Human Salmonella Isolates, 2010 No. 7, July
Wednesday 22nd March 2023
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Summary
- The number of isolates (n=80) showed an increase in comparison with July 2009 (n = 70). Salmonella Typhimurium phage type RDNC-May 06 (11 in July 2010, 2 in July 2009) was the predominant serotype this month. Uncommon New Zealand serotypes identified this month included S. Poona (16 human isolates since 2000) and S. Typhi phage type E9 variant (4 human isolates since 2000, all with overseas travel). S. Typimurium phage type U307 was isolated for the first time in New Zealand. The case had recently travelled to New Caledonia.
- A cluster of Salmonella Newport was detected in the Auckland region (3 cases).
- Five Salmonella 4, 5,12 : i : - were confirmed in the Auckland region, including a household cluster (2 cases). The cases are currently being investigated by Auckland PHU to establish whether or not they have travelled overseas during the incubation time. Salmonella enterica serotype 4,[5],12:i:– (Salmonella 4,[5],12:i:–) is considered a monophasic variant of S. Typhimurium (4,[5],12:i:1,2) due to antigenic and genotypic similarities between the two serotypes. Overseas, the prevalence of this serotype among human salmonellosis cases has increased considerably since the mid-1990s. For further details on this serotype please refer to NZPHSR - September 2010 issue available here.
- Ten Salmonella Typimurium RDNC-May 06 isolates were confirmed this month. All but one case (AK) are children under the age of 5 years. This outbreak is currently being investigated by Auckland PHU and ESR. MLVA typing is being undertaken to establish their relatedness.
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