Monthly Notifiable Disease Surveillance Report - Nov 2020

Wednesday 19th May 2021


Key Notifiable Disease Trends

Overall decrease in notifications: There was a decrease in the incidence of most notifiable diseases in November 2020, compared with November 2019. This is most likely due to behavioural changes as a result of public health messaging about the COVID-19 pandemic, and the dramatic reduction in overseas travel.

COVID-19: There were 117 cases of COVID-19 reported in November 2020 (100 confirmed and 17 under investigation). Of the 100 confirmed cases, 92 (92.0%) were imported cases in managed isolation/quarantine (MIQ) facilities at the time of diagnosis, including nine cases from an international cricket team, three were staff in MIQ facilities and five were community cases (refer to the outbreak section for more details). No cases were hospitalised and no deaths were reported. More information can be found on the ESR COVID-19 dashboard.

Tuberculosis: There were 46 cases of tuberculosis notified in November 2020, bringing the total to 316 for the year to date compared with 287 for the same period in 2019. Of the 289 confirmed and probable cases for 2020 to date, 79.9% (231/289) were born overseas, which is a similar proportion to the 83.5% (239/286) of cases for the same period in 2019.

Yersiniosis: There were 157 cases of yersiniosis (149 confirmed and 8 under investigation) reported in November 2020, compared with 138 cases for the same month in 2019. Of the 83 cases that were typed, 36 (43.4%) were due to Yersinia enterocolitica biotype 2/3 serotype O:9, 34 (41.0%) were due to Y. enterocolitica biotype 1A (all serotypes) and 11 (13.3%) 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

COVID-19: An outbreak of COVID-19 involving six cases was reported in November 2020. The index case was a defence force worker at an Auckland quarantine facility. Three of the remaining five cases also worked for the defence force and were based in Wellington, while the remaining two cases were from Auckland and lived in the same building. Genome sequencing for the index case showed a direct link to two returnees who were part of a family group staying in the quarantine facility.

Scombroid Poisoning: An outbreak of scombroid (histamine) poisoning was reported in November 2020. A total of 91 cases were reported with onset dates from 8 to 11 November. All of the cases were linked to the consumption of trevally fish from HelloFresh, a national food delivery service. Cases were geographically dispersed with most cases occurring in the Auckland (37.4%, 34/91) and Wellington (30.8%, 28/91) regions. Histamine testing was carried out on fish samples, with results indicating histamine levels above regulatory limits. HelloFresh initiated a consumer level recall of trevally fillets on 10 November.

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 - Nov 2020

Tables:

Monthly National Tables - November 2020 (.xlsx)

Monthly DHB Tables - November 2020 (.xlsx)

Monthly Rolling Tables - November 2020 (.xlsx)

 

DOWNLOADS

Monthly Notifiable Disease Surveillance Report - Nov 2020

Tables:

Monthly National Tables - November 2020 (.xlsx)

Monthly DHB Tables - November 2020 (.xlsx)

Monthly Rolling Tables - November 2020 (.xlsx)

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