Table 1.

Origin and characterization of multidrug-resistantS. enterica serovar Typhimurium DT104 isolates from Danish herds

Herd no.No. of isolatesPeriod of isolation (mo.day.yr)Source(s)Characterization of the herd typeaStability of the herd type
HMb11991PigResistance profile, AmChSpStSuTe; PFGE profile, XbaI type I andBlnI type I; plasmid profile (approx. kb), 95, 2.2
HM11994PigResistance profile, SpStSu; PFGE profile,XbaI type I and BlnI type I; plasmid profile (approx. kb), 95
HM11994PigResistance profile, sensitive; PFGE profile, XbaI type I and BlnI type IV; plasmid profile (approx. kb): 95
HM11995PigResistance profile, sensitive; PFGE profile, XbaI type I and BlnI type IV; plasmid profile (approx. kb), 95
14111.20.96–9.10.97PigsResistance profile, AmChSpStSuTe; PFGE profile, XbaI type I and BlnI type I; plasmid profile (approx. kb), 95One of 41 isolates had SpStSu resistance profile One of 41 isolates wasBlnI type III
247.5.96–9.17.97PigsResistance profile, AmChSpStSuTe; PFGE profile XbaI type I andBlnI type I; plasmid profile (approx. kb), 95 and 2.2No variations in four isolates
321.19.96–5.9.97Calf, pigResistance profile, AmChSpStSuTe; PFGE profile, XbaI type I and BlnI type I; plasmid profile (approx. kb), 95No variations in two isolates
428.6.96–5.12.97PigsResistance profile, AmChSpStSuTe; PFGE profile, XbaI type I and BlnI type I; plasmid profile (approx. kb), 95No variations in two isolates
5203.10.97–11.7.97Pigs, dog, environmentResistance profile, AmChSpStSuTe; PFGE profile,XbaI type I and BlnI type I; plasmid profile (approx. kb), 95 and 6.8No variations in isolates from pigs or the environment One isolate from a dog withBlnI type X and plasmid profile of fragments of 115, 90, 4.4, and 3.0 kb
61410.31.97–12.19.97Pigs, cattleResistance profile, AmChSpStSuTe; PFGE profile,XbaI type I and BlnI type V; plasmid profile (approx. kb), 95No variations in 14 isolates
711.7.98PigResistance profile, AmChSpStSuTe; PFGE profile, XbaI type I and BlnI type I; plasmid profile (approx. kb), 95
861.9.98–1.23.98Pigs, dogResistance profile, AmChSpStSuTe; PFGE profile, XbaI type I and BlnI type I; plasmid profile (approx. kb), 95Two isolates with SpStSu resistance profile
9312.1.97–12.22.97PigsResistance profile, AmChSpStSuTe; PFGE profile, XbaI type I and BlnI type I; plasmid profile (approx. kb), 95One isolate wasXbaI type V
  • a Herd type is defined as the type most frequently isolated from the herd.

  • b HM, historical material for comparison.