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Mechanisms of Resistance

Increase in Quinolone Resistance in aHaemophilus influenzae Strain Isolated from a Patient with Recurrent Respiratory Infections Treated with Ofloxacin

Jordi Vila, Joaquim Ruiz, Ferran Sanchez, Ferran Navarro, Beatriz Mirelis, M. Teresa Jimenez de Anta, Guillem Prats
Jordi Vila
Departament de Microbiologia, Institut de Investigació Biomédica August Pi i Sunyer, Hospital Clı́nic, Facultat de Medicina, Universitat de Barcelona, 08036 Barcelona, and
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Joaquim Ruiz
Departament de Microbiologia, Institut de Investigació Biomédica August Pi i Sunyer, Hospital Clı́nic, Facultat de Medicina, Universitat de Barcelona, 08036 Barcelona, and
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Ferran Sanchez
Departament de Genètica i Microbiologia, Universitat Autonoma de Barcelona, Hospital de Sant Pau, 08025 Barcelona, Spain
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Ferran Navarro
Departament de Genètica i Microbiologia, Universitat Autonoma de Barcelona, Hospital de Sant Pau, 08025 Barcelona, Spain
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Beatriz Mirelis
Departament de Genètica i Microbiologia, Universitat Autonoma de Barcelona, Hospital de Sant Pau, 08025 Barcelona, Spain
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M. Teresa Jimenez de Anta
Departament de Microbiologia, Institut de Investigació Biomédica August Pi i Sunyer, Hospital Clı́nic, Facultat de Medicina, Universitat de Barcelona, 08036 Barcelona, and
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Guillem Prats
Departament de Genètica i Microbiologia, Universitat Autonoma de Barcelona, Hospital de Sant Pau, 08025 Barcelona, Spain
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DOI: 10.1128/AAC.43.1.161
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    Fig. 1.

    Molecular typing of H. influenzae strains by PFGE. Lanes 1, 2, and 10 are molecular weight markers. Lanes 3, 4, and 5 are isolates 1, 2, and 3 of this study, respectively. Lanes 6, 7, 8, and 9 are different strains of H. influenzae chosen randomly.

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  • Table 1.

    Mutations in the gyrA and parCgenes of different isolates of H. influenzae

    StrainMIC of ciprofloxacin (μg/ml)Amino acid change
    GyrAParC
    Wild typeaSer-84Asp-88Asp-83Ser-84Glu-88
    Isolate 12LeuAlaAsn
    Isolate 22LeuAlaAsn
    Isolate 332LeuAlaAsnArg
    • ↵a The wild type was a quinolone-susceptible clinical strain isolated from a sputum sample from another patient.

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Increase in Quinolone Resistance in aHaemophilus influenzae Strain Isolated from a Patient with Recurrent Respiratory Infections Treated with Ofloxacin
Jordi Vila, Joaquim Ruiz, Ferran Sanchez, Ferran Navarro, Beatriz Mirelis, M. Teresa Jimenez de Anta, Guillem Prats
Antimicrobial Agents and Chemotherapy Jan 1999, 43 (1) 161-162; DOI: 10.1128/AAC.43.1.161

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Increase in Quinolone Resistance in aHaemophilus influenzae Strain Isolated from a Patient with Recurrent Respiratory Infections Treated with Ofloxacin
Jordi Vila, Joaquim Ruiz, Ferran Sanchez, Ferran Navarro, Beatriz Mirelis, M. Teresa Jimenez de Anta, Guillem Prats
Antimicrobial Agents and Chemotherapy Jan 1999, 43 (1) 161-162; DOI: 10.1128/AAC.43.1.161
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KEYWORDS

anti-infective agents
Haemophilus Infections
Haemophilus influenzae
ofloxacin
respiratory tract infections

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