Human Salmonella Isolates, 2016 No. 2, February

Friday 20th September 2019


Summary

The number of isolates (n=132) confirmed this month showed an increase in comparison to the number of isolates confirmed in February 2015 (n=120). Salmonella Typhimurium phage type 9 (1.7% in February 2015 vs 6.8% in February 2016) was the most common serotype confirmed this month. Uncommon serotypes confirmed this month included S. Arechavaleta (9 human cases since it was first confirmed in New Zealand in 1997), S. Brunei (2 human cases since it was first confirmed in New Zealand in 1994), S. Cleveland (2 human cases since it was first confirmed in New Zealand in 2015), S. Typhimurium phage type 2 (2 human cases since it was first confirmed in New Zealand in 1999), and S. Waycross (6 human cases since it was first confirmed in New Zealand in 1998).

Increase in Salmonella Stanley in Tairawhiti DHB (Source: EpiSurv, Tairawhiti DHB)

  • Tairawhiti DHB have been investigating an increase in S. Stanley.  From 01 to 29 February 2016 there have been 3 cases reported, a significant increase when compared to the same period in previous years (no cases reported previously).
  • None of the 3 cases had travelled overseas during the incubation period (all New Zealand acquired). In 2015 there were 26 cases of S. Stanley reported in New Zealand, 87.0% (20 of 23 cases with known travel history) of these were overseas acquired infections.
  • Other DHBs reporting cases of S. Stanley over the same period are: Counties Manukau (1 cases, overseas history not reported), MidCentral (1 case, New Zealand acquired) and Canterbury (1 case, travel to Thailand reported).

Increase in Salmonella Typhimurium phage type 9 in Tairawhiti DHB (Source: EpiSurv, Tairawhiti DHB)

  • Tairawhiti DHB have been investigating an increase in S. Typhimurium phage type 9.  From 01 November 2015 to 24 February 2016 there have been 12 cases reported, a significant increase when compared to the same period in previous years (1 in 2014/2015, 2 in 2013/2014).
  • 3 cases (33.3%) were hospitalised (9 had a known hospitalisation history).
  • The most common risk factors recorded in EpiSurv were consumption of untreated water (71.4%, 5/7 cases), contact with faecal matter (37.5%, 3/8), eating food from a food premise (33.3%, 3/9 cases), contact with farm animals (33.3%, 3/9 cases) and recreational water contact (33.3%, 3/9 cases).
  • Of the 12 cases reported in the past 3 months, half live remotely and half live in urban communities.
  • The ERL has confirmed this phage type in isolates from bovine, ovine, food (not specified) and poultry environment sources previously.
  • Other DHBs reporting an increase in this phage type over the same period are: Southern (5 cases compared to 1 in 2014/2015 and 2 in 2013/2014) and Auckland (4 cases compared to 2 in 2014/2015 and 0 in 2013/2014).

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:

Human Salmonella Isolates, 2016 No. 2, February

 

DOWNLOADS

Human Salmonella Isolates, 2016 No. 2, February

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