Table 2.

Sensitivity and specificity of genotype predictions of resistant antimicrobial phenotype for E. coli isolates by time point and treatment group for CTX-M and bla-TEM genes. 1. Time point in days when sample was collected; 2. Treatment group; 3. Number of isolates from each treatment group for each sampling time point; 4. Number of isolates for which both the referred antimicrobial resistance gene and corresponding resistance phenotype were observed; 5. Number of isolates for which the referred antimicrobial resistance gene was not detected, but the expected corresponding resistance phenotype were observed; 6. Number of isolates for which the referred antimicrobial resistance gene was detected, but the expected corresponding resistance phenotype was not observed; 7. Number of isolates for which both the referred antimicrobial resistance gene and corresponding resistance phenotype were not observed; 8. Sensitivity for the referred resistance gene to correctly predict phenotypic resistance to the corresponding antimicrobial drug; 9. Specificity for the absence of the referred resistance gene and prediction of lack of phenotypic resistance to the corresponding antimicrobial drug.

Time point1	Tx group2	N° isolates3	CTX-M						bla-TEM
			G+: P+4	G−: P+5	G+: P−6	G−: P−7	Se8	Sp9	G+: P+4	G−: P+5	G+: P−6	G−: P−7	Se8	Sp9
0	CTL	21	3	13	0	5	18.8	100	21	0	0	0	100	−
	ENR	22	1	20	0	1	4.8	100	22	0	0	0	100	−
	TUL	24	0	22	0	2	0.0	100	24	0	0	0	100	−
7	CTL	21	4	13	0	4	23.5	100	21	0	0	0	100	−
	ENR	22	6	9	0	7	40.0	100	21	0	1	0	100	0.0
	TUL	24	5	15	0	4	25.0	100	24	0	0	0	100	−
28	CTL	21	4	16	0	1	20.0	100	21	0	0	0	100	−
	ENR	22	7	10	0	5	41.2	100	21	0	1	0	100	0.0
	TUL	24	8	12	0	4	40.0	100	24	0	0	0	100	−
56	CTL	20	3	15	0	2	16.7	100	20	0	0	0	100	−
	ENR	20	5	14	0	1	26.3	100	19	0	1	0	100	0.0
	TUL	23	5	13	0	5	27.8	100	20	0	3	0	100	0.0