Human Salmonella Isolates, 2015 No. 10, October

Saturday 21st September 2019


Summary

The number of isolates (n=101) confirmed this month showed an increase in comparison to the number of isolates confirmed in October 2014 (n=91). Salmonella Typhimurium phage type 135 (1.1% in October 2014 vs 20.8% in October 2015) was the most common serotype confirmed this month. Uncommon Salmonella serotypes confirmed this month included S. Alachua (9 human isolates since it was first confirmed in New Zealand in 1990), Isangi (16 human isolates since it was first confirmed in New Zealand in 1990) and S. Typhimurium phage type 208 (5 human isolates since it was first confirmed in New Zealand in 1995). Salmonella Napoli was confirmed for the first time in New Zealand this month; the case had recently travelled to the Czech Republic.

Increase in Salmonella Typhimurium phage type 135 cases in Southern DHB (Source: Public Health South)

  • During the month of November, there have been 21 cases of Salmonella Typhimurium phage type 135 confirmed by ERL in Southern DHB. This is an increase compared to the same period in 2014  (1 in 2014).
  • Multiple Locus Variable-number tandem repeat Analysis (MLVA) analysis has been performed on the 21 cases: 8 share profile EU 2-11-9-13-0212 and 8 share profile EU 2-10-10-13-0212, the remaining 5 cases have profiles with 1 or 2 variations from the two common profiles in this outbreak.
  • Public Health South is actively investigating the cases. To date, no common risk factors or exposures have been identified. A shotgun questionnaire focussed on lifestyle and activities, food exposures and local food sources is now being administered for hypothesis generation.

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Human Salmonella Isolates, 2015 No. 10, October

 

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Human Salmonella Isolates, 2015 No. 10, October

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