Monthly Notifiable Disease Surveillance Report - Aug 2015

Tuesday 17th September 2019


Key notifiable disease trends

Campylobacteriosis: 490 cases of campylobacteriosis (489 confirmed and 1 under investigation) were notified in August 2015 compared to 506 cases notified during the same month of the previous year (Figure 1). For the 12 month period ending 31 August 2015, the highest rates were in West Coast (216.5 per 100,000 population, 71 cases), South Canterbury (192.8 per 100,000 population, 112 cases), and Taranaki (184.3 per 100,000 population, 212 cases) DHBs compared to a national rate of 142.7 per 100,000. One finalised Campylobacter outbreak was reported in August (4 cases).

Chikungunya fever: One confirmed case was notified in August 2015 compared to one probable case notified during the same month of the previous year. Forty-five cases have been notified in the year to date compared to 13 at the same time in the previous year. The case reported overseas travel to Fiji during the incubation period.

Cryptosporidiosis:79 cases of cryptosporidiosis (78 confirmed and 1 under investigation) were notified in August 2015 compared to 49 cases notified during the same month of the previous year. The highest numbers of cases were reported from Counties Manukau and Waikato (19 cases each), and MidCentral (9 cases) DHBs. The cases ranged in age from 9 months to 64 years, with the highest numbers of cases in the 1–4 years (23 cases) and 20–29 years (19 cases) age groups. Among the cases for which risk factor information was recorded, 72.5% (29/40) had contact with farm animals, 42.1% (16/48) had contact with faecal matter or vomit, 36.4% (12/33) had consumed untreated water, 32.3% (12/36) had consumed food from a food premises, 27.0% (10/37) had recreational water contact, and 15.8% (6/38) had contact with other symptomatic people during the incubation period.

Haemophilus influenzae serotype b disease: Five cases of H. influenzae serotype b disease were notified in August 2015. After further investigation, all cases have been found not to meet the case criteria.

Legionellosis: Eight cases of legionellosis (5 confirmed, 2 probable and 1 under investigation) were notified in August 2015 compared to nine cases notified during the previous month, and four during the same month of the previous year. The highest numbers of cases were reported from Northland and Waitemata DHBs (2 cases each). The Legionella species was identified for seven cases as: L. pneumophila (5 cases) and L. longbeachae (2 cases). The increase in legionellosis notifications for the year (107 compared with 65 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.

Leprosy: Two confirmed cases of leprosy (one tuberculoid and one lepromatous) were notified in August 2015. The cases were both male, one in the 10–14 years age group from Bay of Plenty DHB and the other in the 30–39 years age group from Auckland DHB. Both cases reported overseas travel during the incubation period (Philippines, Kiribati).

Leptospirosis: Seven cases of leptospirosis (1 confirmed and 6 under investigation) were notified in August 2015 compared to three 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, and four remain under investigation. The highest numbers of cases were reported from South Canterbury and Southern DHBs (2 cases each). Occupational exposure risk factor information was recorded for two cases, both were farm workers. The Leptospira species was recorded for one case, L. Pomona.

Measles: Two cases of measles were notified in August 2015 compared to zero cases notified during the previous month, and seven during the same month of the previous year. After further investigation, both cases have been found not to meet the case criteria.

Meningococcal disease: Fifteen cases of meningococcal disease were notified in August 2015 (14 confirmed and 1 probable) compared to seven cases notified during the same month of the previous year. The highest numbers of cases were reported from Waitemata (3 cases), and Taranaki, Hawke’s Bay, and Capital & Coast (2 cases each) DHBs. Seven cases were aged under 5 years: 1–4 years age group (4 cases), and children aged under 1 year (3 cases). All cases were hospitalised and one death was reported. All cases were laboratory confirmed and the strain type was determined for all cases: group B (11 cases including three cases of B:P1.7-2,4), group Y (2 cases), group W135 (1 case), and group C (1 case).

Pertussis: 175 cases of pertussis were notified in August 2015 compared to 74 cases in the same month of the previous year. After further investigation, six cases have since been found not to meet the case criteria. Seven cases were hospitalised and no deaths were reported. There were 65/169 (38.5%) cases laboratory-confirmed (35 by isolation, 24 by PCR, and 6 by isolation and PCR). The highest numbers of cases were reported from Southern (63 cases), Canterbury (27 cases), and Nelson Marlborough (22 cases) DHBs. The cases ranged in age from 2 months to 81 years, with 17.8% under 5 years of age (including 9 cases aged less than 1 year). The highest numbers of cases were in the 40–49 years (25 cases), 5–9 years (22 cases) and 1–4 years, 10–14 years and 50–59 years (21 cases each) age groups. The vaccination status was recorded for 87.8% (72/82) of cases aged under 20 years. Of these, 13 were reported as not vaccinated, eight received one dose of vaccine, one received two doses of vaccine, and 48 received three or more doses (including seven who had received all five doses). Two cases were immunised but had no dose information recorded. Of the cases where the relevant information was recorded 50.0% (74/148) attended school, pre-school or childcare, and 33.3% (31/93) had contact with a laboratory-confirmed pertussis case. Two finalised B. pertussis outbreaks were created in August (7 cases).

Rheumatic fever: Eight cases of rheumatic fever (7 initial attack and 1 recurrent attack) were notified in August 2015, compared to 19 cases during the same month of the previous year. All cases were from the North Island; Auckland (3 cases), Hutt Valley (2 cases), Counties Manukau, Waikato and Capital & Coast (1 case each) DHBs. Cases ranged in age from 9 to 24 years, and were in the 5–9 years (2 cases), 10–14 years (3 cases), 15–19 years (1 case), and 20–29 years (2 cases) age groups. Cases were reported in Pacific peoples (6 cases) and Māori (2 cases) ethnic groups. Hospitalisation status was recorded for 75.0% (6/8) of the cases, all of which 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.  

Salmonellosis:60 cases of salmonellosis (57 confirmed and 3 under investigation) were notified in August 2015 compared to 64 cases notified during the same month of the previous year. After laboratory testing one case was updated to paratyphoid fever. The highest numbers of cases were reported from Canterbury (11 cases) and Southern (10 cases) DHBs. The cases ranged in age from 3 months to 92 years, with the highest numbers of cases in the 1–4 years (12 cases), 40–49 years (9 cases), and 20–29 years (8 cases) age groups. Twelve cases were hospitalised. The Salmonella serotypes were identified in 53/59 (89.8%) of the cases, the most common were S. Typhimurium phage type 56 variant (11 cases) and S. Brandenburg (7 cases). Uncommon Salmonella serotypes confirmed this month included S. Alachua, S. Albany and S. Wangata (1 case each). Among the cases for which risk factor information was recorded 48.4% (15/31) had travelled overseas, 34.8% (8/23) had consumed food from a food premises, 28.0% (7/28) had recreational water contact, 26.1% (6/23) had contact with faecal matter or vomit, and 25.0% (6/24) had contact with farm animals.

Taeniasis: Two cases of taeniasis were notified in August 2015. The cases were a female in the 20–29 years and a male in the 40–49 years age groups from Waitemata and Counties Manukau DHBs, respectively. Both cases reported overseas travel during the incubation period, to Thailand and the Central African Republic.

VTEC/STEC infection:39 cases of VTEC/STEC infection (38 confirmed and 1 under investigation) were notified in August 2015 compared to 17 cases notified during the same month of the previous year (Figure 2). The highest numbers of cases were reported from Waitemata (11 cases), and Waikato and Canterbury (6 cases each) DHBs. The highest numbers of cases occurred in the 1–4 years (8 cases) and 70+ years (6 cases) age groups. Four cases were hospitalised. Thirty-eight cases were confirmed by the Enteric Reference Laboratory as being infected with VTEC/STEC. The serotype was identified for 20 cases as Escherichia coli O157:H7 (12 cases) and non-O157 (8 cases). Among the cases for whom risk factor information was recorded, 62.5% (10/16) had contact with animals, 46.7% (7/15) had contact with children in nappies, and 18.8% (3/16) had contact with a person with similar symptoms. The increase 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.

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Report:

Monthly Notifiable Disease Surveillance Report - August 2015

Tables:

Monthly National Totals - August 2015

Monthly DHB Totals - August 2015

Monthly Rolling Totals - August 2015

 

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Monthly Notifiable Disease Surveillance Report - August 2015

Tables:

Monthly National Totals - August 2015

Monthly DHB Totals - August 2015

Monthly Rolling Totals - August 2015

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