Document Detail

Antimicrobial susceptibility profiles of oropharyngeal viridans group streptococci isolates from cystic fibrosis and non-cystic fibrosis patients.
MedLine Citation:
PMID:  9650999     Owner:  NLM     Status:  MEDLINE    
The antimicrobial susceptibility profile of 77 oropharyngeal viridans streptococci isolates from 34 cystic fibrosis (CF) patients and 58 isolates from 43 healthy non-CF patients were studied by the E-test and the standard disk diffusion methods. Overall penicillin and cefotaxime resistances (intermediate plus resistant isolates) were significantly higher (p < 0.05) among CF isolates (72.7% and 45.5%, respectively) than among non-CF isolates (51.7% and 15.5%, respectively). No significant difference was observed in overall (intermediate plus resistant) erythromycin resistance rates, although high-level erythromycin resistance (> or =32 microg/mL) was more frequently found in CF isolates (24.6%) than in non-CF isolates (12.1%). An unexpected high percentage of isolates showed low level erythromycin resistance (MIC range, 0.5-15 microg/mL): 41.5% in cystic fibrosis and 46.5% in non-CF isolates. No significant differences were observed regarding the percentage of colonized patients with at least one penicillin-resistant isolate. On the contrary, colonization with cefotaxime (p < 0.001) or erythromycin (p = 0.014) resistant isolates were significantly more prevalent in CF patients. Similar tetracycline and chloramphenicol resistance rates were observed for both groups. Viridans isolates resistant to a single antibiotic were more prevalent among non-CF patients and multiple resistance was higher among CF patients. Prior antibiotic exposure could result in differences in beta-lactam resistance and colonization rates with resistant isolates between both groups. None of the non-CF patients was previously treated with antimicrobials for a period of three months before sampling. In contrast, 94.1% of CF patients were treated with antimicrobials within the same period; 65.6% with beta-lactam antibiotics. Patients with CF disease, frequently exposed to antimicrobials, may be a reservoir of viridans streptococci isolates with resistance determinants, particularly to beta-lactam antibiotics.
M Alvarez; M E Alvarez; L Máiz; A Asensio; F Baquero; R Canton
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Microbial drug resistance (Larchmont, N.Y.)     Volume:  4     ISSN:  1076-6294     ISO Abbreviation:  Microb. Drug Resist.     Publication Date:  1998  
Date Detail:
Created Date:  1998-09-16     Completed Date:  1998-09-16     Revised Date:  2004-11-17    
Medline Journal Info:
Nlm Unique ID:  9508567     Medline TA:  Microb Drug Resist     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  123-8     Citation Subset:  IM    
Servicio de Microbiología, Hospital Ramón y Cajal, Madrid, Spain.
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MeSH Terms
Anti-Bacterial Agents / pharmacology
Child, Preschool
Cohort Studies
Cystic Fibrosis / microbiology*
Drug Resistance, Microbial*
Microbial Sensitivity Tests
Oropharynx / microbiology*
Streptococcus / drug effects*,  isolation & purification
Reg. No./Substance:
0/Anti-Bacterial Agents

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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