Monthly Notifiable Disease Surveillance Report - Jan 2015

Tuesday 17th September 2019


Key notifiable disease trends

Chikungunya fever: 21 cases of chikungunya fever (13 confirmed, 2 probable and 6 under investigation) were notified in January 2015. All cases reported overseas travel during the incubation period to Samoa (18 cases), Fiji, French Polynesia, India, and Tokelau (1 case each). One case reported travel to more than one country.

Cholera: One case of cholera was notified in January 2015. After further investigation, the case has since been found not to meet the case criteria.

Dengue fever: 32 cases of dengue fever (26 confirmed, 1 probable, and 5 under investigation) were notified in January 2015 compared to 22 cases notified in the same month of the previous year. After further investigation, one case has since been found not to meet the case criteria. The travel history was recorded for 96.8% (30/31) of cases. The countries most commonly visited were Tonga (15 cases) and Indonesia (5 cases). Some cases reported travel to more than one country.

Hydatid disease: One case of hydatid disease was notified in January 2015. The case was a male in the 60–69 years age group from the Tairawhiti DHB, with onset date in the 1960’s.

Invasive pneumococcal disease: 18 cases were notified in January 2015 compared to 26 cases notified during the previous month. The highest number of cases was reported from Waitemata DHB (3 cases). The age range for cases was 5 months–91 years, with the highest numbers reported in the 60–69 years and 70+ years (5 cases each) age groups. Fifteen cases were hospitalised and one death (Table 3) from invasive pneumococcal disease was reported. Of the cases for which risk factor information was recorded, 46.7% (7/15) had a chronic illness, 13.3% (2/15) were immunocompromised, and 9.1% (1/11) was a smoker.

Leprosy: One probable leprosy case was notified in January 2015. The case was a male in the 5–9 years age group from the Hutt Valley DHB.

Leptospirosis: Seven cases of leptospirosis were notified in January 2015 (6 confirmed and 1 under investigation). This compared to two cases notified during the same month of the previous year. The cases were reported from Taranaki, Whanganui, Wairarapa, Nelson Marlborough, West Coast, Canterbury, and Southern (1 case each) DHBs. Five cases reported a high-risk occupation as famers or farm workers. The two cases that did not record a high-risk occupation had animal contact. Leptospira species were recorded for two cases: Leptospira Ballum and L. Tarassovi (1 case each).

Meningococcal disease: Five meningococcal disease cases were notified in January 2015 compared to two cases notified in the same month of the previous year. The cases were reported from Northland, Auckland, Counties Manukau, Waikato, and Southern (1 case each) DHBs. All cases were laboratory confirmed and the stain type was determined as group B (3 cases, none were the B:P1.7-2,4) and group C (2 cases, C:P1.5-1,10-8).

Salmonellosis: 142 cases of salmonellosis were notified in January 2015 compared to 104 cases notified during the same month of the previous year (Figure 1). After further investigation, one case has since been reclassified as paratyphoid fever. The highest numbers of cases were reported from Auckland (23 cases), Northland and Waitemata (19 cases each) DHBs. The cases ranged in age from 3 months to 86 years, with the highest numbers of cases in the 30–39 years (24 cases) and 40–49 years (22 cases) age groups. Twenty-one cases were hospitalised. The Salmonella serotype was identified in 132 (93.6%) of the cases. The most common were S. Thompson (24 cases), S. Typhimurium phage type 56 variant (8 cases), S. Enteritidis phage type 11 and S. Infantis (7 cases each). The increase in S. Thompson cases was due to an outbreak associated with a food premises in Northland. Among the cases for which risk factor information was recorded 52.0% (26/50) had consumed food from a food premises, 36.4% (32/88) had travelled overseas, and 28.3% (15/53) had recreational water contact. Five Salmonella outbreaks were reported in January including four finalised outbreak (8 cases) and one interim outbreak (case numbers not yet established).

Shigellosis: 24 cases of shigellosis were notified in January 2015 compared with seven cases notified during the same month of the previous year (Figure 2). The highest numbers of cases were reported from Capital and Coast (6 cases) and Auckland (5 cases) DHBs. The serotype involved was recorded for all cases: Shigella sonnei biotype g (10 cases), S. flexneri 2b, S. flexneri 3a, S. sonnei biotype a (3 cases each), and S. flexneri 2a (2 cases), S. boydii 13, and S. flexneri 3b, and S. flexneri y variant (1 case each). Information on overseas travel during the incubation period was recorded for 54.2% (13/24) of cases, of which five cases did not travel. Countries visited included India (3 cases), Vanuatu (2 cases), Australia, Indonesia and Viet Nam (1 case each). Three Shigella outbreaks were reported in January including one finalised outbreak (2 cases) and two interim outbreaks (case numbers not yet established).

VTEC/STEC infection: 20 cases of VTEC/STEC infection (15 confirmed and 5 under investigation) were notified in January 2015 compared to 10 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 highest numbers of cases were reported from Waitemata, Auckland, and Nelson Marlborough (3 cases each) DHBs. Six cases were hospitalised of which one had haemolytic uraemic syndrome. The highest number of cases occurred in the 10–14 years age group (4 cases). The serotype/organism was identified by the Enteric Reference Laboratory for 16 cases of which 56.3% (9/16) were Escherichia coli O157:H7. Among the cases for which risk factor information was recorded, 80.0% (4/5) had contact with farm animals, 50.0% (2/4) had consumed water from a non-habitual water supply, and 44.4% (4/9) had contact with recreational water.

 

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Report:

Monthly Notifiable Disease Surveillance Report - Jan 2015

Tables:

Monthly National Totals - Jan 2015

Monthly DHB Totals - Jan 2015

Monthly Rolling Totals - Jan 2015

 

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Monthly Notifiable Disease Surveillance Report - Jan 2015

Tables:

Monthly National Totals - Jan 2015

Monthly DHB Totals - Jan 2015

Monthly Rolling Totals - Jan 2015

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