Human Salmonella Isolates, 2011 No. 9, September
Wednesday 22nd March 2023
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Summary
The number of isolates (n=74) showed a decrease in comparison with September 2010 (n = 129). Salmonella Brandenburg (7.8% in September 2010, 12% in September 2011) was the predominant serotype. Salmonella Enteritidis phage type 60 was isolated for the first time in New Zealand (recent overseas travel). During the month of August and September 2010, the Enteric Reference Laboratory confirmed 66 and 12 ovine isolates of S. Brandenburg from the South Island, respectively. This year, 11 ovine isolates were confirmed in August and 28 in September. A delay in human cases of S. Brandenburg has been observed since 1998, with human cases usually increasing in September and October. However this year this increase might be further delayed. In August 2011, 1 human isolate of S. Brandenburg was confirmed in the South Island (6 in 2010) and 9 were confirmed in September (9 in 2010).
S. Typhimurium phage type 135 variant has 3 phage typing reactions which are distinct from our DT135. This phage type has also been confirmed this year from bovine isolates in the North Island. All cases had contact with calves.
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