Salmonella prevalence in bovine lymph nodes differs among feedyards.
Lymphatic tissue, specifically lymph nodes, is commonly incorporated into ground beef products as a component of lean trimmings. Salmonella and other pathogenic bacteria have been identified in bovine lymph nodes, which may impact compliance with the Salmonella performance  standards for ground beef established by the U.S. Department of Agriculture. Although Salmonella prevalence has been examined among lymph nodes between animals, no data are currently available regarding feedyard origin of the cattle and Salmonella prevalence. Bovine lymph nodes  (279 superficial cervical plus 28 iliofemoral = 307) were collected from beef carcasses at a commercial beef harvest and processing plant over a 3-month period and examined for the prevalence of Salmonella. Cattle processed were from seven feedyards (A through G). Salmonella  prevalence was exceptionally low (0% of samples were positive ) in cattle from feedyard A and high (88.2%) in cattle from feedyard B. Prevalence in the remaining feedyards ranged widely: 40.0% in feedyard C, 4.0% in feedyard D, 24.0% in feedyard E, 42.9% in feedyard F, and 40.0% in feedyard  G. These data indicate the range of differences in Salmonella prevalence among feedyards. Such information may be useful for developing interventions to reduce or eliminate Salmonella from bovine lymph nodes, which would assist in the reduction of Salmonella in ground  beef.
Department of Animal Science, Texas A&M University, 2471 TAMU, College Station, Texas 77843-2471, USA.
Ashley N
AN
Haneklaus
Kerri B
KB
Harris
Davey B
DB
Griffin
Thomas S
TS
Edrington
Lisa M
LM
Lucia
Jeffrey W
JW
Savell
D000818:Animals; D002417:Cattle / Q000382:microbiology*; D015169:Colony Count, Microbial; D005506:Food Contamination / Q000032:analysis / Q000517:prevention & control*; D006801:Humans; D008198:Lymph Nodes / Q000382:microbiology*; D008461:Meat Products / Q000382:microbiology; D015995:Prevalence; D012475:Salmonella / Q000302:isolation & purification*