Human Salmonella isolates, 2017 No.12, December

The number of isolates (n=66) confirmed this month showed an increase in comparison to the number of isolates confirmed in December 2015 (n=49). Salmonella Typhimurium phage type 56 variant (9.1% in December 2017 vs 8.2% in December 2016) were the most common serotypes confirmed this month. Uncommon Salmonella serotypes confirmed this month were S. Wandsworth (7 human isolates since it was first confirmed in New Zealand in 2001), S. Choleraesuis (10 human isolates since it was first confirmed in New Zealand in 1988) and S. Grumpensis (2 human isolates since it was first confirmed in New Zealand in 2000).