Table 1.

Sample pool of pentaresistant S. typhimurium isolates submitted in 1998 to the National Veterinary Services Laboratory in Ames, Iowa

RegionaPhage typebNo. of isolates from:No. of companion isolatesTotal no. of isolates
RuminantsSwineNonclinical sourcesBirds
EasternDT10424489224107
U30221223019
DT193700108
DT208100012
DT120030104
Subtotal346311275140
MiddleDT10442473348134
U30216491131
DT1934015010
DT2089100010
DT120211004
Subtotal735344109189
WesternDT104212250856
U302003003
DT1932090112
DT208100001
DT120000000
Subtotal242370972
UnclassifiedcDT10411130015
U302001001
DT193003003
DT208000000
DT120101002
Subtotal21180021
Total1331191103723422
  • a The eastern, middle, and western regions are described in the text.

  • b A total of 315, 54, 33, 13, and 10 isolates belonged to phage types DT104, U302, DT193, DT208, and DT120, respectively.

  • c The states from which the isolates were obtained were not identified; 18 strains were from the FSIS, two strains were from foreign sources, and the origin of one strain was not recorded.