Monthly Surveillance Report - Sep 2005
Tuesday 21st March 2023
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Key Notifiable Disease Trends
- Barmah Forest virus infection: two confirmed cases of Barmah Forest virus infection were notified during September. Both cases had been to Australia.
- Campylobacter: 1374 campylobacter cases were notified in September 2005 compared to 916 cases notified in the same month last year. Canterbury DHB recorded the highest number of cases (253). Among the cases for whom this information was recorded 56.1% (124/221) had consumed food from a food premise, 11.6% (25/216) had consumed untreated water, 8.9% (20/225) had faecal contact, 8.2% (18/219) had recreational water contact, 6.9% (14/204) had contact with sick animals, and 4.6% (16/348) had contact with another case during the incubation period. South Canterbury DHB recorded the highest current incidence rate of 727.5 per 100 000 population compared to the national rate of 341.6 per 100 000 population. Hospitalisation data was recorded for 648 cases of whom 53 (8.2%) were hospitalised. Two final outbreaks were reported from Wellington and the West Coast involving six and three cases respectively. Two interim outbreaks were reported from the Auckland region involving two cases thus far.
- Hydatid disease: a case of laboratory confirmed hydatid disease was notified during September. The case was an adult male who had occupational exposure to the disease reservoir.
- Influenza: during September (weeks 35 – 39), 207 consultations for influenza-like illness were reported from 75 general practices (on average) in 20 out of 24 health districts. The average weekly consultation rate for September was 14.5 per 100 000 patient population, compared to a rate of 95.8 per 100 000 patient population during the same month last year (Figure 1). Otago had the highest consultation rate (83.5 per 100 000), followed by Eastern Bay of Plenty (48.8 per 100 000). A total of 67 swabs were received for testing during September. Of these, six influenza viruses were identified, four as A/New Caledonia/20/1999-like and two as B/Hong Kong/330/2001-like. In addition, nine influenza viruses were reported from the laboratory-based (non-sentinel) surveillance in September. Of these, four were identified as A/New Caledonia/20/1999-like, three as A/California/7/2004-like, and two as influenza A (yet to be sub-typed).
- Meningococcal disease: based on earliest date available , 16 cases of meningococcal disease were notified during September 2005, of which 10 (62.5%) were laboratory-confirmed. In comparison, 14 cases were notified the previous month, and 54 cases were notified during September 2004. For the previous 12 months, West Coast DHB recorded the highest current rate of 19.8 per 100 000 population (6 cases). Counties Manukau DHB recorded the highest number of cases (37) with a current rate of 9.9 per 100 000 population. The rate of disease was highest amongst infants aged less than one year (51.2 per 100 000 population, 28 cases), followed by those in the 1-4 years age group (28.2 per 100 000 population, 61 cases).
- Pertussis: 227 pertussis cases were notified in September 2005, of whom 45 (19.8%) were laboratory confirmed. Pertussis numbers have decreased from the peak in November 2004 with 613 cases (Figure 2). Canterbury DHB had the highest number of cases (91). For the previous 12 months, Southland DHB had the highest incidence rate of 515.8 per 100 000 population (533 cases), compared to a national rate of 101.7 per 100 000 population. Hospitalisation data was recorded for 172 cases of whom 6 (3.5%) were hospitalised. The rate by age group for the previous 12 months was highest amongst infants aged less than one year (305.6 per 100 000 population). This was followed by children in the 5-9 years age group (195.7) and the 10-14 years age group (189.9).
- Salmonellosis: 134 salmonellosis cases were notified in September 2005, compared with 71 cases at the same time last year. Southland DHB had the highest number of cases (17). For the previous 12 months, Southland DHB had the highest incidence rate of 70.6 per 100 000 population, compared to a national rate of 34.4 per 100 000 population. Hospitalisation data was recorded for 64 cases of whom 11 (17.2%) were hospitalised. The ESR Enteric Reference Laboratory received 143 isolates in September. The predominant types identified were Salmonella Typhimurium phage type 160 (38 isolates), S. Brandenburg (23 isolates), and S. Typhimurium phage type 135 (13 isolates). One uncommon Salmonella serotype was isolated, S. subspecies IIIb associated with travel to Malaysia and Philippines. Two final outbreaks were reported from Tauranga and the Auckland region involving eight and three cases respectively. Two interim outbreaks were reported from the Auckland region involving two cases thus far.
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Ph: +64 4 914 0700 Fax: +64 4 914 0770 Email: survqueries@esr.cri.nz |
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