TABLE 2

Identification confidence level of isolates as determined by API-20E enterobacterial identification strips, stratified by isolate source

Isolate sourceNo. of isolatesNo. (%) of isolates at each confidence levelNo. (%) of isolates identified to genus levelNo. (%) of isolates that were not E. coli
Excellent (≥99.9%)Very good (99.0–99.8%)Good (90.0–98.9%)Acceptable (80.0–89.9%)Low
Fecal composites9210 (11)52 (57)16 (17)0 (0)5 (8)7 (5)2 (2)
    Cattle326 (19)16 (50)5 (16)0 (0)4 (13)0 (0)1 (3)
    Chicken321 (3)21 (66)6 (19)0 (0)3 (9)0 (0)1 (3)
    Human283 (11)15 (54)5 (18)0 (0)0 (0)5 (18)0 (0)
Hand9521 (22)48 (51)17 (18)0 (0)0 (8)8 (0)1 (1)
Soil9512 (13)56 (59)17 (18)1 (1)7 (7)2 (2)0 (0)
Total28243 (15)156 (55)50 (18)1 (0)7 (8)22 (2)4 (1)