Human Salmonella Isolates, 2013 No. 7, July
Wednesday 22nd March 2023
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Summary
The number of isolates this month (n=78) showed a slight increase in comparison with July 2012 (n = 71). Salmonella Typhimurium phage type 56 variant (8.5% in July 2012 and 20.5% in July 2013) was the predominant serotype. The S. Typhimurium phage type 56 variant was known as S. Typhimurium phage type RDNC-May06 prior to July 2013. Further characterisation work undertaken by the Salmonella Reference Unit at Colindale (Public Health England) identified this phage type as 56 variant.Uncommon Salmonella serotypes confirmed this month included S. Brado (3 human isolates confirmed since 1996), S. Kedougou (9 human isolates since 1996), and S. Singapore (9 human isolates confirmed since 2002). Salmonella Enteritidis phage type 6c was confirmed for the first time in New Zealand.
Increase in S. Typhimurium phage type 56 variant
This month, 16 isolates of S. Typhimurium phage type 56 variant were confirmed. This compares with 6 human isolates confirmed during the same period last year.
An increase in this phage type has also been confirmed in animal isolates. Since 01 July 2013, 29 animal isolates have been confirmed (compared to 3 for the same period last year). 15/23 were isolated from cats and 9/23 from horses.
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