Board E04a

Characterization of Salmonella Obtained from Animal Derived Dog Treats in the United States
D.G. White1*, S. Zhao1, A. Datta2, S. Friedman1,S.D. McDermott1, P.F. McDermott1, L. English1, S. Ayers1, and R.D. Walker1, 1DAFM, OR, CVM, FDA, Laurel, MD, and 2DFS, ORA, FDA, Rockville, MD

Dried pig ear dog treats have been implicated in human salmonellosis cases in Canada. To determine whether similar pet treats available in the U.S. were also contaminated, one-hundred and fifty-eight, randomly sampled, imported dog treats made from dried pig ears and other animal parts, were assayed for Salmonella. Forty-nine percent (n=78) of dog treat samples were positive for Salmonella. Twenty-seven different Salmonella serotypes were recovered including Anatum (n=10), Typhimurium (n=7), and Infantis (n=7). The majority of Salmonella isolates were susceptible to the 17 antimicrobials tested, however, resistance was observed to tetracycline (26 %), streptomycin (23 %), sulfamethoxazole (19 %), and chloramphenicol (8 %). Twenty-eight Salmonella isolates were resistant to at least one antimicrobial, whereas 10 isolates displayed resistance to 4 antimicrobials.Two S. Typhimurium DT104 isolates displayed the characteristic penta-resistance phenotype (ACSSuT). One isolate (S. Brandenburg) was resistant to 8 antimicrobials including ampicillin, chloramphenicol, streptomycin, sulfamethoxazole, tetracycline, cephalothin, gentamicin, and apramycin. Salmonella isolates were further screened for the presence of class 1 integrons via PCR. While the majority of Salmonella isolates assayed did not contain class 1 integrons, three Salmonella isolates displaying resistance patterns of ACSSuT or KACSSuT possessed two chromosomal integrons of 1 and 1.2 kb. In conclusion, this study indicates that animal derived dog treats available in the U.S. are a potential source of animal and human salmonella infections.


2001 FDA Science Forum | FDA Chapter, Sigma Xi | CFSAN | FDA
Last updated on 2001-JAN-15 by frf