Table 2.

Summary statistics of the numbers of presumptive E. coli organisms isolated from different animal species from CHROMagar ECC and CHROMagar CTX agar medium

StatisticNo. of E. coli organisms (CFU/g) isolated from:
Cattle feces (n = 35)Chicken cecal contents (n = 32)Pig feces (n = 20)
ECCaCTXbECCCTXECCCTX
Minimum6 × 1041008 × 1041001 × 106100
25th percentile9 × 1051004.2 × 1062503 × 106100
Mean2.8 × 1088.6 × 1041.2 × 1082.1 × 1051.1 × 1071.0 × 105
Median1.8 × 1061003.5 × 1075,3507.5 × 1062,800
75th percentile7 × 1061,0008.05 × 1071.75 × 1051 × 1071.95 × 105
Maximum4.9 × 1091 × 1061 × 1093.1 × 1064.4 × 1074.7 × 105
SD1.1 × 1092.8 × 1052.5 × 1085.7 × 1051.2 × 1071.6 × 105
  • a ECC, CHROMagar ECC.

  • b CTX, CHROMagar CTX.