Monthly Notifiable Disease Surveillance Report - Nov 2010

Monday 23rd September 2019


Key nofiable disease trends

  • Dengue fever: Four cases of dengue fever were reported in November 2010 compared to five cases notified in the same month of the previous year. All of the four cases had travelled overseas during the incubation period.  The countries visited were: Haiti, India, Thailand, and Viet Nam. One of the cases was hospitalised. All cases reported taking some precautions against biting insects while overseas.  Two cases had an onset date within the month of November while the the other two cases had an onset date within the month of July or August. One case was linked to an overseas outbreak (Viet Nam).
  • Giardiasis: 153 cases of giardiasis were notified in November 2010 compared to 147 cases notified in the same month of the previous year. The highest numbers of cases were reported in Auckland (33 cases), Waitemata (25 cases), and Canterbury (24 cases). The age groups with the highest numbers of cases were; 1-4 years (29 cases), 40-49 years (28 cases) and 30-39 years (27 cases).Among the cases where risk information was recorded, 52.4% (11/21) had consumed untreated water, 37.5% (9/24) had contact with other symptomatic people, 37.5% (6/16) had contact with farm animals, and 31.6% (6/19) had contact with faecal matter. Seven Giardia outbreaks (4 completed, 3 interim) involving 33 cases were reported in November.
  • Hepatitis B: Ten cases of hepatitis B were notified in November 2010 (4 confirmed, 6 under investigation) compared to five cases notified in the same month of the previous year.  Three were reported as laboratory confirmed. Ethnicity was reported for five cases: European (2 cases), Maori (2 cases), and Pacific Peoples (1 case). Of the four confirmed cases, one case reported household and sexual contact with a confirmed case or carrier, one case reported having undergone a tattooing procedure in the last 12 months, and the remaining two cases had unknown or no obvious risk factors related to hepatitis B.
  • Hepatitis C: Seven cases of hepatitis C were notified in November 2010 (3 confirmed, 1 probable, 3 under investigation) compared to two cases notified in the same month of the previous year. The following information is based on confirmed and probable cases. Two cases were reported as laboratory confirmed. Ethnicity was reported as European (2 cases), Maori (1 case) and is unknown for remaining case. One case reported history of injecting drug use and risk factor information was unavailable for the remaining three cases.
  • Legionellosis: 33 cases of legionellosis were notified in November 2010 (11 confirmed, 4 probable and 18 under investigation) compared to nine in the same month of the previous year. The following section is based on confirmed and probable cases. Eight cases were from CanterburyDHB, and the following DHBs had one case each: Northland, Auckland, Waikato, Bay of Plenty, Lakes, Hutt Valley, and Nelson Marlborough. Five cases occurred in the 60-69 years age group, four in the 70+ and over age group, and two in the 30-39 years, 40-49 years, and 50-59 years age groups. Eleven (73, 3%) cases were hospitalised.  The Legionella species were identified in six cases: Legionella longbeachae serogroup 1 (3 cases), L. bozemanae serogroup 1, L. jordanis, L. pneumophila and L. pneumophila serogroup 1 (1 case each).
  • Meningococcal disease: Based on the earliest date available1, nine cases of meningococcal disease were notified during November 2010, eight (88.9%) of which were laboratory-confirmed.  In comparison, six cases (all laboratory-confirmed) were notified in the previous month and five (three laboratory-confirmed) during the same month last year. For the 12-month period ending 30 November 2010, the highest incidence rate was reported in Hutt Valley DHB (5.6 per 100 000 population, 8 cases), followed by Southland (5.4 per 100 000, 6 cases), Hawke’s Bay (4.5 per 100 000, 7 cases) and Northland (4.5 per 100 000, 7 cases) DHBs.  The highest age-specific rate was in infants aged less than one year (41.2 per 100 000 population, 26 cases), followed by those in the 1-4 years age group (10.3 per 100 000, 25 cases).
  • Pertussis: 70 cases of pertussis were notified in November 2010 (31 confirmed, 30 probable 2 suspected and 7 still under investigation) compared to 146 and 55 cases in the same month of previous years 2009 and 2008, respectively. The number of pertussis cases continues to decrease since last year. The highest numbers were reported from Auckland (15 cases), Canterbury and Waikato (9 cases each), Capital and Coast (6 cases), and Hawke’s Bay (5 cases) DHBs. Cases involved all age groups, with highest numbers in 5-9 years (14 cases), 40-49 years (10 cases), 10-14 years (8 cases), and in less than one year (7 cases, including 1 case aged less than 6 weeks) age groups. Of the 61 cases with hospitalisation information, eight were hospitalised. No deaths were reported in November.
  • Rheumatic fever: 18 cases of rheumatic fever (16 initial attack and 2 recurrent attack) were notified in November 2010 compared to five cases notified in the same month of the previous year.  The following information is for initial attack only. Eleven (68.8%) cases were aged less than 15 years. Ethnicity was recorded for all cases: Maori (9 cases), Pacific Peoples (5 cases) and European (2 cases). The Jones criteria was recorded in nine cases, of which eight (88.9%) had a laboratory-confirmed diagnosis for streptococcal infection. The onset date was recorded for 13/18 (72.2%) cases.  Of these 13, only three cases had an onset date within the month of November.  The remaining 10 cases had an onset date within the month of August (2 cases), September (3 cases), and October (5 cases).
  • Salmonellosis: 100 cases of salmonellosis were notified in November 2010 compared to 111 notified in the previous month and 75 cases the same month of previous year. There were 92 (92%) laboratory-confirmed cases. As in the previous month, Otago DHB reported the highest number of cases (25 cases), followed by Waitemata (9 cases), Canterbury (8 cases), Waikato (8 cases), Nelson Marlborough (7 cases) and Southland (7 cases) DHBs. Salmonellosis occurred in all age groups, with the highest numbers of cases in the 1-4 years (22 cases), 40-49 years (18 cases), 20-29 years (12 cases) age groups. Of the 51 cases with hospitalisation information, nine were hospitalised. The serotype involved was identified in 60 of the cases, and most prevalent serotypes were Salmonella Typhimurium phage type 160 (9 cases), S. Typhimurium phage type 135 (8 cases), S. Typhimurium phage type RDNC-May 06 (8 cases), S. Typhimurium phage type 9 (6 cases), and S. Brandenburg (4 cases). Other serotypes such as S. Montevideo, S. Newport, S. Pensacola, S. Thompson and S. Weltevreden, were indentified among cases with overseas travel history. 
  • VTEC/STEC infection: 12 cases of VTEC/STEC infection were notified in November 2010, compared to 11 cases notified in the preceding month and 6 cases in the same month of the previous year (Figure 1). The cases were aged from 1 year old to 70+ years, with the highest number of cases in children under 5 years (5 cases). One case was hospitalised. Escherichia coli O157:H7 was isolated in five cases and E. coli O176:HNM in one case. No significant risk factor information was recorded.
  • Yersiniosis: 51 yersiniosis cases were notified in November 2010, compared to 44 cases notified in the preceding month and 32 cases the same month of the previous year (Figure 2). Four cases were hospitalised. Waikato DHB had the highest numbers of cases (9 cases) followed by Waitemata (8 cases) and Canterbury (6 cases) DHBs. Eight cases occurred in the 40-49 years age group  and seven in the 1-4 years and 50-59 years age groups. The biotype involved was identified in 26 of the cases, and the dominant biotypes were Yersinia enterocolitica Biotype 2 (14 cases), Y. enterocolitica Biotype 1A (6 cases), and Y. enterocolitica Biotype 4 (5 cases).

1 The ‘earliest’ date refers to the earliest recorded date for the case (onset or hospitalisation date rather than report date, if available). ‘Earliest’ date, as opposed to ‘report date’ alone, is used throughout the analysis of meningococcal disease notification data.   

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Report:

Monthly Notifiable Disease Surveillance Report - Nov 2010

Tables:

Monthly National Totals - Nov 2010

Monthly DHB Totals - Nov 2010

Monthly Rolling Totals - Nov 2010

 

DOWNLOADS

Monthly Notifiable Disease Surveillance Report - Nov 2010

Tables:

Monthly National Totals - Nov 2010

Monthly DHB Totals - Nov 2010

Monthly Rolling Totals - Nov 2010

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