Human Salmonella Isolates, 2013 No. 9, September

Wednesday 22nd March 2023


The number of isolates this month (n=91) showed a slight decrease in comparison to the number of isolates received in September 2012 (n=95). Salmonella Brandenburg (6.3% in September 2012 and 13.2% in September 2013) was the predominant serotype. Uncommon serotypes confirmed this month included Salmonella Typhimurium phage type 40 ( 12 human isolates since 2002). Salmonella Enteritidis phage type 5c and S. Typhimurium phage type 90 were confirmed for the first time in New Zealand.

The S. Typhimurium phage type 56 variant was known as S. Typhimurium phage type RDNC-May06 prior to July 2013. Further characterisation work undertaken by the Salmonella Reference Unit at Colindale (Public Health England) identified this phage type as 56 variant.

Increase in Salmonella Brandenburg-update

  • This month, Enteric Reference Laboratory (ERL) confirmed 12 isolates of Salmonella Brandenburg from the following DHBs : Southern (7 cases), Canterbury (3 cases), Taranaki and Waikato (1 case each). This compares with 6 isolates confirmed during the same period last year.
  • Occurrence of S. Brandenburg infection in humans is a seasonal phenomenon in the southern half of the South Island and is often linked with occurrence of the serotype in livestock.
  • An increase in S. Brandenburg confirmed from animal sources has been observed since July (see PH AIDE 28 August 2013).

Increase in Salmonella Enteritidis

  • This month, ERL confirmed 15 isolates of S. Enteritidis of various phage types. This compares with 6 cases confirmed during the same period last year. The majority of cases have been reported from the Auckland region (7cases).
  • 40% (6/15 cases) reported recent overseas travel.

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Human Salmonella Isolates, 2013 No. 9, September



Human Salmonella Isolates, 2013 No. 9, September

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