An internationally spread clone of Streptococcus pneumoniae evolves from low-level to higher-level penicillin resistance by uptake of penicillin-binding protein gene fragments from nonencapsulated pneumococci.

Hauser, Christoph; Aebi, Suzanne; Mühlemann, Kathrin (2004). An internationally spread clone of Streptococcus pneumoniae evolves from low-level to higher-level penicillin resistance by uptake of penicillin-binding protein gene fragments from nonencapsulated pneumococci. Antimicrobial agents and chemotherapy, 48(9), pp. 3563-3566. American Society for Microbiology 10.1128/AAC.48.9.3563-3566.2004

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Low-level penicillin resistance in an international Streptococcus pneumoniae serotype 19F clone emerging in Switzerland was characterized by mutations in the penicillin-binding protein PBP2x. Some isolates of this clone had evolved to higher resistance levels (penicillin MICs of 0.094 and 1 microg/ml), probably by acquisition of pbp2x fragments from local nonencapsulated pneumococci.

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