Table 1.

Percentage of NG Isolates That Have Etest AST Results Within 1 Doubling Dilution of Agar Dilution Susceptibility Testing Results, by Antimicrobial and MIC, SURRG, 2017–2019

Agar Dilution MIC (μg/mL)	CRO*		CFX*		AZM†
	No. Isolates‡	% Agreement§	No. Isolates	% Agreement	No. Isolates	% Agreement
0.001	250	ND	0	ND	0	ND
0.002	435	ND	150	ND	0	ND
0.004	2323	ND	483	ND	0	ND
0.008	5418	ND	2405	ND	14	ND
0.016	3006	97	5700	96	60	63
0.032	1283	93	3080	99	416	81
0.064	279	89	874	78	1054	88
0.125	30	83	285	87	3397	94
0.25	1	0	44	86	4601	98
0.5	0	ND	4	75	1419	95
1.0	0	ND	0	ND	1075	95
2.0	0	ND	0	ND	798	99
4.0	0	ND	0	ND	65	94
8.0	0	ND	0	ND	44	93
16.0	0	ND	0	ND	85	94

^*Lower limit of CRO and CFX Etest MIC = 0.016 μg/mL.

^†Upper limit of AZM Etest MIC = 250 μg/mL. Concurrence with agar dilution result defined as MIC ≥16 μg/mL.

^‡Restricted to isolates with agar dilution MIC and corresponding Etest MIC.

^§Percentage of isolates with concurrent Etest MIC (±1 doubling dilution of agar dilution MIC). ND, not determined.