of pertussis (310 confirmed, 158 probable, 6 suspected, and 33 still under investigation) were notified in January 2018 compared to 93 cases in January 2017 (Figure 3). The 12-month rate for the period ending 31 January (54.7 cases per 100,000) was higher than for the same period in the previous year (22.7 per 100,000). Thirty-six cases were hospitalised and no deaths were reported. Fifty-seven percent (291/507) of cases were laboratory-confirmed (15 by culture, 268 by PCR, and 8 by culture and PCR). The highest number of cases was reported from Nelson Marlborough DHB (72 cases), followed by Waikato (70 cases), and Bay of Plenty (55 cases) DHBs. Cases ranged in age from 19 days to 93 years, with 19.9% (101/507) under five years of age (including 30 cases aged less than 1 year). The highest numbers of cases were in the 1–4 years, 40–49 years (71 cases each), and 5–9 years (65 cases) age groups.

Shigellosis: 40 cases of shigellosis (37 confirmed and 3 probable) were notified in January 2018 compared with 21 cases notified in January 2017. The 12-month rate for the period ending 31 January (5.7 cases per 100,000 population) was higher than at the same time in the previous year (3.8 per 100,000). The highest number of cases was reported from Waitemata and Auckland (9 cases each) DHBs. The serotype involved was recorded for 82.5% (33/40) of cases: S. flexneri biotype 1b (10 cases), S. sonnei biotype a (8 cases), S. sonnei biotype g (7 cases), S. flexneri 6 biotype Boyd 88 (4 cases), S. flexneri 2a (2 cases), and S. boydii 2, S. dysenteriae 13 (1 case each). Fifty-two percent of cases (21/40) had been overseasduring the incubation period. Countries visited included: Samoa, Tonga (4 cases each), India (3 cases), Australia, Kenya, Philippines (2 cases each), Cambodia, Cuba, Indonesia, Pakistan, Peru, United Arab Emirates, United Kingdom, United states of America and Vietnam (1 case each). Three cases reported overseas travel to more than one country.

STEC infection: 96 cases of STEC infection (72 confirmed and 24 under investigation) were notified in January 2018 compared to 25 cases notified in January 2017 (Figure 4). The 12-month rate for the period ending 31 January 2018 (13.3 cases per 100,000 population) was higher than at the same time period in the previous year (8.7 cases per 100,000 population). The highest numbers of cases were reported from Auckland (19 cases) and Waitemata (14 cases) DHBs. Cases ranged in age from 6 months to 89 years, with the highest number of cases in the 20–29 years and 70 years and over (17 cases each) age groups. Eighteen cases were hospitalised. Thirty-six cases have been confirmed by the Enteric Reference Laboratory as being infected with STEC, and of these the serotype was identified as Escherichia coli O157:H7 (24 cases) and non-O157 (12 cases). A further 35 cases were confirmed via PCR testing. Of the cases for which risk factor information was recorded, 73.9% (34/46) had contact with animals, 39.5% (17/43) had recreational contact with water, and 23.3% (10/43) had contact with children in nappies. Two final STEC outbreak (19 cases) were created in January.

Yersiniosis: 104 cases of yersiniosis (101 confirmed, and 3 under investigation) were notified in January 2018 compared to 68 cases notified in January 2017. The highest numbers of cases were reported from Canterbury (27 cases), Waitemata (14 cases), and Capital & Coast (11 cases) DHBs. Cases ranged in age from five months to 91 years, with the highest number of cases in the 1–4 years (21 cases) and 50–59 years (19 cases) age groups. Seven cases were hospitalised. The Yersinia species involved was identified by ESR for 81.7% (85/104) cases. The most common Y. enterocolitica biotypes reported were biotype 2/3 serotype O:9 (57 cases), biotype 4 serotype O:3 (16 cases), biotype 1A (9 cases) and biotype 2/3 serotype O:5, 27 (3 cases). Among the cases for which risk factor information was recorded, 41.4% (12/29) had consumed food from a food premises and 21.2% (7/33) had recreational contact with water during the incubation period.

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Report:

Monthly Notifiable Disease Surveillance Report - Jan 2018

Tables:

Monthly National Totals - January 2018

Monthly DHB Totals - January 2018

Monthly Rolling Totals - January 2018

 

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Monthly Notifiable Disease Surveillance Report - Jan 2018

Tables:

Monthly National Totals - January 2018

Monthly DHB Totals - January 2018

Monthly Rolling Totals - January 2018

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