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Three multiresistant serotype 6B Streptococcus pneumoniae strains were isolated from the middle ear fluids of children undergoing tympanostomy in Atlanta. Because multiresistant 6B pneumococci have been reported to spread from a single clone, the three isolates were compared with 13 other multiresistant 6B pneumococci by hybridization of endonuclease-restricted DNA fragments with a digoxigenin-labeled cDNA probe complementary to 16 and 23S rRNAs (ribotyping). The ear isolates were heterogeneous, whereas six of the other pneumococcal isolates were alike, indicating a need for additional studies to determine the possibility of clonal spread.

Heterogeneity of rRNA gene restriction patterns of multiresistant serotype 6B Streptococcus pneumoniae strains