Human Salmonella Isolates, 2013 No. 5, May
Wednesday 22nd March 2023
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Summary
The number of isolates this month (n=108) showed a slight increase in comparison with May 2012 (n = 97). Salmonella Infantis (3.0% in May 2012 and 14.8% in May 2013) was the predominant serotype. Uncommon Salmonella serotypes confirmed this month included S. Kiambu (13 human isolates confirmed since 1996), S. Mgulani (7 human isolates confirmed since 1996), S. Okatie ( 1 human isolate confirmed in 2004), and S. Rubislaw (3 human isolates confirmed since 1996). Salmonella Blockey was confirmed for the first time in New Zealand (no recent overseas travel reported).S. Infantis cluster (ongoing)
Ongoing increase in S. Infantis is still being reported in the Northland and Auckland DHBs. PFGE analysis was performed on the human isolates as well as a S.Infantis isolated from an ham and egg sandwich. The results indicated that the Northland cases and the ham and egg sandwich from the implicated premises have an indistinguishable PFGE profile, suggesting a common source outbreak. The recent Auckland cases although similar, are distinguishable from the Northland cluster.
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