Occurrence of Salmonella spp. and generic Escherichia coli on beef carcasses sampled at a brazilian slaughterhouse

Brazilian Journal of Microbiology

Fabiana Fernanda Pacheco Da Silva¹  Mariana Bandeira Horvath¹  Juliana Guedes Silveira¹  Luiza Pieta¹  Eduardo Cesar Tondo¹ 

[1] ,Universidade Federal do Rio Grande do Sul Instituto de Ciência e Tecnologia de Alimento Laboratório de Microbiologia e Controle de AlimentosPorto Alegre RS ,Brazil

关键词: Salmonella;    E. coli;    beef carcasses;    slaughter line;    antimicrobial susceptibility;   

DOI  :  10.1590/S1517-83822014005000037

来源: SciELO

【 摘 要 】

A total of 120 beef carcasses were analyzed during processing at a slaughterhouse in southern Brazil. The carcasses were sampled by swab at three different steps of the slaughter line and then they were tested for Salmonella and E. coli. The Salmonella isolates were also examined for antimicrobial susceptibility. Salmonella prevalence distribution was modeled and the probability of contamination was simulated using @Risk program and 10,000 interactions. Results demonstrated that 4 beef carcasses (3.3%) were positive for Salmonella only in the first point. The six isolates of Salmonella were classified: S. Newport (n = 3), S. Saintpaul (n = 2) and S. Anatum (n = 1). No Salmonella strains exhibited resistance to any of the antimicrobials tested. As expected, the most contaminated point with E. coli was the first point (hide), presenting counts from 0.31 to 5.07 log cfu/100 cm². Much smaller E. coli counts were observed in the other points. Results indicated low levels of Salmonella and E. coli on the beef carcasses analyzed and also low probability of contamination of the carcasses by Salmonella, suggesting adequate microbiological quality.

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