Table 3.: Identification (ID) Codes and Responses of Isolates Identified as E. coli based on the API 20E and Enterotube II Test Systems

ID Codea   Test resultb
API 20E Entero-tube II Number of Isolates (% of 45 Total) ONPG ADH LDC ODC CIT H2S URE TDA IND VP GEL GLU MAN INO SOR RHA SAC MEL AMY ARA GAS ADO DUL PHE LAC
5144572 19 (42.2) + - + + - - - - + - - + + - + + + + - +
5144552 10 (22.2) + - + + - - - - + - - + + - + + - + - +
4144572 5 (11.1) - - + + - - - - + - - + + - + + + + - +
5044552 4 (8.8) + - + - - - - - + - - + + - + + - + - +
5044572 2 (4.4) + - + - - - - - + - - + + - + + + + - +
5144472 1 (2.2) + - + + - - - - + - - + - - + + + + - +
5144562 1 (2.2) + - + + - - - - + - - + + - + - + + - +
1044552 1 (2.2) + - - - - - - - + - - + + - + + - + - +
0044552 1 (2.2) - - - - - - - - + - - + + - + + - + - +
5044542 1 (2.2) + - + - - - - - + - - + + - + - - + - +
5144552c E. coli ATCC 25922 + - + + - - - - + - - + + - + + - + - +
36560 20 (44.4) + + - - - + + + + + - - - +
36570 7 (15.6) + + - - - + + + + + - + - +
26570 5 (11.1) + + - - - + + + + - - + - +
26560 4 (8.8) + + - - - + + + + - - - - +
34570 3 (6.7) + - - - - + + + + + - + - +
34560 2 (4.4) + - - - - + + + + + - - - +
24560 1 (2.2) + - - - - + + + + - - - - +
34760 1 (2.2) + - - - - + + + + + + - - +
30560 1 (2.2) - - - - - + + + + + - - - +
30570 1 (2.2) - - - - - + + + + + - + - +
36560c E. coli ATCC 25922 + + - - - + + + + + - - - +

a All codes listed identified isolates as E. coli.
b Biochemical tests: ONPG, 2-nitrophenyl-β-D-galactopyranoside to detect β-galactosidase; ADH, arginine dihydrolase; LDC, lysine decarboxylase; ODC, ornithine decarboxylase; CIT, citrate utilization; H2S, H2S production; URE, urease; TDA, tryptophan deaminase; IND, indole production; VP, Voges-Proskauer test for acetoin; GEL, gelatinase; GLU, glucose fermentation; MAN, mannitol fermentation; INO, inositol fermentation; SOR, sorbitol fermentation; RHA, rhamnose fermentation; SAC, saccharose (sucrose) fermentation; MEL, melibiose fermentation; AMY, amygdalin fermentation; ARA, arabinose fermentation; GAS, gas production; ADO, adonitol fermentation; DUL, dulcitol fermentation; PHE, phenylalanine deaminase; LAC, lactose fermentation. Red shaded areas indicate tests that were different from E. coli ATCC 25922, the control (reference) strain.
c API 20E and Enterotube II test results for E. coli ATCC 25922.