Evaluation of Petrifilm™ Select E. coli Count Plate medium to discriminate antimicrobial resistant Escherichia coli

Table 2 Agreements of MIC values obtained by susceptibility testing Escherichia coli strains on SEC and Mueller Hinton II agar plate media.

Antimicrobial agent	No. of E. coli	Exact agreement		Within ± 1 dilution		Within ± 2 dilutions		Kappa value^a
		No.	%	No.	%	No.	%
Ampicillin	16	10	63	16	100	16	100	0.92
Cephalothin	15	4	17	11	73	14	93	0.67
Chloramphenicol	15	11	73	15	100	15	100	0.92
Gentamicin	14	7	50	14	100	14	100	0.93
Streptomycin	15	5	33	13	87	15	100	0.74
Cefotaxime	17	8	47	17	100	17	100	0.90
Oxytetracycline	22	0	0	3	14	11	50	0.48
Sulphamethoxazole	15	7	47	7	47	7	47	0.47

^a The kappa value indicates the level of agreement between MIC values obtained by SEC and Mueller Hinton II agar plate media as follows: < 0.2, slight agreement; 0.2–0.4, fair agreement; 0.4–0.6, moderate agreement; 0.6–0.8, substantial agreement; > 0.8, almost perfect agreement.

ISSN: 1751-0147