Human Salmonella Isolates, 2015 No. 4, April

The number of isolates (n=112) confirmed this month showed an increase in comparison to the number of isolates confirmed in April 2014 (n=63). Salmonella Enteritidis phage type 11 (12.5% in April 2015 vs. 9.5% in April 2014) was the most common serotype confirmed this month. Uncommon Salmonella serotypes confirmed this month included S. Victoria (53 human cases since it was first confirmed in 1989).

Increase in Salmonella Enteritidis phage type 11 (Source: EpiSurv, ERL)

• From 01 April to 12 May 2015 there have been 14 cases of S. Enteritidis phage type 11 reported to EpiSurv. This is an increase compared to the same period in the previous two years (7 in 2014 and 1 in 2013) but similar to what was observed in 2012 (11 cases) and 2011 (12 cases). Prior to 2012 S. Enteritidis phage type 11 was known as phage type 9a.

• Cases were reported from the following DHBs: MidCentral (3 cases), Waikato and Nelson Marlborough (2 cases each), Northland, Waitemata, Bay of Plenty, Whanganui, Hutt Valley, Canterbury and Southern (1 case each).