Microbial profiles of carcasses and minced meat from kangaroos processed in South Australia
2008
Holds, Geoff | Pointon, Andrew | Lorimer, Michelle | Kiermeier, Andreas | Raven, Geoff | Sumner, John
The microbiological profiles of kangaroo carcasses and minced meat at game meat processing plants in South Australia were determined in surveys undertaken in 2002 and 2004. In 2002 mean values for log₁₀ total viable counts (TVC) on carcasses at individual plants ranged from 0.9 to 3.9 log₁₀ cfu/cm², with the mean for all plants being 2.3 log₁₀ cfu/cm². In 2004 the between plant range was narrower, by about 1 log unit, and the mean value for carcasses at all plants was 1.2 log₁₀ cfu/cm². Minced kangaroo meat, was sampled in 2002 only. The overall mean log₁₀ TVC was 3.9 log₁₀ cfu/g, with mean counts at individual plants ranging from 3.1 to 4.6 log₁₀ cfu/g. The overall prevalence of E. coli was 70%, with mean numbers of 2.1 log₁₀ cfu/g on positive samples. Salmonella was not detected in any of 60 samples from carcasses in 2002. However, in 2004 Salmonella was detected in 4/385 samples (1.04%, 95% CI: 0.28%-2.64%). In minced kangaroo meat, Salmonella was detected in 9/50 (18%, 95% CI: 9%-31%) samples. The abdominal cavity, sampled in 2004, was found to be highly contaminated, with E. coli isolated from 46% of samples and the mean number for positive samples being 2.7 log₁₀ cfu/cm²; Salmonella was isolated from 14/120 (12%; 95% CI: 6.52%-18.80%) of abdominal cavities. The practice of collecting carcasses together and pushing grouped carcasses into the chiller likely leads to cross contamination of carcasses from the abdominal cavities of others. To align results of sampling by swabbing for domestic purposes with excision sampling, required for export purposes, both methods were used to sample opposite sides of each of the 50 carcasses sampled in 2004. The results obtained with the two methods of sampling were similar.
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