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00925njm 22002777a 4500 dc Rodríguez-Avial Infante, Iciar author Ramos, Belén author Ríos Dueñas, Esther author Cercenado Mansilla, Emilia author Ordobás, María author Sanz Fernández, Juan Carlos author 2011-04-28 Among 1,349 Streptococcus pneumoniae invasive isolates, 45 (3.3%) were levofloxacin resistant. Serotype distribution was as follows: 8 (n = 32 isolates), 19A (n = 4 isolates), 7F (n = 3 isolates), 9V (n = 2 isolates), 10A (n = 1 isolate), 19F (n = 1 isolate), 6B (n = 1 isolate), and nontypeable (n = 1 isolate). Levofloxacin-resistant isolates had dual mutations in the gyrA and parC genes. Serotype 8 strains corresponded to a capsular switching of the Sweden15A-25 clone. Levofloxacin resistance was also detected among multiresistant (ST27619A, Spain9V-ST156, ST8819F, and ST15426B) and among usually antibiotic-susceptible (Netherlands7F-ST191, ST120119A, and ST263910A) clones. Rodríguez-Avial IRamos B, Ríos E, Cercenado EOrdobás M, Sanz JC, 2011. Clonal Spread of Levofloxacin-Resistant Streptococcus pneumoniae Invasive Isolates in Madrid, Spain, 2007 to 2009. Antimicrob Agents Chemother 55:. https://doi.org/10.1128/aac.01380-10 0066-4804 10.1128/AAC.01380-10 https://hdl.handle.net/20.500.14352/112751 1098-6596 https://doi.org/10.1128/aac.01380-10 https://journals.asm.org/doi/10.1128/aac.01380-10 Clonal Spread of Levofloxacin-Resistant Streptococcus pneumoniae Invasive Isolates in Madrid, Spain, 2007 to 2009