Monthly Notifiable Disease Surveillance Report - Jun 2020

Sunday 1st November 2020


Key Notifiable Disease Trends

Overall decrease in notifications: There was a decrease in the incidence of most notifiable diseases in June 2020, compared with June 2019. This is most likely due to behavioural changes as a result of public health messaging about the COVID-19 pandemic, and the national lockdown which began on 25 March. It is likely that exposure to some risk factors decreased during this time, but also that less people sought healthcare and therefore were not tested for many diseases.

COVID-19: There were 24 cases of COVID-19 reported in June 2020, all of which were confirmed. The majority of cases (20/24, 83.3%) were reported from the Auckland region. All but two cases were in managed isolation facilities at the time of diagnosis; the remaining two were recent arrivals in self-isolation. Two cases were hospitalised, and no deaths were reported. More information can be found on the ESR COVID-19 dashboard.

Legionellosis: There were 15 cases of legionellosis (13 confirmed and 2 under investigation) reported in June 2020, compared with three for the same month in 2019. Of the 13 confirmed cases, 10 (76.9%) were from the Auckland region. The majority (11/13, 84.6%) were males aged 50 years and over. Eleven confirmed cases were due to Legionella pneumophila which is associated with warm water systems, one was due to L. longbeachae and one L. micdadei. No common source or location has been identified for the Auckland cases.

Vibrio parahaemolyticus infection: Twelve cases of Vibrio parahaemolyticus infection were reported as acute gastroenteritis in June 2020. This is higher than expected for June. All 12 cases were from the top half of the North Island: Waikato (3), Counties Manukau and Bay of Plenty (2 each), Northland, Auckland, Tairawhiti, Hawke’s Bay and Lakes DHBs (1 each). Nine of the cases are known to have consumed mussels harvested from two growing areas in the Coromandel. Ministry for Primary Industries (MPI) is investigating further and issued a media statement on 24 June urging people to ensure they cook raw mussels before eating them.

Yersiniosis: There were 77 cases of yersiniosis (76 confirmed and 1 under investigation) reported in June 2020, compared with 60 for the same month in 2019. The DHBs that reported the largest increase compared to June 2019 were Waitemata, Auckland, Waikato and Capital & Coast. Of the 55 cases that were typed, 34 (61.8%) were due to Yersinia enterocolitica biotype 2/3 serotype O:9 and 12 (23.6%) were due to Y. enterocolitica biotype 4 serotype O:3. Y. enterocolitica biotype 2/3 serotype O:9 is the most common biotype isolated in New Zealand.

 

OUTBREAKS

Influenza-like illness / acute respiratory infection: Three outbreaks of influenza-like illness and one of acute respiratory infection were reported in June 2020. All four outbreaks were reported from the Wellington region. Three outbreaks were in long-term care facilities and one in a school. No pathogen was identified in any of the outbreaks.

Note: Click on the document links below to open. These documents are in PDF format. You will need to download the free Adobe Acrobat Reader to view them.

Report:

Monthly Notifiable Disease Surveillance Report - June 2020

Tables:

Monthly National Tables - June 2020 (.xlsx)

Monthly DHB Tables - June 2020 (.xlsx)

Monthly Rolling Tables - June 2020 (.xlsx)

 

DOWNLOADS

Monthly Notifiable Disease Surveillance Report - June 2020

Tables:

Monthly National Tables - June 2020 (.xlsx)

Monthly DHB Tables - June 2020 (.xlsx)

Monthly Rolling Tables - June 2020 (.xlsx)

Ph: +64 4 914 0700 Fax: +64 4 914 0770 Email: survqueries@esr.cri.nz