Table 3. Comparison of percent of Streptococcus pneumoniae isolates nonsusceptible to erythromycin by site: active surveillance (ABCs) versus antibiogram.

Site	Antibiogram				ABCs				Difference in % nonsusceptible (antibiogram vs. ABCs)
	No. laboratories a	Non -susceptible isolates	Total. isolates tested	% non-susceptible	No. laboratories	Non-susceptible isolates	Total isolates tested	% non-susceptible
Georgia	10	178	805	22.1	39	207	850	24.4	-2.3
Tennessee	8	133	460	28.9	31	113	440	25.7	3.2
Oregon	6	57	405	14.1	15	18	178	10.1	4.0
Maryland	7	64	596	10.7	27	35	557	6.3	4.4
New York	4	23	128	11.7	20	4	69	5.8	5.9
California	9	92	577	15.9	10	15	184	8.2	7.7
Minnesota	10	140	684	20.5	25	55	435	12.6	7.9
Connecticut	7	58	287	20.2	32	65	624	10.4	9.8
Total	61	737	3,942	18.7	199	512	3,337	15.3	Median: 5.15

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