Monthly Notifiable Disease Surveillance Report - Feb 2016

Saturday 21st September 2019


Key notifiable disease trends

Chikungunya fever: Three cases of chikungunya fever (2 confirmed and 1 probable) were notified in February 2016 compared to nine confirmed and one probable case notified during the same month of the previous year. Three cases have been notified in the year to date compared to 31 at the same time in the previous year. The cases reported overseas travel to Fiji (3 cases) and the Solomon Islands (1 case) during the incubation period. One case reported overseas travel to more than one country.

Cholera: One case of cholera was notified in February 2016. The case was a male in the 20–29 years age group from Waitemata DHB. After further investigation, the case has since been found not to meet the case criteria.

Hepatitis A: Three cases of hepatitis A (2 confirmed and 1 under investigation) were notified in February compared to two cases notified during the previous month and nine cases notified during the same month of the previous year. After further investigation, one case has since been found not to meet the case criteria. The cases were reported from Auckland and Waitemata DHBs, and both were lab confirmed. Cases were in the 20–29 years and 70+ years age groups, and were in the Asian and European or Other ethnic groups, respectively. Overseas travel information was recorded for both cases, of which one case had travelled to India during the incubation period for the disease.

Hepatitis NOS: One case of hepatitis NOS (hepatitis delta) was notified in February 2016. The case was a female in the 50–59 years age group from Waitemata DHB, and was also a hepatitis B carrier. After further investigation, the case has since been found not to meet the case criteria.

Legionellosis: 17 cases of legionellosis (13 confirmed, 2 probable and 2 under investigation) were notified in February compared to 40 cases notified during the previous month, and 15 during the same month of the previous year. Cases were reported from Auckland (3 cases), Counties Manukau, Waitemata, Hawke’s Bay, Waikato (2 cases each), Northland, Bay of Plenty, MidCentral, Hutt Valley, Nelson Marlborough and Canterbury (1 case each) DHBs. The Legionella species was identified for 15 cases as: L. longbeachae (13 cases) and L. pneumophila (2 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.

Measles: Nine cases of measles (5 confirmed and 4 under investigation) were notified in February compared to zero cases notified during the same month of the previous year. After further investigation, four cases have since been found not to meet the case criteria. Cases were reported in the 20–29 years (3 cases), <1 year and 30–39 years (1 case each) age groups. All cases were from the North Island: Counties Manukau (3 cases), Auckland and Waitemata (1 case each) DHBs. One interim measles outbreak was created in February (case numbers yet to be determined). The outbreak source was recorded as imported, from a case that had travelled to India and the People’s Republic of China during the incubation period for the disease. Of the cases for which risk factor information was recorded, 80.0% (4/5) of cases were part of the outbreak. The one case that was not associated with the outbreak had overseas travel during the incubation period recorded, the case had been to India.

Meningococcal disease: One probable case of meningococcal disease was notified in February 2016 compared to two cases notified during the same month of the previous year (Figure 1). The 12-month rate in February (1.4 cases per 100,000) was slightly higher than at the same time in the previous year (1.1 per 100,000). The case was aged 15 months and was in the Asian ethnic group. The case was reported from Southern DHB and was hospitalised.

Rheumatic fever: Nine cases of rheumatic fever (8 initial attack and 1 recurrent attack) were notified in February, compared to 12 cases during the same month of the previous year. All cases except one were from the North Island: Auckland (3 cases), Waitemata (2 cases), Counties Manukau, Bay of Plenty, Lakes and Canterbury (1 case each) DHBs. Cases ranged in age from 7 to 39 years, and were reported in the 10–14 years (6 cases), 5–9 years, 15–19 years and 30–39 years (1 case each) age groups. Cases were reported in the Pacific Peoples (7 cases) and Māori (2 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. 

Rubella: One confirmed case of rubella was notified in February compared to zero cases during the same month of the previous year. Prior to this case no cases of rubella have been notified in New Zealand since July 2014. The case was in the 20–29 years age group and was in the European or Other ethnic group. The case was reported from Waitemata DHB and was hospitalised. Overseas travel information was recorded, and the case had travelled to India and Thailand during the incubation period for the disease. The case was reported as being imported from India.

Shigellosis: 15 confirmed cases of shigellosis were notified in February compared with nine cases notified during the same month of the previous year (Figure 2). The 12-month rate in February (2.4 cases per 100,000) was slightly lower than at the same time in the previous year (3.1 per 100,000). The highest numbers of cases were reported from Auckland, Waitemata and Waikato DHBs (3 cases each). The serotype involved was recorded for 86.7% (13/15) of cases: Shigella sonnei biotype g (5 cases), S. sonnei biotype a (3 cases), S. boydii 13 (2 cases), S. flexneri 2a, S. flexneri 2b and S. flexneri 6 biotype Manchester (1 case each). Information on overseas travel during the incubation period was recorded for 73.3% (11/15) of cases, of which six cases recorded overseas travel. Countries visited included: Indonesia (2 cases), Australia, Germany, India, Papua New Guinea, Singapore and the Solomon Islands (1 case each). Two cases reported overseas travel to more than one country.

Tuberculosis disease: 30 cases of tuberculosis disease (27 new cases and 3 relapse or reactivation) were notified in February compared to 22 cases notified during the same month of the previous year. The highest number of cases was reported from the Auckland region (12 cases). The cases ranged in age from 21 to 85 years, with the highest numbers of cases reported in the 30–39 years (11 cases) and 20–29 years (7 cases) age groups. Of the cases for which risk factor information was recorded, 77.8% (21/27) of cases were born outside of New Zealand. Twenty-four cases were laboratory confirmed, and of these the mycobacterial species was recorded for 18 cases as M. tuberculosis. One death due to tuberculosis disease (new case) was reported in February (Table 3).

VTEC/STEC infection:86 cases of VTEC/STEC infection (74 confirmed and 12 under investigation) were notified in February compared to 22 cases notified during the same month of the previous year. After further investigation, two cases have since been found not to meet the case criteria. The highest numbers of cases were reported from Waitemata (27 cases), Auckland (17 cases) and Counties Manukau (14 cases) DHBs. The highest numbers of cases occurred in the 1–4 years (20 cases), 20–29 years (12 cases) and 40–49 years (11 cases) age groups. Eleven cases were hospitalised. Seventy-three 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 (30 cases) and non-O157 (43 cases). Of the non-O157 cases, 97.7% (42/43) of cases did not have a serotype determined but verocytotoxin was detected by PCR. Among the cases for which risk factor information was recorded, 56.5% (13/23) had contact with animals, 52.4% (11/21) had recreational contact with water, 20.9% (9/43) had contact with a person with similar symptoms, and 20.0% (4/20) had contact with children in nappies. 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. Two interim VTEC/STEC outbreaks were created in February (case numbers yet to be determined).

Zika virus infection: 65 cases of zika virus infection (60 confirmed, 2 probable and 3 under investigation) were notified in February 2016. After further investigation, two cases have since been found not to meet the case criteria. The highest numbers of cases were reported in the 30–39 years (18 cases), 20–29 years (14 cases) and 50–59 years (11 cases) age groups. Laboratory testing information was recorded for all cases, of which 95.2% (60/63) of cases were confirmed by PCR. Overseas travel information was recorded for all cases, of which 98.4% (62/63) of cases travelled during the incubation period for the disease. Countries visited included Tonga (48 cases), Samoa (14 cases) and American Samoa (1 case). One case reported travel to more than one country. 

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Report:

Monthly Notifiable Disease Surveillance Report - February 2016

Tables:

Monthly National Totals - February 2016

Monthly DHB Totals - February 2016

Monthly Rolling Totals - February 2016

 

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Monthly Notifiable Disease Surveillance Report - February 2016

Tables:

Monthly National Totals - February 2016

Monthly DHB Totals - February 2016

Monthly Rolling Totals - February 2016

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