Monthly Notifiable Disease Surveillance Report - Apr 2015

Saturday 21st September 2019


Key notifiable disease trends

Chikungunya fever: Four cases (3 confirmed and 1 under investigation) were notified in April 2015 compared to one probable case notified during the same month of the previous year. All cases reported overseas travel during the incubation period, to the Cook Islands (3 cases) and Samoa (1 case).

Cryptosporidiosis: 34 cases of cryptosporidiosis were notified in April 2015 compared to 18 cases notified during the same month of the previous year (Figure 1). The highest numbers of cases were reported from Counties Manukau (5 cases), Bay of Plenty, Waikato and Southern (4 cases each) DHBs. The cases ranged in age from 9 months to 61 years, with the highest numbers of cases in the 1–4 years and 30–39 years age groups (9 cases each). Among the cases for which risk factor information was recorded, 53.3% (8/15) had contact with faecal matter or vomit, 42.1% (8/19) had contact with farm animals, and 41.2% (7/17) had contact with other symptomatic people during the incubation period.

Invasive pneumococcal disease: 25 cases of invasive pneumococcal disease were notified in April 2015 compared to 38 cases notified during the same month of the previous year. The highest numbers of cases were reported from Counties Manukau (6 cases), Southern (4 cases), and Waikato (3 cases) DHBs. The cases ranged in age from 3 months to 93 years, with the highest numbers of cases in the 70+ years (11 cases), 60–69 years (6 cases) and 40–49 years (5 cases) age groups. Twenty-two cases were hospitalised and no deaths were reported. Among the cases for which risk factor information was recorded, 64.7% (11/17) had a chronic illness, 33.3% (6/18) had chronic lung disease, 31.3% (5/16) were smokers, and 16.7% (3/18) were immunocompromised.

Legionellosis: 23 cases (12 confirmed, 7 probable, and 4 under investigation) were notified in April 2015 compared to 11 cases notified during the previous month, and seven during the same month of the previous year. The highest number of cases was reported from Canterbury DHB (8 cases). The Legionella species was identified for 11 cases as: L. pneumophila (8 cases),and L. longbeachae (3 cases). 

Paratyphoid fever: Five cases of paratyphoid fever were notified in April 2015 compared to two cases during the same month of the previous year. The highest number of cases was from Waikato DHB (3 cases). The cases ranged in age from 15 to 46 years, and all were hospitalised. The Salmonella serotype was identified for all cases: S. Paratyphi A (4 cases) and S. Paratyphi B (1 case). Three cases reported overseas travel during the incubation period. Countries visited were Australia, India, and Thailand.

Rheumatic fever: Based on the earliest date available, six cases of rheumatic fever (all initial attack) were notified in April 2015, compared to 11 cases during the same month of the previous year (Figure 2). All cases were from the North Island, Counties Manukau and Northland (2 cases each) and Waikato and Waitemata (1 case each) DHBs. Cases ranged in age from 6 to 28 years, with the majority aged 10 years or under. Cases were reported in Māori (3 cases) and Pacific Peoples (3 cases) ethnic groups. Hospitalisation status was recorded for 5 cases, all of which were hospitalised.

Ross River virus infection: Two confirmed cases were notified in April 2015. Both cases were in Australia during the incubation period.

Salmonellosis: 97 cases of salmonellosis were notified in April 2015 compared to 50 cases notified during the same month of the previous year. The highest numbers of cases were reported from Auckland (13 cases), Waitemata (12 cases) and Canterbury (11 cases) DHBs. The cases ranged in age from 5 months to 82 years, with the highest numbers of cases in the 50–59 years (17 cases), 1–4 years (15 cases), 40-49 years and 60-69 years (14 cases each) age groups. Eleven cases were hospitalised. The Salmonella serotype was identified in 65 (67.0%) of the cases. The most common serotypes were S. Enteritidis phage type 11 (11 cases), S. Infantis (9 cases), and S. Typhimurium phage type 101 (7 cases). Among the cases for which risk factor information was recorded, 47.6% (20/42) had consumed food from a food premises, 31.7% (13/41) had contact with farm animals, and 25.4% (17/67) had travelled overseas. No Salmonella outbreaks were reported in April.

Shigellosis: Eight cases of shigellosis were notified in April 2015 compared to four cases in the same month of the previous year. The highest number of cases was reported from Counties Manukau DHB (3 cases). Four cases (50.0%) had overseas travel information recorded. Of these cases three cases had not travelled overseas during the incubation period. The serotype was recorded for 7 (87.5%) cases: S. sonnei biotype a (3 cases), S. sonnei biotype g (2 cases), S. sonnei no biotype specified (1 case), and S. flexneri 2b (1 case).

Yersiniosis: 35 cases of yersiniosis were notified in April 2015 compared to 27 cases notified during the same month of the previous year. The highest numbers of cases were reported from Canterbury (10 cases), Waitemata (5 cases), and Auckland (4 cases) DHBs. The cases ranged in age from 7 months to 95 years, with the highest numbers of cases in the 50–59 years and 70+ years (6 cases each) age groups. One case was hospitalised. The Yersinia species involved was identified for 30 (85.7%) cases, and all were Y. enterocolitica. The most common biotype reported was biotype 1A (10 cases), followed by biotypes 2 and 4 (6 cases each). Among the cases for which risk factor information was recorded, 50.0% (5/10) had consumed food from a food premises, 30.0% (3/10) had contact with faecal matter or vomit, and 22.2% (2/9) had recreational contact with water during the incubation period. 

Zika virus: Two cases (1 confirmed and 1 probable) were notified in April 2015. Both cases were overseas during the incubation period, one in the Cook Islands and one in Vanuatu.

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Report:

Monthly Notifiable Disease Surveillance Report - Apr 2015

Tables:

Monthly National Totals - Apr 2015

Monthly DHB Totals - Apr 2015

Monthly Rolling Totals - Apr 2015

 

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Monthly Notifiable Disease Surveillance Report - Apr 2015

Tables:

Monthly National Totals - Apr 2015

Monthly DHB Totals - Apr 2015

Monthly Rolling Totals - Apr 2015

Ph: +64 4 914 0700 Fax: +64 4 914 0770 Email: survqueries@esr.cri.nz