Human Salmonella Isolates, 2012 No. 11, November

Monday 23rd September 2019


Summary

The number of isolates (n=104) showed an increase in comparison with November 2011 (n = 81). Salmonella Typhimurium phage type RDNC-May 06 (8.6% in November 2011 and 10.6% in November 2012) and S. Montevideo ( 0% in November 2011 and 10.6% in November 2012) were the predominant serotypes. Uncommon Salmonella serotypes confirmed this month included: S. Enteritidis phage type 15 (2 human isolates since 1988) and S. Johannesburg (12 human isolates since 1988). Salmonella Maastricht and S. Enteritidis phage type 12 variant were isolated for the first time in New Zealand (no overseas travel reported). One isolate of S. Enteritidis phage type 12 (related to S. Enteritidis phage type 12 variant) was confirmed in 2011 from food.

Salmonella
Montevideo outbreak:

·    This month, ERL confirmed 11 cases of S. Montevideo (compared to 0 cases this time last year). The 11 cases were distributed as follows: TG (4 cases), AK (3 cases), BP, WK, HB and NM DHBs (1 case each).
·    Six non-human isolates of S. Montevideo were confirmed from meat/bone meal in March 2012 and one from bovine in February 2012.
·    Pulse field gel electrophoresis was performed on 9/11 human isolates and a selection of non-human isolates confirmed in the last year. Four different profiles were identified. Seven cases (from Auckland, Waikato, Bay of Plenty, and Hawke’s Bay DHBs) had an indistinguishable profile. This profile is distinguishable from the profile of the meat/bone meal and poultry feed isolates. One case from Counties Manukau and one from Nelson Marlborough DHBs each had unique profiles.
·    Investigations into the cluster are on-going.

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Human Salmonella Isolates, 2012 No. 11, November

 

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Human Salmonella Isolates, 2012 No. 11, November

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