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Dendrogram of optochin-resistant pneumococci. I, subpopulation isolated from the inhibition zone close to the optochin disk; O, subpopulation isolated from the farthest zone from the halo; NT, nontypeable; PG, penicillin; Ery, erythromycin; Da, clindamycin; Tet, tetracycline; SXT, trimethoprim-sulfamethoxazole; Chl, chloramphenicol.
