TABLE 4.

Numbers of E. coli O157:H7 isolates shed in naturally infected and inoculated dairy calves housed in a confined environment

Calf no.No. of samplesaRange of CFU/g
Naturally infectedb
    16764.2 × 103-6.8 × 105
    16027.8 × 103-2.2 × 104
    15781.2 × 102-8.5 × 104
    15656.0 × 101-9.0 × 103
    470471.7 × 102-2.2 × 105
    Overall range60-6.8 × 105
Inoculatedc
    17124.3 × 102-2.1 × 105
    16525.9 × 104-1.2 × 106
    16334.7 × 102-1.6 × 103
    16131.5 × 103-3.5 × 104
    Overall range4.3 × 102-1.2 × 106
  • a Numbers of fecal samples plated to determine the number of E. coli O157:H7 CFU/g.

  • b Calves that shed E. coli O157:H7 but were not inoculated.

  • c Calves that shed E. coli O157:H7 after receiving three 1-liter doses containing 103 to 104 FRIK 1275 CFU/ml of water.