Human Salmonella Isolates, 2011
Wednesday 22nd March 2023
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Summary
There were 1095 human Salmonella isolates confirmed in 2011 (2010 n= 1195). S. Typhimurium phage type RDNC-May 06 was the predominant serotype, representing 7% of total isolates (7% 2010). Several Salmonella serotypes showed an increase this year in comparison with 2010 with the most significant increase observed in S. Enteritidis (9.5% in 2010 to 12% in 2011) and S. Typhi (2.5% in 2010 to 4% in 2011). The most significant decrease was seen in S. Typhimurium overall (from 50% in 2010 to 45% in 2011).Significant Outbreaks and/or Clusters:
S. Agona: An increase of S. Agona was detected in the Auckland region during the month of March. All cases had attended the same social function.
S. Typhimurium phage type RDNC-May 06:
In May 2006, a new S. Typhimurium RDNC (reacts with phages but does not conform to a known phage pattern) phage type pattern was confirmed in New Zealand. The pattern was designated RDNC-May 06. The first isolate was from a 3-year-old male from Auckland with no history of overseas travel. For the next 2 years, S. Typhimurium phage type RDNC-May 06 spread throughout the North Island. In June 2008, the first human case was confirmed in the South Island (a 2-year-old male from Canterbury). Since 2006, human and non-human isolates of this new phage pattern have increased in prevalence, while other phage patterns have decreased. S. Typhimurium phage type RDNC-May 06 has spread from a single location to the entire country. It peaked at 85 human cases in 2010. Seventy-three human and 42 non-human isolates were confirmed in 2011. It has established itself as a pathogen in animals, particularly cats, cattle and horses, but has not yet been confirmed in sheep. In humans, DT RDNC-May 06 is isolated most of the year, with a peak in spring.
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