Non-Human Salmonella Isolates, 2013

Monday 23rd September 2019


Summary

The Enteric Reference Laboratory confirmed 967 non-human Salmonella isolates in 2013 compared with 1021 in 2012.

There was a decrease in the number of bovine isolates (39.7% in 2012 vs. 31.9% in 2013), in meat/bone meal isolates (9.8% in 2012 vs. 8.4% in 2013) and food isolates (7.9% in 2012 vs. 6.9% in 2013).

A few serotypes showed an increase this year in comparison to 2012 and included: S. Agona (2.6% to 4.3%), S. Anatum (1.0% to 2.9%), S. Bovismorbificans (0.3% to 1.5%), S. Brandenburg (11.1% to 20.4%), S. Montevideo (1.8% to 3.0%), and S. Typhimurium phage type 9 (0.9% to 4.0%).

The number of Salmonella isolates from feline, environmental and poultry environmental source showed an increased this year in comparison to 2012.
- The increase of 2.8% in feline isolates was linked to the increase in S. Typhimurium phage type 56 variant reported during the month of July. An increase was also confirmed in human isolates where 16 isolates of S. Typhimurium phage type 56 variant were confirmed during July in comparison to 6 during the same period last year.
- The increase of 4.8% in environmental isolates was linked to the increase of S. Brandenburg and S. Anatum confirmed this year.

Salmonella Typhimurium phage type 56 variant
Salmonella Typhimurium phage type 56 variant was previously known as S. Typhimurium phage type RDNC-May 06. Further characterisation by the Salmonella Reference Unit at Colindale (Public Health England) identified this phage type to be a 56 variant. July

S. Mbandaka
There was an increase during the month of January in S.  Mbandaka isolates due to an outbreak linked to the consumption of contaminated tahini at the end of 2012. S. Mbandaka was isolated from the tahini resulting in a product recall (http://www.surv.esr.cri.nz/enteric_reference/human_salmonella.php?we_objectID=3266).

S. Hindmarsh
An outbreak of Salmonella Hindmarsh in sheep was reported in Southland during May this year (http://www.3news.co.nz/Salmonella-outbreak-kills-hundreds-of-sheep/tabid/423/articleID/298018/Default.aspx). 

S. Brandenburg
There was an increase in the number of ovine S. Brandenburg isolates during the month of August. Occurrence of S. Brandenburg infection in humans is a seasonal phenomenon in the southern half of the South Island (Baker et al Epidemiol Infect 2007; 135:76-83) and is often linked with occurrence of the serotype in livestock. Salmonella Brandenburg has caused periodic epidemics of disease in sheep flocks in Otago and Southland since 1997.
See also: http://www.stuff.co.nz/business/farming/sheep/9090477/Bacterial-outbreak-killing-South-Island-sheep.

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Non-Human Salmonella Isolates, 2013

 

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Non-Human Salmonella Isolates, 2013

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