MONTHLY NOTIFIABLE DISEASE SURVEILLANCE REPORT

Transcription

1 ISSN X November 2017 MONTHLY NOTIFIABLE DISEASE SURVEILLANCE REPORT Data contained within this monthly report is based on information recorded on EpiSurv by Public Health Service (PHS) staff at 6 December Changes made to EpiSurv data after this date will not be reflected in this report. The results presented may be updated and should be regarded as provisional. Table of contents 1. Key notifiable disease trends 1 2. Outbreaks 3 3. Deaths from notifiable diseases 4 4. Trends in selected diseases to October Data tables 6 1. Key notifiable disease trends Cryptosporidiosis: 119 cases of cryptosporidiosis (118 confirmed and 1 under investigation) were notified in November 2017 compared to 95 cases notified in November The 12-month rate for the period ending 30 November (25.6 cases per 100,000 population) was slightly higher than for the same period in the previous year (22.3 per 100,000). Cases ranged in age from 9 months to 95 years, with the highest numbers of cases in the 1 4 years (31 cases) and years (23 cases) age groups. Among the cases for which risk factor information was recorded, 54.1% (33/61) had contact with farm animals, 41.5% (22/53) consumed untreated water, 40.0% (24/60) had attended school, preschool or childcare, 26.8% (15/56) had contact with faecal matter or vomit, 21.6% (11/51) had contact with sick animals and 20.4 (11/54) had consumed food from a food premises) during the incubation period. Three finalised Cryptosporidium outbreak (8 cases) were created in November. Dengue Fever: 25 cases of dengue fever (24 confirmed and 1 under investigation) were notified in November 2017 compared to 13 cases notified in November All cases had been overseas during the incubation period. The countries/regions visited included Samoa (16 cases), India (5 cases), American Samoa, China, French Polynesia, Malaysia, North Africa, Singapore, and Sri Lanka (1 case each). Three cases reported overseas travel to more than one country. Hepatitis A: 10 cases of hepatitis A (9 confirmed and 1 under investigation) were notified in November 2017 compared to eight cases notified in October 2017 and three cases notified in November The cases were reported from Waikato, MidCentral (3 cases each), Northland (2 cases), Auckland and Counties Manukau (1 case each) DHBs. Nine cases were laboratory confirmed. Ethnicity was recorded for 80.0% (8/10) cases, and were reported as being in Māori (5 cases) and European or Other (3 cases). The cases ranged in age from 3 to 81 years, with the highest number of cases in the 1 4 years and years age groups (2 cases each). Risk factor information was recorded for six cases: eating recreationally collected shellfish (3 cases), attending a pre-school or childcare (2 cases) and overseas travel (1 case). Leptospirosis: 21 cases of leptospirosis (14 confirmed, 3 probable, and 4 under investigation) were notified in November 2017 compared to 12 cases notified in November The highest number of cases was reported in the years (6 cases) and years (5 cases) age groups. Occupation was recorded for 85.7% (18/21) of cases. Of these, 15 were engaged in occupation previously identified as high risk exposure to Leptospira species: farmers or farm workers (14 cases) and meat workers (1 case). Two additional cases reported exposure through contact with animal/manure. Four cases did not have any risk factor information recorded. One interim Leptospira outbreak (case numbers yet to be determined) was created in November. Monthly Notifiable Disease Surveillance Report November 2017 Page 1 of 7

2 Meningococcal disease: 11 cases of meningococcal disease (9 confirmed and 2 under investigation) were notified in November 2017 compared to 12 cases notified in November The highest number of cases were reported from Waitemata and Bay of Plenty (2 cases each) DHBs. The cases were in the less than one year (3 cases), 1 4 years, 70 years and over (2 cases each), 5 9 years, years, years, and (1 case each) age groups. Ten cases were hospitalised and no deaths were reported. Ten cases were laboratory confirmed and the group was determined for nine of these cases: group B (5 cases, including 2 NZ B:P1.7-2,4), group W (2 cases), group C (1 case) and group Y (1 case). Mumps: 261 cases of mumps (134 confirmed, 48 probable and 79 under investigation) were notified in November 2017 compared with one case notified in November 2016 (Figure 1). The 12-month rate for the period ending 30 November was 25.5 cases per 100,000 population. The highest numbers of cases were reported from Counties Manukau (91 cases), Auckland (74 cases), and Waitemata (41 cases) DHBs. The highest numbers of cases were in the years (95 cases) and years (54 cases) age groups. Ninety-one cases were recorded as being vaccinated against mumps, of which 70 cases had received two doses of the vaccine and 19 cases had received just one dose. Two further cases had been vaccinated, but no dose information was availableand 49 cases were recorded as non-vaccinated. Vaccination status was unknown for 82 cases One interim mumps outbreak (cases number yet to be determined) was created in November Pertussis: 436 cases of pertussis (211 confirmed, 146 probable, 7 suspected, and 72 under investigation) were notified in November 2017 compared to 107 cases in November 2016 (Figure 2). The 12-month rate for the period ending 30 November (38.1 cases per 100,000) was higher than for the same period in the previous year (22.6 per 100,000). Twenty cases were hospitalised and no deaths were reported. Forty-nine percent (215/436) of cases were laboratory-confirmed (33 by culture, 147 by PCR, and 35 by culture and PCR). The highest number of cases was reported from Nelson Marlborough DHB (86 cases), followed by Waikato (47 cases), Auckland (45 cases) and Waitemata (40 cases) DHBs. Cases ranged in age from 1 month to 92 years, with 11.7% (51/436) under five years of age (including 19 cases aged less than 1 year). The highest numbers of cases were in the years (69 cases), 5 9 years (67 cases), years (51 cases) and years (50 cases) age groups. Shigellosis: 26 confirmed cases of shigellosis were notified in November 2017 compared with 18 cases notified in November The 12-month rate for the period ending 30 November (5.2 cases per 100,000 population) was higher than at the same time in the previous year (3.3 per 100,000). The highest number of cases was reported from Auckland (5 cases) DHB. The serotype involved was recorded for 73.1% (19/26) of cases: S. sonnei biotype g (5 cases), S. flexneri 1b (4 cases), S. flexneri 2a, S. sonnei biotype a (3 cases each), S. flexneri 3b (2 cases), S. boydii 4 and S. flexneri 2b (1 case each). Information on overseas travel during the incubation period was recorded for 65.4% (17/26) of cases, of which 70.6% (12/17) of cases recorded overseas travel during this period. Countries visited included: India, Indonesia, Tonga, Vanuatu (2 cases each), Cambodia, Croatia, Fiji, Kiribati, Samoa and Vietnam (1 case each). Two cases reported overseas travel to more than one country. VTEC/STEC infection: 48 cases of VTEC/STEC infection (39 confirmed and 9 under investigation) were notified in November 2017 compared to 32 cases notified in November The 12-month rate for the period ending 31 November 2017 (11.5 cases per 100,000 population) was higher than at the same time period in the previous year (9.3 cases per 100,000 population). The highest numbers of cases were reported from Southern (18 cases) and Waitemata (9 cases) DHBs. Cases ranged in age from 1 month to 85 years, with the highest number of cases in the 1 4 years (9 cases) age group. Nine cases were hospitalised. Twenty cases have been confirmed by the Enteric Reference Laboratory as being infected with VTEC/STEC, and of these the serotype was identified as Escherichia coli O157:H7 (7 cases) and non-o157 (13 cases). Of the cases for which risk factor information was recorded, 70.0% (21/30) had contact with animals, 29.6% (8/27) had contact with children in nappies, 22.6% (7/31) had contact with a person with similar symptoms and 18.5% (5/27) had recreational contact with water during the incubation period. One final (2 cases) and one interim VTEC/STEC infection outbreak (case numbers yet to be determined) was created in November. Monthly Notifiable Disease Surveillance Report November 2017 Page 2 of 7

3 2. Outbreaks During November 2017, a total of 76 outbreaks (29 final and 47 interim) were created in EpiSurv (Table 1 and Table 2). Sixty-five (85.5%) were outbreaks of acute gastroenteritis (22 finalised and 43 interim) involving 480 cases in total. This compares with 30 acute gastroenteritis outbreaks involving 683 cases in total created during the same month of the previous year. Of the 65 acute gastroenteritis outbreaks, the pathogens were recorded as norovirus (23 outbreaks) and Clostridium botulinum (1 outbreak). The most commonly reported mode of transmission in acute gastroenteritis outbreaks (46.2%, 30/65) was person-to-person (28 primary and 2 secondary). Of the outbreaks that had an exposure setting recorded (64.6%, 42/65) the most commonly reported setting were long term care facilities (30 outbreaks) and childcare centres (4 outbreaks). Table 1. Summary of final outbreaks created in EpiSurv during November 2017 Organism/Toxin/Illness DHB(s) where exposure occurred Number of outbreaks Total number of cases Cryptosporidium MidCentral, Southern 3 8 Escherichia coli O157:H7 Counties Manukau 1 2 Gastroenteritis 1 Waitemata, Auckland, Waikato, Taranaki, Hawke's Bay, MidCentral, Capital & Coast Giardia Southern 1 3 Hepatitis A virus Northland 1 3 Norovirus Auckland, Counties Manukau, Bay of Plenty, Hawke's Bay, MidCentral, Hutt Valley, Capital & Coast, Canterbury, Southern Shigella Capital & Coast 1 2 Total Includes outbreak reported to PHSs prior to November 2017: gastroenteritis (1) reported in October. Monthly Notifiable Disease Surveillance Report November 2017 Page 3 of 7

4 Table 2. Summary of interim outbreaks created in EpiSurv during November 2017 Organism/Toxin/Illness DHB(s) where exposure occurred Number of outbreaks Total number of cases 1 Clostridium botulinum Waikato 1 3 Escherichia coli O26:H11 Southern 1 3 Gastroenteritis Waitemata, Auckland, Counties Manukau, Waikato, Tairawhiti, Taranaki, Hawke's Bay, MidCentral, Hutt Valley, Wairarapa, Canterbury, Southern Leptospira Hawke's Bay 1 0 Mumps virus Northland, Southern 2 2 Norovirus Northland, Auckland, Bay of Plenty, Whanganui, Capital & Coast, West Coast, Canterbury, Southern Total Interim outbreak(s) where total number of cases had not been completed. 3. Deaths from notifiable diseases One death, where the primary cause of death was a notifiable disease, was reported in November 2017 (Table 3). Table 3. Summary of deaths from notifiable diseases reported during November 2017 Disease District health board Age group (years) Invasive pneumococcal disease Capital & Coast 70+ Monthly Notifiable Disease Surveillance Report November 2017 Page 4 of 7

5 4. Trends in selected diseases to November 2017 Figure 1. Mumps virus notifications by month, January 2010 November 2017 Figure 2. Pertussis notifications by month, January 2010 November 2017 Monthly Notifiable Disease Surveillance Report November 2017 Page 5 of 7

6 5. Data tables National Notifiable Disease Surveillance Data November 2017 Current Year ¹ Previous Year Disease Campylobacteriosis Cryptosporidiosis Dengue fever Gastroenteritis³ Giardiasis Haemophilus influenzae type b Hepatitis A Hepatitis B⁴ Hepatitis C⁴ Invasive pneumococcal disease Legionellosis Leptospirosis Listeriosis Malaria Measles Meningococcal disease Mumps Paratyphoid fever Pertussis Rheumatic fever⁵ Rickettsial disease Rubella Salmonellosis Shigellosis Tuberculosis disease Typhoid fever VTEC/STEC infection Yersiniosis Cumulative Current 12 November total since 1 Month 2017 Cases January Rate² November 2016 Cases Cumulative Current total since 1 12 Month January Rate² ¹ These data are provisional. ² Rate is based on the cumulative total for the current year (12 months up to and including November 2017) or the previous year (12 months up to and including November 2016), expressed as cases per This includes cases still under investigation. ³ Cases of gastroenteritis from a common source or foodborne intoxication. ⁴ Only acute cases of this disease are currently notifiable. ⁵ Numbers are based on report date. This may not be a good indicator of newly incident cases as a high proportion of notifications have substantial reporting delays. Other notifiable infectious disease reported in November: Chikungunya fever (2), Cholera (1), Hepatitis NOS (2), Hydatid disease (2), Taeniasis (1), Trichinellosis (1), Zika virus (1) Monthly Notifiable Disease Surveillance Report November 2017 Page 6 of 7

7 Southern South Canterbury Canterbury West Coast Nelson Marlborough Wairarapa Capital and Coast Hutt Valley MidCentral Whanganui Hawke's Bay Taranaki Tairawhiti Bay of Plenty Lakes Waikato Counties Manukau Auckland Waitemata Northland Notifiable Disease Surveillance Data by District Health Board November 2017 Cases¹ and current rate² for November 2017 by District Health Board³ Disease Campylobacteriosis Cryptosporidiosis Dengue fever Gastroenteritis Giardiasis Haemophilus influenzae type b Hepatitis A Hepatitis B Hepatitis C Invasive pneumococcal disease Legionellosis Leptospirosis Listeriosis Malaria Measles Meningococcal disease Mumps Paratyphoid fever Pertussis Q fever Rheumatic fever⁴ Rickettsial disease Rubella Salmonellosis Shigellosis Tuberculosis disease Typhoid fever Viral Haemorrhagic Fever VTEC/STEC infection Yersiniosis Cases Rate Cases Rate Cases Rate Cases Rate Cases Rate Cases Rate Cases Rate Cases Rate Cases Rate Cases Rate Cases Rate Cases Rate Cases Rate Cases Rate Cases Rate Cases Rate Cases Rate Cases Rate Cases Rate Cases Rate Cases Rate Cases Rate Cases Rate Cases Rate Cases Rate Cases Rate Cases Rate Cases Rate Cases Rate Cases Rate ¹ These data are provisional. ² Current rate is based on the cumulative total for the 12 months up to and including November 2017 expressed as cases per This includes cases still under investigation. ³ Further data are available from the local Medical Officer of Health. ⁴ Rates are based on report date. This may not be a good indicator of newly incident cases as a high proportion of notifications have substantial reporting delays. Monthly Notifiable Disease Surveillance Report November 2017 Page 7 of 7