Monthly Notifiable Disease Surveillance Report - Jan 2016

Tuesday 17th September 2019


Key notifiable disease trends

Campylobacteriosis: 720 cases of campylobacteriosis (708 confirmed and 12 under investigation) were notified in January 2016 compared to 676 cases notified during the same month of the previous year (Figure 1). For the 12 month period ending 31 January 2016, the highest rates were in West Coast (241.6 per 100,000 population, 79 cases), South Canterbury (221.8 per 100,000 population, 130 cases) and Taranaki (197.6 per 100,000 population, 229 cases) DHBs, compared to a national rate of 136.3 per 100,000 population. No campylobacteriosis outbreaks were created in January.

Dengue fever: 16 cases of dengue fever (15 confirmed and 1 under investigation) were notified in January 2016 compared to 28 cases notified in the same month of the previous year. The travel history was recorded for all cases, and all cases had travelled overseas during the incubation period for the disease. The countries visited included: Samoa (9 cases), Australia, French Polynesia and the Philippines (2 cases each). Some cases reported travel to more than one country.

Legionellosis: 40 cases of legionellosis (26 confirmed and 14 probable) were notified in January 2016 compared to 51 cases notified during the previous month, and 7 during the same month of the previous year (Figure 2). The highest numbers of cases were reported from Waitemata (7 cases), Bay of Plenty (6 cases) and Capital and Coast (5 cases) DHBs. The Legionella species was identified for 22 cases as: L. longbeachae (18 cases) and L. pneumophila (4 cases). 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.

Paralytic shellfish poisoning: One probable case of paralytic shellfish poisoning was notified in January 2016. The case was a male in the 50–59 years age group from Lakes DHB. The case was hospitalised. The case had consumed kina and paua collected from the Bay of Plenty coastline.

Pertussis: 127 cases of pertussis (67 confirmed, 49 probable, 2 suspect and 9 under investigation) were notified in January 2016 compared to 61 cases in the same month of the previous year. After further investigation, one case has since been found not to meet the case criteria. Eleven cases were hospitalised and no deaths were reported. Fifty-six percent (71/126) of cases were laboratory-confirmed (16 by culture, 39 by PCR, and 16 by culture and PCR). The highest numbers of cases were reported from Canterbury (42 cases), Capital and Coast (19 cases) and Waikato (17 cases) DHBs. The cases ranged in age from 1 month to 80 years, with 23.8% (30/127) under 5 years of age (including 15 cases aged less than 1 year). The highest numbers of cases were in the 5–9 years (18 cases), <1 year, 1–4 years, 40–49 years and 50–59 years (15 cases each) age groups. The vaccination status was recorded for 90.5% (57/63) of cases aged under 20 years. Of these, 27 were reported as not vaccinated, four received one dose of vaccine, two received two doses of vaccine, and 22 received three or more doses (including three who had received all five doses). Two cases were immunised but had no dose information recorded. Of the cases where the relevant information was recorded, 41.8% (28/67) had contact with a laboratory-confirmed case, and 17.8% (19/107) had attended school, pre-school or childcare. Two finalised B. pertussis outbreaks were created in January (2 cases each).

Rheumatic fever: 12 cases of rheumatic fever (11 initial attack and 1 recurrent attack) were notified in January 2016, compared to 9 cases during the same month of the previous year. After further investigation, two cases have since been found not to meet the case criteria. All cases except one were from the North Island: Auckland and Counties Manukau (2 cases each), Bay of Plenty, Hawke’s Bay, Southern, Tairawhiti, Waikato and Waitemata (1 case each) DHBs. Cases ranged in age from 9 to 24 years, and were reported in the 10–14 years (7 cases), 20–29 years (2 cases) and 5–9 years (1 case) age groups. Cases were reported in Pacific Peoples (5 cases), Māori (4 cases) and European or Other (1 case) ethnic groups. Hospitalisation status was recorded for all cases, of which 90.0% (9/10) 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. 

Rickettsial disease: Two confirmed cases of rickettsial disease were notified in January 2016. The cases were females in the 30–39 years and 60–69 years age groups. One case was hospitalised. One case reported overseas travel to Australia during the incubation period. The other case is under review.

Toxic shellfish poisoning: One suspect case of toxic shellfish poisoning was notified in January 2016. The case was a male in the 40–49 years age group from Nelson Marlborough DHB. The case had consumed fresh mussels purchased from a local retailer but others who consumed the same meal were not affected. Because the case was a late notification tracking and testing of the mussels was not able to be done.

Tuberculosis disease: 26 cases of tuberculosis disease (all new cases) were notified in January 2016 compared to 20 cases notified during the same month of the previous year. The highest number of cases was reported in the Auckland region (9 cases). The cases ranged in age from 12 to 87 years, with the highest numbers of cases reported in the 20–29 years age group (8 cases). Of the cases for which risk factor information was recorded, 80.0% (16/20) of cases were born outside of New Zealand. Nineteen cases were laboratory confirmed, and of these the mycobacterial species was recorded for 11 cases as M. tuberculosis. One death due to tuberculosis disease (new case) was reported in January (Table 3).

Haemorrhagic fever with renal syndrome: One probable case was notified in January 2016. The case was a male in the 40–49 years age group, who reported overseas travel to the People’s Republic of China during the incubation period for the disease.

VTEC/STEC infection:40 cases of VTEC/STEC infection (37 confirmed and 3 under investigation) were notified in January 2016 compared to 19 cases notified during the same month of the previous year. The highest numbers of cases were reported from Waitemata (14 cases), Auckland (6 cases), Bay of Plenty, Counties Manukau and Northland (4 cases each) DHBs. The highest numbers of cases occurred in the 60–69 years (8 cases), 1–4 years (6 cases) and 20–29 years (5 cases) age groups. Eleven cases were hospitalised. Thirty-one cases were confirmed by the Enteric Reference Laboratory as being infected with VTEC/STEC, and of these the serotype was identified as Escherichia coli O157:H7 (13 cases) and non-O157 (18 cases). Among the cases for which risk factor information was recorded, 66.7% (10/15) had contact with animals, 40.0% (6/15) had recreational contact with water, 26.7% (4/15) 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 recent change in laboratory methods; all faecal specimens are now screened for VTEC/STEC using PCR. One interim VTEC/STEC outbreak (case numbers yet to be determined) was created in January.

Zika virus infection: 10 confirmed cases of zika virus infection were notified in January 2016. Cases were reported in the 40–49 years (3 cases), 20–29 years and 50–59 years (2 cases each), 1–4 years, 10–14 years and 60–69 years (1 case each) age groups. All cases were confirmed by the Clinical Virology lab by PCR. All cases reported overseas travel during the incubation period, and countries visited included Samoa (5 cases), Tonga (4 cases) and American Samoa (1 case).

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Report:

Monthly Notifiable Disease Surveillance Report - January 2016

Tables:

Monthly National Totals - January 2016

Monthly DHB Totals - January 2016

Monthly Rolling Totals - January 2016

 

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Monthly Notifiable Disease Surveillance Report - January 2016

Tables:

Monthly National Totals - January 2016

Monthly DHB Totals - January 2016

Monthly Rolling Totals - January 2016

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