Salmonella spp. Shedding by Alberta Beef Cattle and the Detection of Salmonella spp. in Ground Beef

Abstract

Breeder cows, cattle recently arrived at feedlots, and cattle about to be shipped for slaughter were tested for Salmonella spp. No Salmonella spp. were detected in fecal samples from breeding cows. Nineteen of 1,000 (1.9%) fecal samples from recently arrived feedlot cattle were positive for Salmonella spp. compared to only 2 of 1,000 (0.2%) fecal samples taken within 2 weeks of slaughter. The positive fecal samples were collected in 5 of 50 (10%) "recent arrival" pens tested and in 1 of 50 (2%) pens tested within 2 weeks of slaughter. The serotypes isolated were Salmonella Agona, Salmonella Enteritidis, Salmonella Typhimurium DT104, and Salmonella 4,5,12:i:-. Ground beef samples purchased from retail outlets throughout Alberta were processed for Salmonella spp. Thirteen of 1,002 (1.3%) samples were positive for Salmonella spp. The serotypes isolated from ground beef were Salmonella Anatum, Salmonella Heidelberg, Salmonella Montevideo, Salmonella Typhimurium, Salmonella Typhimurium var. Copenhagen, and Salmonella Rough-O:i:1,2. The antibiotic resistance and pulsed-field electrophoresis gel macrorestriction patterns of all isolates were compared.

Microbiological Characterization of Imported and Domestic Boneless Beef Trim Used for Ground Beef

“…According to the USDA National Animal Health Monitoring System, Salmonella Montevideo was one of the five serotypes most frequently shed by feedlot cattle (49), and Salmonella Anatum was one of the five serotypes most frequently shed by dairy cattle (48,50). Salmonella Enteritidis is usually associated with eggs and poultry and is uncommon in cattle (42).…”

Prevalence of Shiga Toxin–producing Escherichia Coli and Salmonella Enterica in Rock Pigeons Captured in Fort Collins, Colorado

“…Although no other serotypes were detected in pigeon and multiple environ-mental sample types, serotypes frequently implicated as the cause of disease were identified in the environmental samples. Salmonella Anatum and Salmonella Newport, which were isolated from the feed and manure samples respectively, are two of the most commonly detected serotypes in cattle (Smith and House, 1992;Sorenson et al, 2002). Salmonella Mbandaka, which was detected in a feed sample during the summer trapping period, is less frequently reported in cattle (CDC, 2004).…”

Antimicrobial Drug Resistance and Molecular Characterization of Salmonella Isolated from Domestic Animals, Humans and Meat Products

“…For example, in 2005, the Salmonella serotypes accounting for 56% of human infections included Typhimurium (20%), Enteritidis (15%), Newport (10%), Javiana (7%), and Heidelberg (5%) (CDC, 2006). Another study found the predominant serotype to be S. typhimurium var Copenhagen (Sorensen et al, 2002). Other studies have reported the predominant serotype to be S. enteritidis (Domínguezet al, 2002;Mayrhofer et, 2004), S. bredeney (Duffy et al, 1999) and S. anatum (Mrema et al, 2006).…”