Table 1. Comparison of percent of Streptococcus pneumoniae isolates nonsusceptible to penicillin by site: active surveillance (ABCs) versus antibiogram.

Site	Antibiogram				ABCs
	No. laboratoriesa	Nonsusceptible isolates	Total no. isolates tested	% nonsusceptible	No. laboratories	Nonsusceptible isolates	Total no. isolates tested	% nonsusceptible	Difference in % nonsusceptible (antibiograms vs. ABCs)
Connecticut	16	168	845	19.9	32	113	624	18.1	1.8
California	9	107	577	18.5	10	30	184	16.3	2.2
Oregon	9	115	550	20.9	15	32	178	18.0	2.9
Tennessee	10	432	1,037	41.7	31	169	440	38.4	3.3
Maryland	10	171	886	19.3	27	85	557	15.3	4.0
Georgia	14	505	1,291	39.1	39	292	850	34.4	4.7
New York	9	85	383	22.2	20	10	69	14.5	7.7
Minnesota	19	315	1,037	30.4	25	95	435	21.8	8.6
Total	96	1,898	6,606	28.7	199	826	3,337	24.8	Median: 3.65

^aOnly laboratories whose antibiograms covered the calendar year in question (1997 for all sites except NY [1998]) were compared to ABCs.