The genetic relatedness of French isolates of Streptococcus pneumoniae highly resistant to amoxicillin (MIC, >/=4 microg/ml, equal to or exceeding those of penicillin) was investigated by molecular fingerprinting. The results suggest that high-level resistance to amoxicillin has emerged within preexisting penicillin-resistant clones.
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Doit et al. (1999) studied this question.
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