Monthly Notifiable Disease Surveillance Report - Dec 2015

Friday 20th September 2019


Key notifiable disease trends

Campylobacteriosis: 757 cases of campylobacteriosis (753 confirmed and 4 under investigation) were notified in December 2015 compared to 893 cases notified during the same month of the previous year. For the 12 month period ending 31 December 2015, the highest rates were in West Coast (243.9 per 100,000 population, 9 cases), South Canterbury (216.9 per 100,000 population, 15 cases), and Taranaki (195.7 per 100,000 population, 30 cases) DHBs compared to a national rate of 138.1 per 100,000. One finalised Campylobacter outbreak (2 cases) and one interim outbreak (case numbers yet to be determined) were created in December.

Cronobacter species: One confirmed Cronobacter species was notified in December 2015. The case was a female in the 70+ years age group from Counties Manukau DHB.

Cryptosporidiosis:32 cases of cryptosporidiosis (31 confirmed and 1 under investigation) were notified in December 2015 compared to 24 cases notified during the same month of the previous year (Figure 1). The highest numbers of cases were reported from Auckland (6 cases), and Counties Manukau and Waitemata (4 cases each) DHBs. The cases ranged in age from 13 months to 65 years, with the highest numbers of cases in the 1–4 years (11 cases), 30–39 years (6 cases) and 5–9 years (5 cases) age groups. Among the cases for which risk factor information was recorded, 54.5% (6/11) had contact with faecal matter or vomit, 50.0% (5/10) had recreational water contact, 33.3% (4/12) had consumed food from a food premises, 33.3% (5/15) had contact with other symptomatic people, 28.6% (4/14) had contact with farm animals, and 22.2% (2/9) had consumed untreated water during the incubation period. Two finalised Cryptosporidium outbreaks (5 cases total) were created in December.

Hepatitis A: Four cases of hepatitis A (3 confirmed and 1 under investigation) were notified in December 2015 compared to five cases notified during the previous month and one case notified during the same month of the previous year. All confirmed cases were lab confirmed. Ethnicity was recorded for all cases, and were reported in the Asian, European or Other, Māori, and Pacific peoples ethnic groups (1 case each). Cases were reported from Counties Manukau, Bay of Plenty, Canterbury and Southern DHBs (1 case each). The cases ranged in age from 29–47 years, with the highest number of cases in the 40–49 years age group (3 cases). Two confirmed cases were linked to the Hepatitis A outbreak from November 2015, which was associated with frozen berries. The other confirmed case had overseas travel during the incubation period recorded, the case had been to India.

Invasive pneumococcal disease: 34 cases of invasive pneumococcal disease (31 confirmed and 3 under investigation) were notified in December 2015 compared to 43 cases notified during the same month of the previous year. The highest numbers of cases were reported from Counties Manukau and Waikato DHBs (6 cases each). The age range for cases was 6 months–94 years, with the highest numbers reported in the 70+ years (13 cases), 60–69 years (8 cases) and 50–59 years (5 cases) age groups. Twenty-two cases were hospitalised and two deaths (Table 3) from invasive pneumococcal disease were reported. Of the cases for which risk factor information was recorded, 47.6% (10/21) had a chronic illness, 23.8% (5/21) were smokers, and 14.3% (3/21) were immunocompromised.

Legionellosis: 49 cases of legionellosis (27 confirmed, 11 probable and 11 under investigation) were notified in December 2015 compared to 53 cases notified during the previous month, and 20 during the same month of the previous year. The highest numbers of cases were reported from MidCentral (8 cases), Waikato (7 cases) and Counties Manukau (6 cases) DHBs. The Legionella species was identified for 29 cases as: L. longbeachae (23 cases) and L. pneumophila (6 cases). The increase in legionellosis notifications for the year (258 compared with 123 cases at the same time in 2014) may be due to the LegiNZ study, which began in May 2015 and involves 20 hospitals in 17 DHBs. 

Measles: One confirmed case of measles was notified in December 2015 compared to no cases notified during the same month of the previous year. Overseas travel during the incubation period was recorded, the case had been to Australia. Ten confirmed cases have been notified in the year to date compared to 280 at the same time in the previous year.

Meningococcal disease: Six cases of meningococcal disease were notified in December 2015 compared to two 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. Cases were reported from Capital and Coast (2 cases), and Northland, Auckland and Waitemata (1 case each) DHBs. Cases were reported in the 1–4 years (2 cases), and 5–9 years, 20–29 years and 70+ years (1 case each) age groups. Four cases were hospitalised. Four cases were laboratory confirmed and the strain type was determined for all cases: group B (2 cases, including 1 group B:P1.7-2,4), group C (1 case), and group W135 (1 case). 

Rheumatic fever: Six cases of initial attack rheumatic fever (5 confirmed and 1 probable) were notified in December 2015, compared to 11 cases during the same month of the previous year. All cases were from the North Island; Counties Manukau and Waitemata (2 cases each), and Hawke’s Bay and Bay of Plenty (1 case each) DHBs. Cases ranged in age from 5 to 20 years, and were reported in the 10–14 years (4 cases), and 5–9 years and 20–29 years (1 case each) age groups. Cases were reported in the Pacific peoples and Māori ethnic groups (3 cases each). Hospitalisation status was recorded for all cases, of which 83.3% (5/6) 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. 

Taeniasis: One confirmed case of taeniasis was notified in December 2015. The case was a female in the 30–39 years age group from Capital and Coast DHB. Overseas travel during the incubation period was recorded, the case had been to Ethiopia.

Typhoid fever: Ten cases of typhoid fever were notified in December 2015 compared to four cases notified during the same month of the previous year. After further investigation three cases have since been found not to meet the case criteria. Cases were reported from Auckland (3 cases), Counties Manukau (2 cases), and Nelson Marlborough and Southern (1 case each) DHBs. The cases were in the 20–29 years (2 cases) and 1–4 years, 5–9 years, 10–14 years, 30–39 years, 50–59 years (1 case each) age groups. Of the cases for which hospitalisation information was recorded, 100.0% (3/3) were hospitalised. Five cases reported travelling during the incubation period, and the countries visited were India (4/5) and Pakistan (1/5). Of the two cases that did not report overseas travel, one was part of an outbreak and the other had consumed raw fish and shellfish.

VTEC/STEC infection:42 cases of VTEC/STEC infection (37 confirmed and 5 under investigation) were notified in December 2015 compared to 11 cases notified during the same month of the previous year (Figure 2). After further investigation one case has since been found not to meet the case criteria. The highest numbers of cases were reported from Counties Manukau (13 cases), Waitemata (11 cases) and Northland (7 cases) DHBs. The highest numbers of cases occurred in the 1–4 years (11 cases), 60–69 years (8 cases), and 15–19 years, 20–29 years, and 70+ years (5 cases each) age groups. Three cases were hospitalised. Thirty-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 (6 cases) and non-O157 (27 cases). Among the cases for which risk factor information was recorded, 70.0% (7/10) had contact with animals, 50.0% (5/10) had contact with children in nappies, and 10.0% (1/10) had contact with a person with similar symptoms. 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 finalised VTEC/STEC outbreaks (4 cases total) and one interim outbreak (case numbers yet to be determined) were created in December.

Zika virus: One confirmed case was notified in December 2015. The case was a male in the 30–39 years age group from Waitemata DHB, who reported overseas travel to Samoa during the incubation period.

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Report:

Monthly Notifiable Disease Surveillance Report - December 2015

Tables:

Monthly National Totals - December 2015

Monthly DHB Totals - December 2015

Monthly Rolling Totals - December 2015

 

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Monthly Notifiable Disease Surveillance Report - December 2015

Tables:

Monthly National Totals - December 2015

Monthly DHB Totals - December 2015

Monthly Rolling Totals - December 2015

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