Reply to drs. Angulo and collignon

References 1. Davis MA, Hancock DD, Besser TE, Rice DH, Gay JM, Gay C, et. al. Changes in antimicrobial resistance among Salmonella enterica serovar Typhimurium isolates from humans and cattle in the Northwestern United States, 1982-1997. Emerg Infect Dis 1999;5:802-6. 2. Sandvang D, Aarestrup FM, Jensen LB. Characterisation of integrons and antibiotic resistance genes in Danish multiresistant Salmonella enterica Typhimurium DT104. FEMS Microbiol Let 1998;160:37-41. 3. Ridley A, Threlfall EJ. Molecular epidemiology of antibiotic resistance genes in multiresistant epidemic Salmonella typhimurium DT104. Microb Drug Resist 1998;4:113-8. 4. Briggs CE, Fratamico PM. Molecular characterization of an antibiotic resistance gene cluster of Salmonella typhimurium DT104. Antimicrob Agents Chemother 1999;43:846-9. 5. Bolton LF, Kelly LC, Lee MD, Fedorka-Cray PI, Maurer H. Detection of multidrug-resistant Salmonella enterica serotype typhimurium DT104 based on a gene which confers cross-resistance to florfenicol and chloramphenicol. J Clin Microbiol 1999;37:1348-51. 6. Zhao J, Aoki T. Nucleotide sequence analysis of the class G tetracycline resistance determinant from Vibrio anguillarum. Microbiol Immunol 1992;36:1051-60. 7. Kim EH, Aoki T. Drug resistance and broad geographical distribution of identical R plasmids of Pasteurella piscicida isolated from cultured yellowtail in Japan. Microbiol Immunol 1993;37:103-9. 8. Cohen ML, Tauxe RV. Drug-resistant Salmonella in the United States: an epidemiologic perspective. Science 1986;234:964-9. 9. Clark GM, Kaufmann AF, Gangrosa EJ. Epidemiology of an international outbreak of Salmonella agona. Lancet 1973;490-3. 10. Centers for Veterinary Medicine, U.S. Food & Drug Administration. Proposed framework for evaluating and assuring the human safety of the microbial effects of antimicrobial new animal drugs intended for use in food-producing animals. Washington: FDA; 1999 Jan 6. Available from: URL:http//www.fda.gov/ cvm/fda/infores/vmac/antim18.htm