Monthly Notifiable Disease Surveillance Report - May 2021

Thursday 29th July 2021


Key Notifiable Disease Trends

Enteric Diseases: There was an increase in the incidence of notifiable enteric diseases in May 2021 compared with May 2020. The lower number of cases seen in May 2020 coincides with New Zealand introducing stringent measures against COVID-19, such as social distancing, increased hygiene practices, working from home and children not attending school or pre-school. All of these measures are also likely to prevent the spread of enteric diseases.

COVID-19: There were 55 cases of COVID-19 reported in May 2021 (54 confirmed and 1 under investigation), compared with 20 for the same month in 2020. All 54 confirmed cases were in managed isolation/quarantine (MIQ) facilities at the time of diagnosis. No cases were hospitalised, and no deaths were reported. More information can be found on the ESR COVID-19 dashboard.

Invasive pneumococcal disease: There were 41 cases of invasive pneumococcal disease reported in May 2021, compared with 11 forthe same month in 2020, and 33 in May 2019. All 41 cases were laboratory confirmed. The majority (26/41, 63.4%) were aged 60 years and over. A serotype was identified in 39 (95.1%) cases, and the most common serotype was 19A, accounting for 11 (28.2%) cases, including four cases aged under 5 years.

Yersiniosis: There were 116 cases of yersiniosis reported in May 2021, compared with 52 for the same month in 2020, and 77 in May 2019. Almost half (51/116, 44.0%) of the cases were from the Auckland region. Almost one third (30.6%, 26/85) of cases with an ethnicity recorded were Asian. Yersinia enterocolitica biotype 2/3 serotype O:9 was identified in the majority (73.0%, 65/89) of cases that had been typed.

OUTBREAKS

Cryptosporidiosis: An outbreak of cryptosporidiosis involving 11 cases (5 confirmed and 6 probable) linked to consumption of raw milk was reported from Taranaki DHB in May 2021. Of the five confirmed cases, three were identified as Cryptosporidium parvum subtype IIaA18G3R1, while the subtype for the remaining two cases could not be identified. Samples from two additional cases that were not linked to the outbreak were also identified as having the same subtype as the outbreak cases. MPI visited the milk supplier and collected raw milk samples, which tested negative for Cryptosporidium.

Salmonellosis: Two further cases of Salmonella Enteritidis sequence type 11 reported in May 2021 have been identified as belonging to the Enteritidis_2019_C_01 cluster that was first reported in the March monthly report. From January to May 2021 there have been 37 cases reported, and since May 2019 the total number of cases associated with this strain is 103. Case and environmental investigations are continuing. MPI issued a media release on 27 May advising that Salmonella Enteritidis had been detected at an Auckland poultry farm and reminding people to follow food safety practices.

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 - May 2021

Tables:

Monthly National Tables - May 2021 (.xlsx)

Monthly DHB Tables - May 2021 (.xlsx)

Monthly Rolling Tables - May 2021 (.xlsx)

 

DOWNLOADS

Monthly Notifiable Disease Surveillance Report - May 2021

Tables:

Monthly National Tables - May 2021 (.xlsx)

Monthly DHB Tables - May 2021 (.xlsx)

Monthly Rolling Tables - May 2021 (.xlsx)

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