Monthly Notifiable Disease Surveillance Report - Nov 2015

Monday 23rd September 2019


Key notifiable disease trends

Cholera: One confirmed case of cholera was notified in November. The case was a male in the 50-59 years age group from Hawke’s Bay DHB. After further investigation the case has since been found not to meet the case criteria.

Hepatitis A: Five confirmed cases of hepatitis A were notified in November 2015 compared to seven cases notified during the previous month and 12 cases notified during the same month of the previous year (Figure 1). All five cases were lab confirmed. Ethnicity was recorded for all cases, and were reported in the European or Other (3 cases), Māori and Middle Eastern Latin American and African (1 case each) ethnic groups. The highest number of cases was reported from Waitemata (3 cases), followed by Bay of Plenty and Hutt Valley (1 case each) DHBs. The cases ranged in age from 26–45 years, with the highest number of cases in the 20–29 years and 40–49 years age groups (2 cases each), followed by the 30–39 years age group (1 case). One interim hepatitis A outbreak was reported in November (case numbers yet to be determined). The case that was not associated with the outbreak had overseas travel during the incubation period recorded, the case had been to Chile.

Hepatitis C: 12 cases (6 confirmed and 6 under investigation) were notified in November compared to five confirmed cases notified during the previous month and zero 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 following section relates to confirmed cases only. Cases were reported from Hutt Valley (2 cases), and Hawke’s Bay, Canterbury, West Coast and Southern (1 case each) DHBs. Cases ranged in age from 22–61 years. Among the cases for which risk factor information recorded, 100.0% (4/4) had a history of intravenous drug use and 50.0% (2/4) had household contact with a confirmed case or carrier.

Hepatitis NOS: One confirmed case of hepatitis NOS (hepatitis delta) was notified in November. The case was a male in the 20–29 years age group from Waitemata DHB, and was also a hepatitis B carrier. Risk factor information included a body piercing or tattooing procedure in September 2015 in Kiribati.

Hydatid disease: One probable case of hydatid disease was notified in November 2015. The case was a female in the 60–69 years age group from Hawke’s Bay DHB, and had a previous diagnosis of liver hydatid disease in 2007 (that was not notified). Further investigation into historic risk factors is under way.

Legionellosis: 47 cases of legionellosis (12 confirmed, 18 probable and 17 under investigation) were notified in November 2015 compared to 29 cases notified during the previous month, and 21 during the same month of the previous year (Figure 1). The highest numbers of cases were reported from MidCentral (15 cases) and Canterbury (7 cases) DHBs. The Legionella species was identified for 17 cases as: L. longbeachae (13 cases), L. pneumophila (3 cases) and L. sainthelensi (1 case). One interim Legionella outbreak was reported in November (case numbers yet to be determined). The increase in legionellosis notifications for the year (200 compared with 103 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.

Leptospirosis: Nine cases of leptospirosis (5 confirmed and 4 under investigation) were notified in November 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. The cases were reported from Hawke’s Bay (3 cases), Waikato (2 cases), and Bay of Plenty, West Coast and Southern (1 case each) DHBs. Occupational exposure risk factor information was recorded for 62.5% (5/8) of cases, four were farmers (one of which had exposure to rats), and one was a butcher. The Leptospira species was recorded for three cases; L. Hardjo (2 cases) and L. Tarassovi (1 case).

Listeriosis: Two cases of listeriosis (2 perinatal and 1 non-perinatal) were notified in November 2015. The mothers in the perinatal cases were both in the 20–29 years age group, were of Pacific peoples and Asian ethnicity, and were from Counties Manukau and Waitemata DHBs respectively. Both infants survived after delivery. Gestation information was recorded for one case, which was born at 33 weeks. The serotype of all three cases was Listeria monocytogenes serotype 4. The non-perinatal case was a male in the 70 years and over age group from Bay of Plenty DHB.

Salmonellosis:72 cases of salmonellosis (69 confirmed and 3 probable) were notified in November 2015 compared to 61 cases notified during the same month of the previous year. The highest numbers of cases were reported from Southern (15 cases) and Waitemata (12 cases) DHBs. The cases ranged in age from 8 months to 79 years, with the highest numbers of cases in the 1–4 years (14 cases), 40–49 years (13 cases), and 50–59 years (11 cases) age groups. Ten cases were hospitalised. The Salmonella serotypes were identified in 83.3% (60/72) of the cases, the most common were S. Typhimurium phage type 135 (10 cases), S. Typhimurium phage type 9 (7 cases) and S. Typhimurium phage type 56 variant (5 cases). Uncommon Salmonella serotypes confirmed this month included S. Wangata (2 cases), S. Adelaide, S. Cleveland and S. Victoria (1 case each). Among the cases for which risk factor information was recorded 51.5% (17/33) had consumed food from a food premises, 43.8% (14/32) had contact with farm animals, 27.1% (13/48) had travelled overseas, and 26.7% (8/30) had recreational contact with water during the incubation period. One interim Salmonella outbreak was reported in November (case numbers yet to be determined).

Taeniasis: One case of taeniasis was notified in November 2015. The case was a male in the 20–29 years age group from Auckland DHB. Overseas travel during the incubation period was recorded, the case had been to Singapore, Cambodia and Malaysia.

VTEC/STEC infection:38 cases of VTEC/STEC infection (34 confirmed and 4 under investigation) were notified in November 2015 compared to 11 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 (5 cases) DHBs. The highest numbers of cases occurred in the 1–4 years (11 cases), 30–39 years (6 cases), and 50–59 years and 70+ years (5 cases each) age groups. Seven cases were hospitalised. Nineteen 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 (10 cases) and non-O157 (9 cases). Among the cases for which risk factor information was recorded, 80.0% (12/15) had contact with animals, 50.0% (7/14) had contact with children in nappies, and 42.1% (8/19) 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. Three finalised VTEC/STEC outbreaks (8 cases) and one interim outbreak (case numbers yet to be determined) were created in November.

Yersiniosis: 115 cases of yersiniosis (114 confirmed and 1 under investigation) were notified in November 2015 compared to 47 cases notified during the same month of the previous year (Figure 2). The highest numbers of cases were reported from Canterbury (19 cases), Capital and Coast (17 cases) and Waikato (12 cases) DHBs. The cases ranged in age from 5 months to 82 years, with the highest numbers of cases in the 50–59 years (26 cases), 20–29 years (20 cases), and 40–49 years (12 cases) age groups. Nine cases were hospitalised. The Yersinia species involved was identified for 86.1% (99/115) cases; all were Y. enterocolitica. The most common biotypes reported were Y. enterocolitica biotype 2 (51 cases), 1A (31 cases) and 3 (9 cases). Among the cases for which risk factor information was recorded, 69.5% (41/59) had consumed food from a food premises, 35.7% (25/70) had contact with farm animals, 31.8% (21/66) had contact with faecal matter or vomit, and 28.1% (18/64) had recreational contact with water during the incubation period. 

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Report:

Monthly Notifiable Disease Surveillance Report - November 2015

Tables:

Monthly National Totals - November 2015

Monthly DHB Totals - November 2015

Monthly Rolling Totals - November 2015

 

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Monthly Notifiable Disease Surveillance Report - November 2015

Tables:

Monthly National Totals - November 2015

Monthly DHB Totals - November 2015

Monthly Rolling Totals - November 2015

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