TABLE 3.

E. coli O157 in GIT compartments of steers

Day postinoculationaNo. of E. coli O157 CFU/g of digesta fromd:
RumenDuodenumFeces
A1A2A3A4A1A2A3A4A1A2A3A4
0000000000000
0.04 (1 h)3.2 × 1044.6 × 1041.3 × 1053.9 × 104E+E+E+1.9 × 103NDNDNDND
0.08 (2 h)3.9 × 1046.3 × 1048.6 × 1041.3 × 104E+1.0 × 1021.3 × 1030NDNDNDND
0.17 (4 h)3.1 × 1032.4 × 1032.5 × 1047.5 × 104E+E+5.0 × 1035.0 × 101NDNDNDND
0.25 (6 h)2.4 × 1033.0 × 1032.2 × 1041.0 × 103E+E+6.9 × 103E+E+0E+7.5 × 103
14.3 × 1033.7 × 1033.5 × 1033.7 × 103E+E+E+4.0 × 1023.0 × 1041.9 × 1041.6 × 1051.1 × 104
2E+bE+5.0 × 101E+E+E+E+02.5 × 1023.6 × 1031.3 × 1042.5 × 103
3E+E+0E+0E+E+07.0 × 1034.7 × 1033.1 × 1034.6 × 103
7000000E+03.7 × 103E+2.0 × 1022.0 × 102
10E+E+E+E+00NDc0E+0E+E+
140000000000E+0
160E+00000000ND0
2100000000E+000
24ND0NDNDNDNDNDNDE+ND0ND
27000000000000
3400000000E+0E+0
  • a Angus steers with rumenal and duodenal cannulas were given a single dose of 2×1011 CFU E. coli O157:H7 ATCC 43894 directly into the rumen.

  • b E+, digesta sample culture positive for E. coli O157 after enrichment culture only.

  • c ND, not determined.

  • d A1, A2, etc. identify animals from which samples were taken.