Monthly Notifiable Disease Surveillance Report - Sep 2015

Thursday 19th September 2019


Key notifiable disease trends

Cryptosporidiosis:175 cases of cryptosporidiosis (173 confirmed, 1 probable and 1 under investigation) were notified in September 2015 compared to 120 cases notified during the same month of the previous year. The highest numbers of cases were reported from Waikato (54 cases), Counties Manukau (22 cases) and MidCentral (19 cases) DHBs. The cases ranged in age from 9 months to 79 years, with the highest numbers of cases in the 1–4 years (55 cases), 20–29 years (37 cases) and 5–9 years (26 cases) age groups. Among the cases for which risk factor information was recorded, 78.0% (85/109) had contact with farm animals, 48.3% (43/89) had consumed untreated water, 37.4% (37/99) had contact with faecal matter or vomit, 23.8% (25/105) had contact with other symptomatic people, 14.3% (14/98) had consumed food from a food premises, and 10.9% (11/101) had recreational water contact during the incubation period. Three finalised Cryptosporidium outbreaks (14 cases) and one interim outbreak (case numbers yet to be determined) were created in September.

Dengue fever: Four cases of dengue fever (2 confirmed and 2 under investigation) were notified in September 2015 compared to five cases (4 confirmed and 1 probable) notified in the same month of the previous year (Figure 1). All cases had been overseas during the incubation period, with one case visiting two countries. The countries visited included Samoa (2 cases), Australia (1 case), Indonesia (1 case) and Thailand (1 case).

Giardiasis: 124 cases of giardiasis (123 confirmed and 1 under investigation) were notified in September 2015 compared to 142 cases notified during the same month of the previous year. The highest numbers of cases were reported from Auckland and Counties Manukau (15 cases each), and Waitemata (14 cases) DHBs. Among the cases where risk factor information was recorded, 43.5% (20/46) had consumed untreated water, 34.5% (19/55) had contact with faecal matter or vomit, and 29.6% (16/54) had contact with other symptomatic people during the incubation period. Two finalised Giardia outbreaks (5 cases) and two interim outbreak (case numbers yet to be determined) were created in September.

Legionellosis: Eighteen cases of legionellosis (9 confirmed, 4 probable and 5 under investigation) were notified in September 2015 compared to eight cases notified during the previous month, and eight during the same month of the previous year. After further investigation three cases have since been found not to meet the case criteria. The highest numbers of cases were reported from Waitemata and Canterbury (4 cases each), and Northland (3 cases) DHBs. The Legionella species was identified for nine cases as: L. longbeachae (6 cases), L. pneumophila (2 cases) and L. dumoffii (1 case). The increase in legionellosis notifications for the year (127 compared with 73 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: One probable case of borderline leprosy was notified in September 2015. The case was male, in the 60–69 years age group and from Capital & Coast DHB. The case reported overseas travel to the Philippines during the incubation period.

Leptospirosis: One confirmed case of leptospirosis was notified in September 2015 compared to four cases notified during the same month of the previous year. The case was reported from Waikato DHB. Occupational exposure risk factor information was recorded, and the case was a farmer. The Leptospira species was not recorded.

Meningococcal disease: Eleven cases of meningococcal disease were notified in September 2015 (all confirmed) compared to seven cases notified during the same month of the previous year. The highest numbers of cases were reported from Bay of Plenty and MidCentral DHBs (2 cases each). Three cases were reported in each of the less than 1 year and 15–19 years age groups. Ten cases were hospitalised. All cases were laboratory confirmed and the strain type was determined for all cases: group B (8 cases including three cases of B:P1.7-2,4), group Y (2 cases), and group W135 (1 case).

Pertussis: 191 cases of pertussis were notified in September 2015 compared to 80 cases in the same month of the previous year (Figure 2). After further investigation two cases have since been found not to meet the case criteria. Twenty-one cases were hospitalised and no deaths were reported. Forty-seven percent (88/189) of cases were laboratory-confirmed (21 by isolation, 54 by PCR, and 13 by isolation and PCR). The highest numbers of cases were reported from Canterbury (60 cases), Southern (32 cases) and Auckland (18 cases) DHBs. Age was recorded for all cases except one. The cases ranged in age from 2 months to 82 years, with 16.0% under 5 years of age (including 9 cases aged less than 1 year). The highest numbers of cases were in the 5–9 years (33 cases), 10–14 years (24 cases), 40–49 years (22 cases) and 1–4 years (21 cases) age groups. The vaccination status was recorded for 83.8% (83/99) of cases aged under 20 years. Of these, 23 were reported as not vaccinated, four received one dose of vaccine, and 39 received three or more doses (including two who had received all five doses). Seventeen cases were immunised but had no dose information recorded. Of the cases where the relevant information was recorded 46.2% (73/158) attended school, pre-school or childcare, and 37.8% (37/98) had contact with a laboratory-confirmed pertussis case. Two finalised B. pertussis outbreaks were created in September (14 cases).

Rheumatic fever: Four cases of rheumatic fever (3 initial attack and 1 recurrent attack) were notified in September 2015, compared to 18 cases during the same month of the previous year. All cases were from the North Island; Auckland (2 cases), Waikato (1 case) and Hutt Valley (1 case) DHBs. Cases ranged in age from 9 to 21 years, and were in the 5–9 years, 10–14 years, 15–19 years and 20–29 years age groups (1 case each). Cases were reported in the Māori and Pacific peoples ethnic groups (2 cases each). Hospitalisation status was recorded for all 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.  

VTEC/STEC infection:37 cases of VTEC/STEC infection (34 confirmed and 3 under investigation) were notified in September 2015 compared to 21 cases notified during the same month of the previous year. The highest numbers of cases were reported from Waitemata (9 cases), Counties Manukau (6 cases), and Auckland, Northland and Waikato (4 cases each) DHBs. The highest numbers of cases occurred in the 1–4 years (8 cases), 70+ years (6 cases) and 40–49 years (5 cases) age groups. Ten cases were hospitalised. Thirty-three cases were confirmed by the Enteric Reference Laboratory as being infected with VTEC/STEC. The serotype was identified for 26 cases as Escherichia coli O157:H7 (15 cases) and non-O157 (11 cases). Among the cases for whom risk factor information was recorded, 80.0% (12/15) had contact with animals, 25.0% (3/12) had contact with children in nappies, and 12.5% (2/16) 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. One finalised VTEC/STEC outbreak was created in September (4 cases).

Zika virus: One confirmed case was notified in September 2015. The case was a female from Auckland DHB, who reported overseas travel to Samoa during the incubation period.

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Report:

Monthly Notifiable Disease Surveillance Report - Sep 2015

Tables:

Monthly National Totals - September 2015

Monthly DHB Totals - September 2015

Monthly Rolling Totals - September 2015

 

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Monthly Notifiable Disease Surveillance Report - Sep 2015

Tables:

Monthly National Totals - September 2015

Monthly DHB Totals - September 2015

Monthly Rolling Totals - September 2015

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