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Figure 1. Middle ear isolates from rural Kentucky children with acute otitis media, 1992 to 1994 (N=283). Plus sign indicates
-lactamase positive; minus sign,
-lactamase negative; asterisk, minimum inhibitory concentration (MIC)
2.0 µg/mL; dagger, MIC >0.06-1.0 µg/mL; and double dagger, MIC
0.06 µg/mL (reproduced from Block et al,3 with permission).