Microbial contamination occurring on lamb carcasses processed in the United States

Area of Science:

• Food Microbiology
• Meat Science
• Food Safety

Background:

• Microbiological contamination of meat products is a significant concern for public health and the food industry.
• Establishing baseline data for microbial incidence and populations is crucial for developing effective food safety regulations and industry practices.

Purpose of the Study:

• To develop a microbiological baseline for the incidence of Salmonella spp. and populations of Escherichia coli, aerobic plate counts (APC), and total coliform counts (TCC) on U.S. lamb carcasses.
• To determine the incidence of Campylobacter jejuni/coli on lamb carcasses during processing and chilling.

Main Methods:

• Sponge-sampling of 300 cm2 surface area on lamb carcasses (flank, breast, leg) from six major U.S. packing facilities over two seasons (fall/winter, spring).
• Analysis for Salmonella spp., E. coli, APC, TCC, and C. jejuni/coli incidence.
• Samples collected after 24 hours of chilling post-slaughter.

Main Results:

• Salmonella spp. incidence was 1.5% overall (1.9% fall/winter, 1.2% spring).
• Mean log CFU/cm2 counts for APC, TCC, and E. coli on chilled carcasses were 4.42, 1.18, and 0.70, respectively.
• Campylobacter jejuni/coli incidence was very low at 0.3% (7/2,226 samples).

Conclusions:

• The study provides essential microbiological baseline data for the U.S. lamb industry and regulatory bodies.
• Low incidence rates for key pathogens suggest current practices may be effective, but ongoing monitoring is recommended.
• Findings support the development of new regulatory requirements for meat inspection and food safety in lamb processing.